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V. Sirivivatnanon - One of the best experts on this subject based on the ideXlab platform.
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effect of carbon dioxide on Chloride Penetration and Chloride ion diffusion coefficient of blended portland cement mortar
Construction and Building Materials, 2008Co-Authors: Prinya Chindaprasirt, Sumrerng Rukzon, V. SirivivatnanonAbstract:This paper presents a study of the effects of carbon dioxide on Chloride Penetration and Chloride ion diffusion coefficient of blended Portland cement mortar containing ground palm oil fuel ash (POA), ground rice husk ash (RHA) and classified fly ash (fine fly ash, FA). Ordinary Portland cement (OPC) is partially replaced with pozzolan and blends of pozzolans. Mortars with constant water to cement ratio and similar flow were used for the tests. This research used accelerated testing environment with 5% CO2. Rapid Chloride Penetration test (RCPT), modified rapid migration test (MRMT) and Chloride Penetration depth after 30 days of immersion in 3% NaCl solution of mortars were determined on the mortars with and without exposure to carbon dioxide environment. For OPC mortar, the exposure to carbon dioxide environment does not lower the Chloride Penetration resistance of mortar as measured by RCPT, MRMT and NaCl immersion test. However, the exposure to carbon dioxide significantly decreases the Chloride Penetration resistance of mortar containing pozzolans. This decrease is related to the replacement level of pozzolans.
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resistance to Chloride Penetration of blended portland cement mortar containing palm oil fuel ash rice husk ash and fly ash
Construction and Building Materials, 2008Co-Authors: Prinya Chindaprasirt, Sumrerng Rukzon, V. SirivivatnanonAbstract:Abstract This paper presents a study of the resistance to Chloride Penetration of blended Portland cement mortar containing ground palm oil fuel ash (POA), ground rice husk ash (RHA) and fine fly ash (FA). Ordinary Portland cement (OPC) is partially replaced with pozzolan at the dosages of 20% and 40% by weight of cementitious materials. The water to cement ratio is kept constant at 0.5 and the flow of mortar is maintained at 110 ± 5% with the aid of superplasticizer (SP). Compressive strength, rapid Chloride Penetration test (RCPT), rapid migration test (RMT) and Chloride Penetration depth after 30 days of immersion in 3% NaCl solution of mortars were determined. Test results reveal that the resistance to Chloride Penetration of mortar improves substantially with partial replacement of OPC with POA, RHA and FA. The resistance is higher with an increase in the replacement level. RHA is found to be the most effective pozzolan followed by POA and FA. The use of FA reduces the amount of SP required to maintain the mortar flow, while the incorporations of POA and RHA require more SP. The use of a blend of equal weight portion of POA and FA, or RHA and FA produces mixes with good strength and resistance to Chloride Penetration. They also require less amount of SP in comparison to that of normal OPC mortar.
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CHARACTERISING Chloride Penetration RESISTANCE OF CONCRETE Chloride Penetration resistance of concrete
1999Co-Authors: V. SirivivatnanonAbstract:Concrete in coastal and marine environments can be subjected to a number of deterioration mechanisms. They include carbonation and/or Chloride-induced steel corrosion and sulphate attack. Recent emphasis has been given to the premature deterioration caused by steel corrosion. Performance requirements are generally based on factors that reflect the resistance of concrete to Chloride Penetration. The interactions between different deterioration mechanisms are discussed. In most cases, Chloride-induced corrosion is believed to be the prime deterioration mechanism. This is because conditions, that favour a rapid carbonation and Chloride Penetration, rarely coexist. The expansion of concrete by sulphate ions in seawater is retarded owing to the concomitant presence of Chlorides. A number of established and emerging methods used in comparing the resistance of concrete to Chloride Penetration are discussed. It has been found that there are great limitations on the suitability of a range of indirect methods used. The merits of assessing the Chloride Penetration profile, diffusion coefficient, and accelerated methods based on the ASTM C1202 and its modification are presented. Australian data presented clearly highlight the benefits of the use of a range of supplementary cementing materials (SCM) in improving the resistance of concretes to Chloride Penetration.
