The Experts below are selected from a list of 3003 Experts worldwide ranked by ideXlab platform

Ryoichi Sato - One of the best experts on this subject based on the ideXlab platform.

Guanglin Yuan - One of the best experts on this subject based on the ideXlab platform.

  • Effects of stress and high temperature on the Carbonation Resistance of fly ash concrete
    Construction and Building Materials, 2017
    Co-Authors: Wei Wang, Guanglin Yuan
    Abstract:

    Abstract In order to study the Carbonation Resistance of fly ash concrete under multi-factor coupling conditions and provide a suggestion for the design and analysis of actual projects, an experimental investigation was conducted on the effects of the compressive and tensile stress, the high exposure temperature, and the fly ash content, on the Carbonation Resistance of fly ash concrete. The process of Carbonation was accelerated by using an accelerated Carbonation chamber and the Carbonation Resistance of concrete were examined by measuring the Carbonation depth of concrete specimens. Results from the tests indicate that the Carbonation Resistance of both types of concrete decreased with an increase in tensile stress level, while with an increase in compressive stress level, the Carbonation Resistance increased first and then decreased. Compressive strength and Carbonation Resistance of concrete was markedly affected by an increase in exposure temperature; the higher the temperature, the deeper was the Carbonation depth. The combination of factors, namely, stress, high temperature and high fly ash content, will greatly reduce the Carbonation Resistance of concrete.

Surinder Singh - One of the best experts on this subject based on the ideXlab platform.

  • Carbonation Resistance of self-compacting recycled aggregate concretes with silica fume
    Journal of Sustainable Cement-Based Materials, 2018
    Co-Authors: Navdeep Singh, Surinder Singh
    Abstract:

    The paper presents the results of Carbonation Resistance of Self-Compacting Concrete (SCC) made with coarse recycled concrete aggregates and fine recycled concrete aggregates. To evaluate the carbo...

  • Evaluating the Carbonation Resistance of Self Compacting Concrete made with Recycled Concrete Aggregates
    2016
    Co-Authors: Surinder Singh, Navdeep Singh
    Abstract:

    The paper presents the results of an investigation conducted to examine Carbonation Resistance of Self Compacting Concrete (SCC) made with coarse Recycled Concrete Aggregates (RCA). In total, five SCC mixes were prepared by systematically replacing coarse Natural Aggregates (NA) by RCA at 0, 25, 50, 75 and 100%. In order to measure the Carbonation Resistance of SCC made with RCA, accelerated Carbonation tests were performed for 4 and 12 weeks of exposure to carbon dioxide. The Carbonation Resistance has been evaluated after curing periods of 28 and 90 days. In addition to this, the compressive strength of all the mixes was also obtained after 7, 28 and 90 days of curing and ultra-sonic pulse velocity tests (UPV) were also conducted. The results indicate that with the increase in the content of RCA as replacement of NA, decrease in the Carbonation Resistance, compressive strength and UPV was observed for all SCC mixes. It has been observed that the SCC mixes containing low percentages of RCA (i.e. 25%) as replacement of NA do not impart detrimental behaviour in the overall performance but higher replacement levels (>50%) have been found to deteriorate the performance in terms of Carbonation Resistance, compressive strength and UPV.

  • Carbonation Resistance and microstructural analysis of Low and High Volume Fly Ash Self Compacting Concrete containing Recycled Concrete Aggregates
    Construction and Building Materials, 2016
    Co-Authors: Navdeep Singh, Surinder Singh
    Abstract:

    Abstract The present study investigates the Carbonation Resistance of Low Volume Fly Ash (LVFA) and High Volume Fly Ash (HVFA) based Self Compacting Concrete (SCC) made with Coarse Recycled Concrete Aggregates (RCA). In order to study the Carbonation Resistance of LVFA and HVFA based SCC mixes made with RCA, accelerated Carbonation tests were conducted for an exposure period of 4, 12 and 16 weeks. The results indicate that with the increase in RCA content as replacement of Coarse Natural Aggregates (NA), decrease in the Carbonation Resistance of SCC mixes has been observed. The inclusion of metakaolin (MK) as a mineral admixture has been found to compensate the loss in the Carbonation Resistance on account of substitution of NA with RCA to some extent. The current investigation also emphasises on the microstructural study performed by Scanning Electron Microscopy (SEM) and Thermogravimetric Analysis (TGA) for validation of observed results.

Eslam M. Kamal - One of the best experts on this subject based on the ideXlab platform.

  • The role of relative humidity and cement type on Carbonation Resistance of concrete
    Alexandria Engineering Journal, 2019
    Co-Authors: Mona Elsalamawy, Ashraf Ragab Mohamed, Eslam M. Kamal
    Abstract:

    Abstract Carbonation of concrete is one of the key factors causing deterioration for reinforced concrete structures. Carbonation depth is typically used to estimate the concrete service life. Among the most important factors that can greatly affect Carbonation Resistance of concrete are relative humidity (RH) and water cement ratio. This paper investigates the effect of variation of RH on Carbonation Resistance of concrete made with different cementitious materials; CEMI42.5N, CEMIII/A42.5N, and CEMIII/A42.5N with 10% silica fume as an addition. Compressive strength and accelerated Carbonation test were conducted on different concrete mixes. The relation between Carbonation depth and RH had been analyzed, based on most common Carbonation models; model code-FIB, Chinese codes model and Jiang et al. s-model. The results indicated that relation between RH and depth of Carbonation is a polynomial function within certain range which agrees with the Chinese code. This finding is crucial for accurately predicting the Carbonation behavior of concrete structure using different models.

Shashank Bishnoi - One of the best experts on this subject based on the ideXlab platform.

  • Carbonation Resistance of cements containing supplementary cementitious materials and its relation to various parameters of concrete
    Construction and Building Materials, 2018
    Co-Authors: Vineet Shah, Shashank Bishnoi
    Abstract:

    Abstract In this study, the Carbonation Resistance of cements containing supplementary cementitious materials (SCMs) exposed to carbon dioxide concentrations of 1% and 3%, relative humidity of 40%, 60% and 80% and temperature of 27 °C and 45 °C at two different water to cement ratio is investigated. The Carbonation performance of concrete samples placed in accelerated conditions is compared to that of concrete samples exposed to natural conditions. The comparison of Carbonation coefficients of concrete exposed to different environmental conditions indicates that the rate of Carbonation is primarily governed by the extent of clinker replacement, relative humidity and water to cement ratio. Concrete mixes with slag showed better Carbonation Resistance as compared to mixes containing other SCMs. No specific correlation can be observed between the Carbonation coefficients and physical parameters of concrete (compressive strength and porosity), however, a reasonable correlation is observed between Carbonation coefficients and chemical parameters (Total alkali content, reserve alkalinity and pH). An empirical equation is developed to estimate the Carbonation depth for different cements for wide range of exposure conditions.