The Experts below are selected from a list of 5880 Experts worldwide ranked by ideXlab platform

Guoqing Jiang - One of the best experts on this subject based on the ideXlab platform.

  • influence of ground granulated blast furnace slag on Cracking potential of high performance concrete at early Age
    Construction and Building Materials, 2020
    Co-Authors: Dejian Shen, Shuaishuai Zhu, Yang Jiao, Yan Gao, Guoqing Jiang
    Abstract:

    Abstract In recent years, high performance concrete (HPC) has been fully developed and put into widespread use in the actual project. Ground granulated blast furnace slag (GGBFS) has been widely used in HPC as a mineral admixture to improve the comprehensive workability. Nowadays, Temperature Stress Test Machine (TSTM) has been used to investigate the Cracking potential of concrete. The influence of GGBFS on the early-Age Cracking potential of HPC has been investigated. However, investigations on the influence of GGBFS on the early-Age Cracking potential of HPC under adiabatic condition at full uniaxial restraint degree by using TSTM remain lacking. Investigations on the early-Age Cracking potential of HPC with different GGBFS contents (0%, 20%, 35%, and 50%) under adiabatic condition at full uniaxial restraint degree by using TSTM were conducted in the present study. The experimental results and related analysis indicated that (1) the addition of GGBFS reduced early-Age temperature rise, temperature drop, Cracking stress, Cracking temperature, and stress reserve of HPC; (2) the autogenous shrinkAge and integrated criterion of HPC increased with the increasing GGBFS content at early Age; (3) the early-Age Cracking potential of HPC increased with the increasing GGBFS content, and the optimal GGBFS content shall not exceed 20% in the present study.

  • influence of barchip fiber length on early Age behavior and Cracking resistance of concrete internally cured with super absorbent polymers
    Construction and Building Materials, 2019
    Co-Authors: Dejian Shen, Ci Liu, Xiaoguang Zhao, Guoqing Jiang
    Abstract:

    Abstract High performance concrete (HPC) has been applied in practical engineering for a wide range owing to its superior performances, including low permeability, high strength, high modulus, and other superior performance. However, with the high internal temperature and self-desiccation that induced by the low water-to-binder (w/b) ratio, HPC suffers high autogenous shrinkAge, which leads to the premature Cracking of HPC after peak stress at early Age. For the purpose of increasing the Cracking resistance of concrete effectively, Barchip fibers and the internal curing materials are used to improve the early-Age properties of concrete. Although researches on the Cracking resistance of HPC reinforced with different contents of Barchip fiber or internally cured with different kinds of internal curing materials have been conducted, studies on the effect of Barchip fiber length on the Cracking resistance of internally cured HPC (ICHPC) with super absorbent polymers (SAPs) at early Age are rather lacking. In present research, the effect of length of Barchip fibers (0, 42, 54, and 60 mm) on the early-Age Cracking resistance of ICHPC under the adiabatic condition was studied by Temperature Stress Test Machine. Results of the experimental research and related analysis indicated that (1) the splitting tensile strength and compressive strength of HPC increased as the Barchip fibers were applied; (2) the use of SAPs reduced autogenous shrinkAge, restrained tensile stress rate, and tensile creep behavior, and increased temperature drop and the Cracking resistance of HPC at early Age; (3) the autogenous shrinkAge decreased and the temperature drop, Cracking Age, Cracking stress of ICHPC increased as the Barchip fiber length increased; (4) the tensile creep behavior of ICHPC increased as the Barchip fibers were applied, and decreased as the Barchip fiber length increased; (5) the Cracking resistance of ICHPC increased first and then decreased as the Barchip fiber length increased, as obtained from the integrated criterion; (6) the poor dispersion of Barchip fibers may result in the decrease of the early Age behavior and Cracking resistance of ICHPC when the fiber length exceeded 54 mm.

