Topic
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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TL;DR: In this paper, a multistep micromechanics approach that starts at the nanolevel of the C-S-H matrix, where two types of C−S−H develop in the course of hydration, is proposed to predict the aging elasticity of ordinary portland cement.
491 citations
TL;DR: In this paper, the physical, mechanical and durability properties of concrete incorporating recycled aggregate are analyzed, and recommendable mixtures for recycled aggregates in aggressive environments are suggested based on the results obtained.
491 citations
TL;DR: In this article, the authors employed Diffuse Reflectance Infrared DR-FTIR spectroscopy to monitor chemical transformations in pastes of Portland limestone cement and concluded that the setting is caused by interparticle coalescence of C-S-H.
489 citations
TL;DR: In this paper, the morphology, fineness and pozzolanic activity of four glass powders (GP-fine and GP-dust) were investigated from the screening of crushed waste glasses, one from a dust collector for the glass crushing process and two from further grinding of the powder from the dust collector in a ball mill.
488 citations
TL;DR: In this article, carbon nanotubes (CNTs) treated by using a mixed solution of H2SO4 and HNO3 were uniformly dispersed into cement paste by means of ultrasonic energy.
Abstract: Carbon nanotubes (CNTs) treated by using a mixed solution of H2SO4 and HNO3 were uniformly dispersed into cement paste by means of ultrasonic energy. Electrical resistivity and pressure-sensitive properties under cyclic compressive loading of this composite were analyzed and compared to that of untreated-CNT reinforced cement paste. Results show that the addition of treated or untreated CNTs to cement paste leads to a notable decrease in volume electrical resistivity and a distinct enhancement in compressive sensitivity. The microstructures of these cement composites were analyzed by using scanning electron microscope. The microscopic observation reveals that both treated and untreated CNTs were dispersed homogenously in the cement matrix. For untreated CNT-reinforced cement composites, the CNTs with glossy surface were zigzag and cling to cement matrix; the bridging of cracks and a well three-dimensional meshwork were also observed. For treated-CNT reinforced cement composites, the surface of CNTs was covered by C–S–H, which leads to a higher mechanical strength. The contact points of the treated-CNTs in composites were much fewer than that of the untreated-CNTs in cement matrix composites, which leads to a higher compressive sensitive properties and a lower electrical conductivity.
482 citations