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 article, the influence of three variables (cement particle size distribution, fly ash PSD, and ratio of fly ash to cement) at each of four levels on the yield stress and viscosity of blended pastes was investigated.
209 citations
TL;DR: In this paper, chemical shrinkage of cement was calculated from chemical equation of hydration, it was compared with observed one and relationship between them was clearly described and defined by definition of chemical shrinkages and autogenous shrinkage was made.
209 citations
Patent•
3M1
TL;DR: In this article, a dental cement containing water, acid-reactive filler, water-miscible acidic polymer, an ethylenically-unsaturated moiety, photo-initiator, and water-soluble reducing agent is described.
Abstract: Dental cement containing water, acid-reactive filler, water-miscible acidic polymer, an ethylenically-unsaturated moiety, photoinitiator, water-soluble reducing agent and water-soluble oxidizing agent. The cement has three curing modes, namely an acid-filler ionic reaction, a photoinitiated crosslinking reaction and a redox-initiated crosslinking reaction. The cement cures well in thick layers, and can be used without a dental curing light or with a light that is weak or defective.
209 citations
TL;DR: In this article, the benefits resulted from various ratios of rice husk ash(RHA) on concrete indicators through 5 mixture plans with proportions of 5, 10, 15, 20 and 25% RHA by weight of cement in addition to 10% micro-silica (MS) to be compared with a reference mixture with 100% Portland cement.
209 citations
TL;DR: In this article, the influence of binder type and dosage on the mechanical properties and microstructure of CPB was investigated using ordinary Portland cement (OPC), Portland composite cement (PCC), and sulphate resistant cement (SRC).
Abstract: In this study, the influence of binder type and dosage on the mechanical properties and microstructure of cemented paste backfill (CPB) was investigated using ordinary Portland cement (OPC), Portland composite cement (PCC) and sulphate resistant cement (SRC). The CPB samples of OPC and PCC were observed to lose their unconfined compressive strengths (UCSs) after 56 days. This could be associated with the sulphide moiety of the tailings, i.e. the attack on hydration products by sulphate and acid internally generated via the oxidation of pyrite present. In this respect, those CPB samples of sulphate resistant-based cements (SRC and a mix of OPC and SRC) maintained good long-term strengths and stability (i.e. no loss of strength). Increasing binder dosage (5–7 wt.%) improved the UCSs of CPB samples up to 1.9-fold with no loss of strength at >5 wt.%. Decreasing water-to-cement ratio appeared to produce a beneficial effect on the UCSs of CPB samples. SEM studies have provided further insight into the microstucture of CPB and confirmed the deleterious formation of gypsum as the expansive phase. These findings have demonstrated the practical importance of binder type/dosage and water-to-cement ratio for the short- and long-term mechanical performance of CPB.
209 citations