  • Influence of Barchip fiber on early-Age Cracking potential of high performance concrete under restrained condition
    Construction and Building Materials, 2018
    Co-Authors: Dejian Shen, Wang Wenting, Liu Jiwei, Xiaoguang Zhao, Guoqing Jiang
    Abstract:

    Abstract High performance concrete (HPC), which is a new-tech concrete, has been widely applied for its good workability, lasting durability, low permeability, and high strength. However, the high temperature rise and high autogenous shrinkAge induced by the low water-to-cement (w/c) ratio would increase the early-Age Cracking potential in HPC. In order to reduce the Cracking potential of HPC, Barchip fibers are applied to strengthen the early-Age properties. Although the influence of Barchip fibers on the mechanical properties of concrete has been studied, investigations on the influence of Barchip fibers on the early-Age Cracking potential of HPC under adiabatic condition at uniaxial constant restraint degree are still lacking. The early-Age Cracking potential of HPC reinforced with different amounts of Barchip fibers (0, 4, 8, and 12 kg/m3) was tested by Temperature Stress Test Machine under adiabatic condition at full restraint degree in present study. Test results and corresponding analysis indicated that (1) the compressive strength and splitting tensile strength were enhanced by the addition of Barchip fibers in HPC; (2) Barchip fibers reduced autogenous shrinkAge, restrained tensile stress rate and increased Cracking Age, specific tensile creep of early-Age HPC; (3) the integrated criterion utilized to evaluate the Cracking potential decreased first and then increased with increasing amount of Barchip fibers; (4) the optimal Barchip fiber amount of 8 kg/m3 was recommended for that poor dispersion and fiber clumping may occur in HPC with excessive addition of Barchip fibers.

  • effect of internal curing with super absorbent polymers on residual stress development and stress relaxation in restrained concrete ring specimens
    Construction and Building Materials, 2016
    Co-Authors: Dejian Shen, Huafeng Shi, Xiaojian Tang, Guoqing Jiang
    Abstract:

    Abstract The early Age Cracking of concrete is a persistent problem for structures. Internal curing was developed to mitigate the shrinkAge of low w/c concrete in recent decades by introducing additional water into concrete. Although shrinkAge development and the early Age Cracking resistance of internally cured concrete under restraint were investigated, result on stress relaxation of internally cured concrete with super absorbent polymers (SAPs) by ring test is still lacking. Tests on the Cracking resistance of concrete with different amounts of SAPs (0%, 0.05%, 0.16%, and 0.26% by weight of cement) were conducted using restrained ring test in present study. Test results showed that: (1) the strain in the restrained steel ring decreased with the increase of amount of SAPs; (2) the residual stress of concrete ring decreased with the increase of amount of SAPs; (3) the stress rate decreased with the increase of amount of SAPs; (4) the relaxed stress increased with the increase of amount of SAPs after the initiation of drying; and (5) the time to Cracking for concrete increased with the increase of amount of SAPs.

Dejian Shen - One of the best experts on this subject based on the ideXlab platform.

  • influence of ground granulated blast furnace slag on Cracking potential of high performance concrete at early Age
    Construction and Building Materials, 2020
    Co-Authors: Dejian Shen, Shuaishuai Zhu, Yang Jiao, Yan Gao, Guoqing Jiang
    Abstract:

    Abstract In recent years, high performance concrete (HPC) has been fully developed and put into widespread use in the actual project. Ground granulated blast furnace slag (GGBFS) has been widely used in HPC as a mineral admixture to improve the comprehensive workability. Nowadays, Temperature Stress Test Machine (TSTM) has been used to investigate the Cracking potential of concrete. The influence of GGBFS on the early-Age Cracking potential of HPC has been investigated. However, investigations on the influence of GGBFS on the early-Age Cracking potential of HPC under adiabatic condition at full uniaxial restraint degree by using TSTM remain lacking. Investigations on the early-Age Cracking potential of HPC with different GGBFS contents (0%, 20%, 35%, and 50%) under adiabatic condition at full uniaxial restraint degree by using TSTM were conducted in the present study. The experimental results and related analysis indicated that (1) the addition of GGBFS reduced early-Age temperature rise, temperature drop, Cracking stress, Cracking temperature, and stress reserve of HPC; (2) the autogenous shrinkAge and integrated criterion of HPC increased with the increasing GGBFS content at early Age; (3) the early-Age Cracking potential of HPC increased with the increasing GGBFS content, and the optimal GGBFS content shall not exceed 20% in the present study.