Prinya Chindaprasirt - One of the best experts on this subject based on the ideXlab platform.
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Strength and Chloride Penetration of Portland cement mortar containing palm oil fuel ash and ground river sand
Computers & concrete, 2009Co-Authors: Prinya Chindaprasirt, Sumrerng RukzonAbstract:This paper presents a study of the strength and Chloride Penetration of blended Portland cement mortar containing ground palm oil fuel ash (POA) and ground river sand (GS). Ordinary Portland cement (OPC) was partially replaced with POA and GS. Compressive strength, rapid Chloride Penetration test (RCPT) and Chloride Penetration depth of mortars were determined. The GS only asserted the packing effect and its incorporation reduced the strength and the resistance to Chloride Penetration of mortar. The POA asserted both packing and pozzolanic effects. The use of the blend of equal portion of POA and GS also produced high strength mortars, save cost and excellent resistance to Chloride Penetration owing to the synergic effect of the blend of POA and GS. For Chloride depth, the mathematical model correlates well with the experimental results. The computer graphics of Chloride depth of the ternary blended mortars are also constructed and can be used to aid the understanding and the proportioning of the blended system.
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effect of carbon dioxide on Chloride Penetration and Chloride ion diffusion coefficient of blended portland cement mortar
Construction and Building Materials, 2008Co-Authors: Prinya Chindaprasirt, Sumrerng Rukzon, V. SirivivatnanonAbstract:This paper presents a study of the effects of carbon dioxide on Chloride Penetration and Chloride ion diffusion coefficient of blended Portland cement mortar containing ground palm oil fuel ash (POA), ground rice husk ash (RHA) and classified fly ash (fine fly ash, FA). Ordinary Portland cement (OPC) is partially replaced with pozzolan and blends of pozzolans. Mortars with constant water to cement ratio and similar flow were used for the tests. This research used accelerated testing environment with 5% CO2. Rapid Chloride Penetration test (RCPT), modified rapid migration test (MRMT) and Chloride Penetration depth after 30 days of immersion in 3% NaCl solution of mortars were determined on the mortars with and without exposure to carbon dioxide environment. For OPC mortar, the exposure to carbon dioxide environment does not lower the Chloride Penetration resistance of mortar as measured by RCPT, MRMT and NaCl immersion test. However, the exposure to carbon dioxide significantly decreases the Chloride Penetration resistance of mortar containing pozzolans. This decrease is related to the replacement level of pozzolans.
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resistance to Chloride Penetration of blended portland cement mortar containing palm oil fuel ash rice husk ash and fly ash
Construction and Building Materials, 2008Co-Authors: Prinya Chindaprasirt, Sumrerng Rukzon, V. SirivivatnanonAbstract:Abstract This paper presents a study of the resistance to Chloride Penetration of blended Portland cement mortar containing ground palm oil fuel ash (POA), ground rice husk ash (RHA) and fine fly ash (FA). Ordinary Portland cement (OPC) is partially replaced with pozzolan at the dosages of 20% and 40% by weight of cementitious materials. The water to cement ratio is kept constant at 0.5 and the flow of mortar is maintained at 110 ± 5% with the aid of superplasticizer (SP). Compressive strength, rapid Chloride Penetration test (RCPT), rapid migration test (RMT) and Chloride Penetration depth after 30 days of immersion in 3% NaCl solution of mortars were determined. Test results reveal that the resistance to Chloride Penetration of mortar improves substantially with partial replacement of OPC with POA, RHA and FA. The resistance is higher with an increase in the replacement level. RHA is found to be the most effective pozzolan followed by POA and FA. The use of FA reduces the amount of SP required to maintain the mortar flow, while the incorporations of POA and RHA require more SP. The use of a blend of equal weight portion of POA and FA, or RHA and FA produces mixes with good strength and resistance to Chloride Penetration. They also require less amount of SP in comparison to that of normal OPC mortar.
