Topic
Mortar
About: Mortar is a research topic. Over the lifetime, 25024 publications have been published within this topic receiving 218739 citations.
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TL;DR: In this article, the effects of a new method of mixture proportioning on the creep and shrinkage characteristics of concrete made with recycled concrete aggregate (RCA) are investigated. And the results show that the amounts of shrinkage in concretes made with coarse RCA, and proportioned by the new method, are comparable to, or even lower than, those in similar concrete made entirely with natural aggregates.
Abstract: Laboratory tests are performed to investigate the effects of a new method of mixture proportioning on the creep and shrinkage characteristics of concrete made with recycled concrete aggregate (RCA). In this method, RCA is treated as a two component composite material consisting of residual mortar and natural aggregate; accordingly, when proportioning the concrete mixture, the relative amount and properties of each component are individually considered. The test variables include the mixture proportioning method, and the aggregate type. The results show that the amounts of creep and shrinkage in concretes made with coarse RCA, and proportioned by the new method, are comparable to, or even lower than, those in similar concretes made entirely with natural aggregates. Furthermore, it is demonstrated that by applying the proposed “residual mortar factor” to the existing ACI and CEB methods for calculating creep or shrinkage of conventional concrete, these methods could be also applied to predict the creep and shrinkage of RCA-concrete.
222 citations
TL;DR: In this article, the impact of polymer modification on the physical properties of cementitious mortars was investigated using a multimethod approach, where the identification and quantification of different polymer components within the cementitious matrix was put into consideration.
219 citations
TL;DR: In this article, a short dispersion route using Pluronic F-127 as a novel dispersing agent was used to develop carbon nanotube (CNT) reinforced cement composites.
218 citations
TL;DR: In this article, the compressive strengths of concrete bricks with nano-SiO 2 particles (NS) were evaluated at various water-cementitious material ratios (w/cm).
Abstract: The amorphous or glassy silica, which is the major component of a pozzolan, reacts with calcium hydroxide formed from calcium silicate hydration. The rate of the pozzolanic reaction is proportional to the amount of surface area available for reaction. Therefore, it is plausible to add nano-SiO 2 particles (NS) to make high-performance concrete. The compressive strengths of cement mortar were evaluated at various water-cementitious material ratios (w/cm). Five different w/cm were used, including 0.23, 0.25, 0.32, 0.35, and 0.48 and four contents of NS, 3, 6, 9, and 12% by weight of cement. The compressive strengths of cement mortar with the addition of silica fume were also evaluated at a w/cm of 0.35 to compare with mortar containing nano-SiO 2 particles and three contents of silica fume were: 5, 10, and 15% by weight of cement. The experimental results show that the compressive strengths of mortars with NS were all higher than those of mortars containing silica fume at 7 and 28 days. It was demonstrated that the nano-particles were more valuable in enhancing strength than silica fume. This paper also analyzes some available examinations to monitor the hydration progress continuously, such as SEM observation, residual quantity test for Ca(OH) 2 , and the rate of heat evolution. The results of the examinations indicate that the SiO 2 in nano scale behave not only as a filler to improve the microstructure, but also as an activator to promote pozzolanic reactions.
216 citations
TL;DR: In this article, the corrosion behavior of steel in concrete, mortar, or in simulated pore solution is studied, and it is shown that steel needs to be kept at least three days in synthetic pore solutions and seven days in mortar to be passivated.
216 citations