  • influence of ground granulated blast furnace slag on early Age Cracking potential of internally cured high performance concrete
    Construction and Building Materials, 2020
    Co-Authors: Dejian Shen, Zhizhuo Feng, Yang Jiao, Jiacheng Kang, Yongqiang Shen
    Abstract:

    Abstract High performance concrete (HPC) with low water-to-binder ( w / b ) ratio has been used widely in the actual project. However, high autogenous shrinkAge induced by the low w / b ratio would cause the residual tensile stress in HPC when the shrinkAge is restrained. The Cracking may occur in HPC if the residual tensile stress exceeds the developing tensile strength. Ground granulated blast furnace slag (GGBFS) has been used widely in the mixture of HPC as a kind of mineral admixture. The influence of GGBFS on the Cracking potential of concrete has been studied. However, investigations on the influence of GGBFS on the early-Age Cracking potential of internally cured high performance concrete (ICC) with super absorbent polymers (SAPs) as an internal curing (IC) Agent by using the ring test are still lacking. Investigations on the early-Age Cracking potential of ICC with different GGBFS contents (0%, 20%, 35%, and 50%) by using the ring test were conducted in the present study. Results and corresponding analysis showed that: (1) the free shrinkAge strain, residual tensile stress, stress relaxation, Cracking potential parameter, and stress rate of ICC with SAPs decreased with the increase of GGBFS content; (2) the early-Age Cracking potential of ICC with SAPs based on the Cracking potential parameter and stress rate decreased with the increase of GGBFS content. The results in the present study could be used to evaluate the influence of GGBFS on the early-Age Cracking potential of ICC with SAPs.

  • influence of barchip fiber length on early Age behavior and Cracking resistance of concrete internally cured with super absorbent polymers
    Construction and Building Materials, 2019
    Co-Authors: Dejian Shen, Ci Liu, Xiaoguang Zhao, Guoqing Jiang
    Abstract:

    Abstract High performance concrete (HPC) has been applied in practical engineering for a wide range owing to its superior performances, including low permeability, high strength, high modulus, and other superior performance. However, with the high internal temperature and self-desiccation that induced by the low water-to-binder (w/b) ratio, HPC suffers high autogenous shrinkAge, which leads to the premature Cracking of HPC after peak stress at early Age. For the purpose of increasing the Cracking resistance of concrete effectively, Barchip fibers and the internal curing materials are used to improve the early-Age properties of concrete. Although researches on the Cracking resistance of HPC reinforced with different contents of Barchip fiber or internally cured with different kinds of internal curing materials have been conducted, studies on the effect of Barchip fiber length on the Cracking resistance of internally cured HPC (ICHPC) with super absorbent polymers (SAPs) at early Age are rather lacking. In present research, the effect of length of Barchip fibers (0, 42, 54, and 60 mm) on the early-Age Cracking resistance of ICHPC under the adiabatic condition was studied by Temperature Stress Test Machine. Results of the experimental research and related analysis indicated that (1) the splitting tensile strength and compressive strength of HPC increased as the Barchip fibers were applied; (2) the use of SAPs reduced autogenous shrinkAge, restrained tensile stress rate, and tensile creep behavior, and increased temperature drop and the Cracking resistance of HPC at early Age; (3) the autogenous shrinkAge decreased and the temperature drop, Cracking Age, Cracking stress of ICHPC increased as the Barchip fiber length increased; (4) the tensile creep behavior of ICHPC increased as the Barchip fibers were applied, and decreased as the Barchip fiber length increased; (5) the Cracking resistance of ICHPC increased first and then decreased as the Barchip fiber length increased, as obtained from the integrated criterion; (6) the poor dispersion of Barchip fibers may result in the decrease of the early Age behavior and Cracking resistance of ICHPC when the fiber length exceeded 54 mm.

  • Influence of Barchip fiber on early-Age Cracking potential of high performance concrete under restrained condition
    Construction and Building Materials, 2018
    Co-Authors: Dejian Shen, Wang Wenting, Liu Jiwei, Xiaoguang Zhao, Guoqing Jiang
    Abstract:

    Abstract High performance concrete (HPC), which is a new-tech concrete, has been widely applied for its good workability, lasting durability, low permeability, and high strength. However, the high temperature rise and high autogenous shrinkAge induced by the low water-to-cement (w/c) ratio would increase the early-Age Cracking potential in HPC. In order to reduce the Cracking potential of HPC, Barchip fibers are applied to strengthen the early-Age properties. Although the influence of Barchip fibers on the mechanical properties of concrete has been studied, investigations on the influence of Barchip fibers on the early-Age Cracking potential of HPC under adiabatic condition at uniaxial constant restraint degree are still lacking. The early-Age Cracking potential of HPC reinforced with different amounts of Barchip fibers (0, 4, 8, and 12 kg/m3) was tested by Temperature Stress Test Machine under adiabatic condition at full restraint degree in present study. Test results and corresponding analysis indicated that (1) the compressive strength and splitting tensile strength were enhanced by the addition of Barchip fibers in HPC; (2) Barchip fibers reduced autogenous shrinkAge, restrained tensile stress rate and increased Cracking Age, specific tensile creep of early-Age HPC; (3) the integrated criterion utilized to evaluate the Cracking potential decreased first and then increased with increasing amount of Barchip fibers; (4) the optimal Barchip fiber amount of 8 kg/m3 was recommended for that poor dispersion and fiber clumping may occur in HPC with excessive addition of Barchip fibers.