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Influence of fly ash fineness on the Chloride Penetration of concrete
Construction and Building Materials, 2007Co-Authors: Prinya Chindaprasirt, C. Chotithanorm, H.t. Cao, Vute SirivivatnanonAbstract:Abstract In this paper, the resistance to Chloride Penetration of concrete containing fly ash of various finenesses was examined. Three different fly ash finenesses viz., original fly ash, 45% fine portion and 10% fine portion fly ashes were used for the study. Chloride resistance of concretes was evaluated using the measurement of the Coulomb charge as per ASTM C1202 and by determination of Chloride ingress after different periods of exposure to 3% NaCl solution in full immersion and partial immersion modes. From the tests, it is found that the resistance to Chloride Penetration of concrete depends on the fineness of fly ash. The rapid Chloride permeability test (ASTM C1202) clearly indicates that the Coulomb charge of concrete at the age of 28 days is significantly reduced with the incorporation of fly ash. The decrease is promoted with an increase in fly ash fineness. The immersion of cut cylinders in the 3% NaCl solution for 3 and 6 months confirm that the resistance of the Chloride Penetration of concrete increases with an incorporation with fly ash and with an increase in the fly ash fineness.
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A Study of Chloride Penetration of Concrete Containing Classified Fly Ash
2006Co-Authors: Chaicharn Chotetanorm, Bopit Bubphachot, Prinya ChindaprasirtAbstract:The objective of this research was to determine the resistance of Chloride Penetration ofconcrete containing fly ashes with different fineness. Ordinary Portland cement and three types offly ash viz., original fly ash and classified 45% and 10% fine fly ash portions were used. Thepercentage of fly ash replacement in cement was fixed at 30% for all mixes. The Coulomb chargetest in accordance with ASTM C 1202 and the Chloride immersion tests in 3% NaCl solution wereperformed for investigating the Chloride Penetration resistance of concrete. The results showed thatthe resistance of Chloride Penetration of concrete measured by the Coulomb charge increasedwhen fly ash was used in concrete and the fly ash fineness increased. The results of the Chlorideimmersion test for 3-6 months confirmed the finding. Keywords : Chloride Penetration / Coulomb Charge / Sodium Chloride Solution / ClassifiedFly Ash / Concrete
Rui V. Silva - One of the best experts on this subject based on the ideXlab platform.
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Statistical modelling of the resistance to Chloride Penetration in concrete with recycled aggregates
Construction and Building Materials, 2018Co-Authors: R. Neves, Ana Silva, Jorge De Brito, Rui V. SilvaAbstract:Abstract Steel corrosion is one of the biggest threats to the service life of reinforced concrete structures and Chloride Penetration favours the corrosion process. Due to sustainability and environmental issues, the use of recycled aggregate in concrete production has been growing. The aim of this study is to develop analytical models that allow predicting the performance of concrete incorporating recycled aggregates regarding Chloride Penetration. Multiple linear regression analysis was applied to a dataset collated from the literature. The dataset comprised 942 case studies from 33 publications. The analyses allowed identifying the explanatory variables and developing two mathematical models. One of these models is intended to predict the Chloride diffusion coefficient from accelerated non-steady state migration tests, while the other predicts the charge transfer in rapid Chloride permeability tests. The obtained correlation coefficients and analysis of variance (ANOVA) test results evidence the adequacy of both models. Thus, it is possible to estimate the resistance to Chloride Penetration in concrete incorporating recycled aggregates through the proposed models.
Sumrerng Rukzon - One of the best experts on this subject based on the ideXlab platform.
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Strength and Chloride Penetration of Portland cement mortar containing palm oil fuel ash and ground river sand
Computers & concrete, 2009Co-Authors: Prinya Chindaprasirt, Sumrerng RukzonAbstract:This paper presents a study of the strength and Chloride Penetration of blended Portland cement mortar containing ground palm oil fuel ash (POA) and ground river sand (GS). Ordinary Portland cement (OPC) was partially replaced with POA and GS. Compressive strength, rapid Chloride Penetration test (RCPT) and Chloride Penetration depth of mortars were determined. The GS only asserted the packing effect and its incorporation reduced the strength and the resistance to Chloride Penetration of mortar. The POA asserted both packing and pozzolanic effects. The use of the blend of equal portion of POA and GS also produced high strength mortars, save cost and excellent resistance to Chloride Penetration owing to the synergic effect of the blend of POA and GS. For Chloride depth, the mathematical model correlates well with the experimental results. The computer graphics of Chloride depth of the ternary blended mortars are also constructed and can be used to aid the understanding and the proportioning of the blended system.
