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Cement

About: Cement is a research topic. Over the lifetime, 68440 publications have been published within this topic receiving 829356 citations.


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Journal ArticleDOI
TL;DR: An experimental investigation was carried out to study the effect of carbonation on mechanical properties and durability of concrete as mentioned in this paper, which showed that carbonation may compensate some concrete properties such as compressive strength, splitting strength, electrical resistivity and chloride ion penetration.
Abstract: An experimental investigation was carried out to study the effect of carbonation on mechanical properties and durability of concrete. Ordinary portland concretes (OPC) with water/cement ratios of 0.58 and 0.48 and self-compacting concretes (SCC) with water/binder ratios of 0.40 and 0.36 were used in this study. Compressive strength test, splitting strength test, electrical resistivity test, rapid chloride penetration test (RCPT), open circuit potential method and alternative current (AC) impedance method were performed to estimate the properties of concrete. Test results showed that carbonation may compensate some concrete properties such as compressive strength, splitting strength, electrical resistivity and chloride ion penetration. However, corrosion test results showed that carbonation increases corrosion rate of reinforcing steel.

148 citations

Journal ArticleDOI
TL;DR: In this article, the early age hydration mechanisms of accelerated CEM I pastes were evaluated using liquid phase analysis, conductimetry, isothermal calorimetry and in situ XRD and SEM.

148 citations

Journal ArticleDOI
TL;DR: In this article, the potential expansion of concrete due to alkali-silica reaction (ASR) was monitored according to the procedure of British Standard BS 812 Part 123:1999.
Abstract: The potential use of waste recycled glass in concrete as recycled glass sand (RGS) and pozzolanic glass powder (PGP) was examined in this study. No major difference was found in compressive strength of concrete with the presence of RGS as sand replacement. While, the compressive strength of concrete reduced by 16 and 10.6% at 28 and 364 days respectively when 20% of Portland cement was replaced by PGP. The potential expansion of concrete due to alkali-silica reaction (ASR) was monitored according to the procedure of British Standard BS 812 Part 123:1999. As a siliceous material, the use of RGS as sand replacement in concrete possesses high risk of ASR expansion. Therefore, cracks were observed when RGS was used as sand replacement in concrete without any precautions to minimize this risk. Different materials were used as ASR suppressors to mitigate the potential risk of ASR, such as: ground granulated blastfurnace slag, metakaolin, PGP, and lithium nitrate (LiNO 3 ). The expansion associated with ASR was significantly reduced when the ASR suppressor was used in concrete.

148 citations

Journal ArticleDOI
TL;DR: The first study examining the feasibility of carbon sequestration in cement kiln dust (CKD), a byproduct generated during the manufacturing of cement, finds that the overall extent of carbonation/sequestration was greater in columns with lower water contents, and the major sequestration product appears to be calcite.

148 citations

Journal ArticleDOI
01 Jul 1984
TL;DR: In this paper, an investigation was performed to explain experimentally the changes occurring in the microstructure and phase composition of cement pastes during their exposure to heat in the temperature range 20-800°C.
Abstract: The investigation performed was aimed at explaining explaining experimentally the changes occurring in the microstructure and phase composition of cement pastes during their exposure to heat in the temperature range 20–800°C. The investigation was performed by means of the following methods; thermal analysis, X-ray diffraction analysis, infrared spectroscopy analysis and mercury porosimetry. During the investigation observations were made regarding the behaviour of the following phases in pastes exposed to heat: Ca(OH)2, CaCO3, C−S−H, non-evaporable water and micropores. From an analysis of the experimental results, temperature ranges of the following changes were determined in the structure of the investigated paste: additional hydration of unhydrared cement grains, recrystallization and carbonization of Ca(OH)2, deformation and transformation of C−S−H phases, non-linear changes in the distribution of pore diameters and total porosity.

148 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20248
20234,852
20228,607
20213,442
20203,929
20194,260