  • effect of internal curing with super absorbent polymers on residual stress development and stress relaxation in restrained concrete ring specimens
    Construction and Building Materials, 2016
    Co-Authors: Dejian Shen, Huafeng Shi, Xiaojian Tang, Guoqing Jiang
    Abstract:

    Abstract The early Age Cracking of concrete is a persistent problem for structures. Internal curing was developed to mitigate the shrinkAge of low w/c concrete in recent decades by introducing additional water into concrete. Although shrinkAge development and the early Age Cracking resistance of internally cured concrete under restraint were investigated, result on stress relaxation of internally cured concrete with super absorbent polymers (SAPs) by ring test is still lacking. Tests on the Cracking resistance of concrete with different amounts of SAPs (0%, 0.05%, 0.16%, and 0.26% by weight of cement) were conducted using restrained ring test in present study. Test results showed that: (1) the strain in the restrained steel ring decreased with the increase of amount of SAPs; (2) the residual stress of concrete ring decreased with the increase of amount of SAPs; (3) the stress rate decreased with the increase of amount of SAPs; (4) the relaxed stress increased with the increase of amount of SAPs after the initiation of drying; and (5) the time to Cracking for concrete increased with the increase of amount of SAPs.

Jason Weiss - One of the best experts on this subject based on the ideXlab platform.

  • Early Age Cracking behavior of internally cured mortar restrained by dual rings with different thickness
    Construction and Building Materials, 2014
    Co-Authors: Dinghua Zou, Jason Weiss
    Abstract:

    Abstract This paper presents the results of research which examined the early Age Cracking behavior of internally cured and plain mortars under restraint. Residual stress development, Cracking stress and Age of internally cured and plain mortars restrained by dual rings with different thickness were studied in detail. Tensile stress resistance was calculated according to the results of fracture test. Autogenous volume deformation was tested also. The obtained results reveal that, internally cured and plain mortars are unlike to crack at first 2 days due to the low residual stress. After that Age, residual stress in plain mortar goes up quickly and induces the damAge of material, which implies the higher possibility to crack with the past of Age. Compared to plain mortar, lower shrinkAge or expansion, lower elastic modulus and less damAge are advantAges of internally cured mortar to diminish the risk of Cracking.

  • The influence of the initial moisture content of lightweight aggregate on internal curing
    Construction and Building Materials, 2012
    Co-Authors: Michael Golias, Javier Castro, Jason Weiss
    Abstract:

    This paper explores the potential for manufacturing internally cured concretes with lightweight aggregate (LWA) that has different initial moisture contents prior to mixing: oven-dry, 24 h pre-wetted, and vacuum saturated. Results show that when LWA is used in an oven-dry condition it can absorb water from the paste prior to set which will be returned to the system as internal curing water. When mixture proportion adjustments are properly made to account for the water absorbed by the aggregate before setting, the mixture can provide internal curing benefits. These beneficial aspects include increased hydration which leads to higher compressive strength, reduced water absorption, and reduced electrical conductivity (permeability). Further, these benefits include reduced autogenous shrinkAge and a lower propensity for early-Age Cracking.

  • water absorption in internally cured mortar made with water filled lightweight aggregate
    Cement and Concrete Research, 2009
    Co-Authors: Ryan Henkensiefken, Dale P. Bentz, Javier Castro, Tommy Nantung, Jason Weiss
    Abstract:

    The increased propensity for shrinkAge Cracking in low water-to-cement ratio (w/c) concrete has inspired the development of new technologies that can reduce the risk of early-Age Cracking. One of these is internal curing. Internal curing uses saturated lightweight aggregate to supply 'curing water' to low w/c paste as it hydrates. Significant research has been performed to determine the effects of internal curing on shrinkAge and stress development; however, relatively little detailed information exists about the effects of internal curing on fluid transport properties such as water absorption or diffusivity. This study examines the absorption of water into mortar specimens made with saturated lightweight aggregates (SLWA). These results indicate that the inclusion of SLWA can reduce the water absorption of mortar specimens. This observation was reinforced with electrical conductivity measurements that exhibited similar reductions.