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effect of carbon dioxide on Chloride Penetration and Chloride ion diffusion coefficient of blended portland cement mortar
Construction and Building Materials, 2008Co-Authors: Prinya Chindaprasirt, Sumrerng Rukzon, V. SirivivatnanonAbstract:This paper presents a study of the effects of carbon dioxide on Chloride Penetration and Chloride ion diffusion coefficient of blended Portland cement mortar containing ground palm oil fuel ash (POA), ground rice husk ash (RHA) and classified fly ash (fine fly ash, FA). Ordinary Portland cement (OPC) is partially replaced with pozzolan and blends of pozzolans. Mortars with constant water to cement ratio and similar flow were used for the tests. This research used accelerated testing environment with 5% CO2. Rapid Chloride Penetration test (RCPT), modified rapid migration test (MRMT) and Chloride Penetration depth after 30 days of immersion in 3% NaCl solution of mortars were determined on the mortars with and without exposure to carbon dioxide environment. For OPC mortar, the exposure to carbon dioxide environment does not lower the Chloride Penetration resistance of mortar as measured by RCPT, MRMT and NaCl immersion test. However, the exposure to carbon dioxide significantly decreases the Chloride Penetration resistance of mortar containing pozzolans. This decrease is related to the replacement level of pozzolans.
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resistance to Chloride Penetration of blended portland cement mortar containing palm oil fuel ash rice husk ash and fly ash
Construction and Building Materials, 2008Co-Authors: Prinya Chindaprasirt, Sumrerng Rukzon, V. SirivivatnanonAbstract:Abstract This paper presents a study of the resistance to Chloride Penetration of blended Portland cement mortar containing ground palm oil fuel ash (POA), ground rice husk ash (RHA) and fine fly ash (FA). Ordinary Portland cement (OPC) is partially replaced with pozzolan at the dosages of 20% and 40% by weight of cementitious materials. The water to cement ratio is kept constant at 0.5 and the flow of mortar is maintained at 110 ± 5% with the aid of superplasticizer (SP). Compressive strength, rapid Chloride Penetration test (RCPT), rapid migration test (RMT) and Chloride Penetration depth after 30 days of immersion in 3% NaCl solution of mortars were determined. Test results reveal that the resistance to Chloride Penetration of mortar improves substantially with partial replacement of OPC with POA, RHA and FA. The resistance is higher with an increase in the replacement level. RHA is found to be the most effective pozzolan followed by POA and FA. The use of FA reduces the amount of SP required to maintain the mortar flow, while the incorporations of POA and RHA require more SP. The use of a blend of equal weight portion of POA and FA, or RHA and FA produces mixes with good strength and resistance to Chloride Penetration. They also require less amount of SP in comparison to that of normal OPC mortar.
J E K Sperb - One of the best experts on this subject based on the ideXlab platform.
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Chloride Penetration and carbonation in concrete with rice husk ash and chemical activators
Cement & Concrete Composites, 2007Co-Authors: A L G Gastaldini, G C Isaia, N S Gomes, J E K SperbAbstract:The use of industrial or agricultural by-product substitutions for cement has greatly contributed to sustainable development practices. The joint use of chemical activators has produced improvements in the mechanical properties of concrete but there are still few studies attempting to investigate the influence of activators on carbonation and Chloride Penetration. This study investigated the influence of chemical activators K2SO4 ,N a 2SO4 ,N a 2SiO3 on compressive strength, Chloride Penetration and carbonation of concrete mixtures with rice husk ash. Results indicate that the use of these activators has beneficial effects on initial strength and reduces Chloride Penetration. The mixture prepared with 20% rice husk ash and 1% K2SO4 as a chemical activator showed the lowest carbonation coefficients, which were in fact lower than the values found in the reference sample. � 2006 Elsevier Ltd. All rights reserved.