Dependence of efficiency of pressure compaction on the cement type used

• Published in: Construction & building materials 2011-07, Vol.25 (7), p.3073-3077
• Main Authors: Zivica, Vladimir, Krizma, Martin
• Format: Article
• Language: English
• Subjects: Building materials; Cement; Cements; Compacting; Composition; Compressive strength; Construction materials; Hydration products; Measurement; Mechanical properties; Pastes; Porosity; Pressure; Pressure compaction; Quality management; w/ c ratio
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2010.12.061

► Dependence of cement based materials properties on w/c ratio used. ► Effect of high pressure compaction of fresh cement mixtures. ► High strength reached under the very low w/c ratio and high pressure compaction combination. ► Efficiency increase with the cement quality decrease. The results of the study on the properties of the pastes, with w/ c ratio 0.20–0.10, compacted in the fresh state by the pressures between 27 and 82 MPa are given. The comparison of their properties with those found at the reference non-pressured cement pastes prepared with w/ c ratio 0.30 showed the significantly increased compressive strength. Two effects were the cause: the significant decrease of the initial porosity due to the extremely low w/ c ratios and the mechanical compaction of the fresh pastes. It has been found a significant increase of the effectiveness of the pressuring by the cement quality decrease. The long-term development of the properties of the pressured cement pastes is similar to the non-pressured cement pastes. At the conservation of the properties differences in the benefit of the pressured materials.