  • early Age properties of cement based materials i influence of cement fineness
    Journal of Materials in Civil Engineering, 2008
    Co-Authors: Gaurav Sant, Jason Weiss, Dale P. Bentz
    Abstract:

    The influence of cement fineness on early-Age properties of cement-based materials is investigated using a variety of experimental techniques. Properties that are critical to the early-Age performance of these materials are tested, including heat release, temperature rise, chemical shrinkAge, and autogenous deformation. Measurements of these properties for two cements of widely different fineness are supplemented with other performance measures, specifically acoustic emission measurements to listen for microCracking occurring in high performance w/c=0.35 mortars and dual-ring paste shrinkAge measurements conducted under sealed conditions to assess residual stress development. The measured properties are observed to be quite different for the coarse and the fine cement. The current emphasis on high early-Age strength within the construction industry may result in the specification of cements that are more prone to early-Age Cracking.

  • the role of specimen geometry and boundary conditions on stress development and Cracking in the restrained ring test
    Cement and Concrete Research, 2006
    Co-Authors: Akhter B. Hossain, Jason Weiss
    Abstract:

    Early-Age Cracking can be a significant problem in concrete pavements, floors, and bridge decks. Various test methods have been developed to assess the potential for early-Age Cracking, however due to the economy and simplicity of the ring test, it has become widely used. Although the ring test procedures employed by various authors are similar, they vary in terms of curing duration, specimen geometry, and boundary conditions. This paper describes an experimental study of restrained ring specimens tested using different geometries and boundary conditions. Specimen geometry was found to have a significant effect on the stress development and Age of Cracking in the restrained ring specimens. Specimens that shrink uniformly along the radius show the greatest variation in the Age of Cracking with thicker specimens Cracking at a later Age. Acoustic emission testing has been used to illustrate that specimen boundary condition substantially influence crack development and propagation in the restrained rings.

Yongqiang Shen - One of the best experts on this subject based on the ideXlab platform.

  • influence of ground granulated blast furnace slag on early Age Cracking potential of internally cured high performance concrete
    Construction and Building Materials, 2020
    Co-Authors: Dejian Shen, Zhizhuo Feng, Yang Jiao, Jiacheng Kang, Yongqiang Shen
    Abstract:

    Abstract High performance concrete (HPC) with low water-to-binder ( w / b ) ratio has been used widely in the actual project. However, high autogenous shrinkAge induced by the low w / b ratio would cause the residual tensile stress in HPC when the shrinkAge is restrained. The Cracking may occur in HPC if the residual tensile stress exceeds the developing tensile strength. Ground granulated blast furnace slag (GGBFS) has been used widely in the mixture of HPC as a kind of mineral admixture. The influence of GGBFS on the Cracking potential of concrete has been studied. However, investigations on the influence of GGBFS on the early-Age Cracking potential of internally cured high performance concrete (ICC) with super absorbent polymers (SAPs) as an internal curing (IC) Agent by using the ring test are still lacking. Investigations on the early-Age Cracking potential of ICC with different GGBFS contents (0%, 20%, 35%, and 50%) by using the ring test were conducted in the present study. Results and corresponding analysis showed that: (1) the free shrinkAge strain, residual tensile stress, stress relaxation, Cracking potential parameter, and stress rate of ICC with SAPs decreased with the increase of GGBFS content; (2) the early-Age Cracking potential of ICC with SAPs based on the Cracking potential parameter and stress rate decreased with the increase of GGBFS content. The results in the present study could be used to evaluate the influence of GGBFS on the early-Age Cracking potential of ICC with SAPs.

