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: The influence of the addition of some superplasticizers employed for maximising the solid loading of Portland cement pastes has been investigated in this article, where three commercial super-plasticizing agents were used: a melamine resin (Fluiment 33 M), a modified lignosulphonate (Concretan 200 L), and a modified polyacrylate (Ergomix 1000), which shows a marked shear-thickening behaviour above a critical deflocculant concentration and slight elastic effects particularly at high dosages as well.
163 citations
TL;DR: In this paper, rice husk ash (RHA) was used in order to strengthen pozzolanic cement paste and the effect of 0, 2, 4, 6, 8, 10% and 12% weight percentages as a cement replacement in concrete mixtures on the mechanical properties was studied.
163 citations
TL;DR: The experimental cement released calcium and increased the pH of the storage solutions in a similar manner to MTA- Angelus, however, EC showed significantly higher calcium release than commercial MTA-Angelus after 24 h.
Abstract: Aim To evaluate the release of calcium ions, pH and conductivity of a new experimental dental cement (EC) and to compare them with those of mineral trioxide aggregate (MTA-Angelus).
Methodology Five samples of each cement were prepared using plastic tubes 1 mm in diameter and 10 mm long. Each sample was sealed in a test tube containing 10 mL deionized water which was analysed after 24, 48, 72, 96, 192, 240 and 360 h for pH, electrical conductivity and calcium release. The concentration of calcium ions was obtained through atomic absorption spectroscopy technique. The data were analysed statistically using the analysis of variance (anova) and the Student's test (t-test).
Results The pH of the storage solutions was not affected by the material and the interaction of material with time (P > 0.05). However, the time of immersion was significant (P < 0.01) for both materials. For the electric conductivity and calcium release, the interaction of material with time was statistically significant (P < 0.01), indicating that EC and MTA-Angelus did not behave in a similar manner.
Conclusions The experimental cement released calcium and increased the pH of the storage solutions in a similar manner to MTA-Angelus. However, EC showed significantly higher calcium release than commercial MTA-Angelus after 24 h.
163 citations
TL;DR: In this article, a method was developed to assess the details of the economic and environmental potential of the specific Limestone Calcined Clays Cement LC3 technology in the Cuban context.
163 citations
TL;DR: In this paper, a hybrid life-cycle assessment method was performed on national and provincial statistics to study pollutants generated by the cement industry in China, the impacts of these pollutants, and the potential for environmental improvement.
163 citations