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Despite its capability of various structural uses and its efficiency as a structural material, concrete has a problem with its tendency to be fairly massive to match the needed strength in comparison with steel materials. Instead of normal Portland concrete, lightweight concrete can be utilized to reduce the weight of completed structure, to expand span and to contract the width of section, particularly high-strength lightweight concrete. The purpose of this study is to provide better insight into the strength-enhancement of high-strength lightweight concrete, gained through an experiment.
In the experiment, four kinds of cement were used: ultra-high early strength cement, micro cement, normal Portland cement, and low heat cement. Comparing the numerical values of strength at two concrete of 7days and 28days, the analysis of different features of strength each concrete had, was conducted. The change in compressive strength depending on whether silica fume was added as an additive was also analyzed.
For the high-strength lightweight concrete to obtain high compressive strength up to 60Mpa, the addition of silica fume, super-plasticizer and water reducing agent are absolutely essential.
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