  • early Age Cracking resistance of ground granulated blast furnace slag concrete
    Construction and Building Materials, 2019
    Co-Authors: Kaiqi Liu, Chuyuan Wen, Yongqiang Shen
    Abstract:

    Abstract High-performance concrete (HPC) generally experiences rather high autogenous shrinkAge. If restrained, residual tensile stress will be induced which may be sufficient to cause Cracking. Ground granulated blast furnace slag (GGBFS) has been utilized as a mineral admixture to reduce shrinkAge Cracking in HPC. The restrained shrinkAge Cracking of concrete containing GGBFS appears to be less than that of concrete without slag. However, the data is limited, and the effect of the GGBFS on the restrained Cracking resistance needs to be further investigated. Restrained ring tests on Cracking resistance of HPC using GGBFS as 0%, 20%, 35%, and 50% by weight replacements of cement were performed. Four concrete mixtures with the same w/b ratio of 0.32 were placed in a 23 ± 1 °C, 60 ± 5% RH environment, and covered with vinyl and aluminum adhesive tape. The outer rings were removed at 24 h after casting to allow water evaporation through the height of the specimen. Test results showed that: (1) the residual tensile stress at the Age of 14.25 days after casting decreased by 18.6%, 33.2%, and 40.9% when the amount of GGBFS increased from 0% to 20%, 35%, and 50%, respectively; (2) the stress rate decreased by 58.9%, 62.5%, and 66.8% when the amount of GGBFS increased from 0% to 20%, 35%, and 50%, respectively, indicating that the Cracking resistance based on stress rate increased with increasing GGBFS replacement.

F Hernandezolivares - One of the best experts on this subject based on the ideXlab platform.

  • combined effect of polypropylene fibers and silica fume to improve the durability of concrete with natural pozzolans blended cement
    Construction and Building Materials, 2015
    Co-Authors: Flores N Medina, Gonzalo Barluenga, F Hernandezolivares
    Abstract:

    Abstract Early Age shrinkAge and Cracking, water permeability and carbonation depth of concretes with natural Pozzolans blended cement (NPC) were investigated in order to assess the combined effect of Polypropylene short fibers (PPF) and Silica Fume (SF) on some durability parameters. The addition of 10% of SF increased compressive strength, shrinkAge and Cracking, permeability and carbonation depth. But, the combination of 10% SF and 0.07% PPF volumetric fraction mitigated early Age Cracking and significantly reduced water permeability and carbonation depth. The use of PPF in NPC concrete combined with SF can be recommended to reduce long-term impact of early Age Cracking, and enhance durability. However, cement should not be reduced when SF is added to mixtures without PPF, because lower CaO reserves may affect final pH, leading to concretes more sensible to carbonation.

  • enhancement of durability of concrete composites containing natural pozzolans blended cement through the use of polypropylene fibers
    Composites Part B-engineering, 2014
    Co-Authors: Flores N Medina, Gonzalo Barluenga, F Hernandezolivares
    Abstract:

    Abstract A parametric experimental study of the effects of Polypropylene fibers (PPF) on early Cracking due to drying shrinkAge in concretes with Natural Pozzolan Cement (NPC) and its influence on its durability is presented. Concrete composites containing natural pozzolan (toba trachite), point shaped crushed aggregates and different fiber volume fractions of PPF (0.03%, 0.06%, 0.09%, and 0.12%) were studied. This mixture is characterized by high permeability and carbonation ranges. Early Age Cracking control ability and drying shrinkAge of PPF in NPC concretes were measured under dry setting conditions. The cracked area due to drying shrinkAge was measured to establish the positive effect of the different PPF volume fractions in concretes. Besides, bulk density and water permeability depth were determined. Finally these specimens were stored for two years and tested afterwards, measuring the natural carbonation depth. Then the Cracking area was again measured to assess the control ability of PPF on this parameter after long time. Finally a relationship of these indicators is analyzed to understand future lifespan of these concrete composites. The results indicate that a volume fraction of 0.07% of PPF reduces Cracking area due to drying shrinkAge of NPC a 66%, but larger volume fractions did not increased linearly this effect, and even worse results were obtained. The increment of PPF volume fraction reduces the water permeability depth and even the carbonation depth. A reduction of the cracked area, due to early shrinkAge, of a 66% in NPC concretes may reach in these concretes a 32% lower water permeability indicators (enclosed wet area) and a 43% shorter minimum carbonation depth attending to the results obtained. So it can be considered that the Cracking control ability of fibers on the exposed concrete surface reduced water permeability and CO 2 diffusion. However the use of fiber increased porosity and reduced bulk density and ultrasonic modulus of NPC concretes. In conclusion NPC concretes with low amounts of PP fibers (upper to 0.07% volume fraction) are less permeable and the CO 2 diffusion is slower in time due to early Age Cracking control, producing more durable concretes.