Study On Application Of Mechanism Sand In High Performance Concrete

At present, nature sand which has been used in most areas of China is non-reproducible local resource and not suitable to be transported for long distance. With infrastructure developing and environment protection requirements, the nature sand is becoming more and more deficient and the quality is becoming worse in many areas of China. And under certain circumstance, nature sand exploitation has been limited or forbidden, especially for concrete use. Sand price is soaring, and the sand even can't be supplied during sand supply peak period, which delays the construction progress. In order to keep pace with the new trend development, the mechanical sand type has been first added into GB/T 14684-2001 Construction Sand which has been implemented since 1st Feb. However, just like any other new thing, at present, the mechanism sand develops unbalanced; there is still great resistance. The technology study and popularizing mechanism sand applied for HPC is still an urgent task in front of engineering technicians, management staff and designers. In this paper, making reference on compacted gradation mix ratio design method for densely compacted concrete from Professor Huang Zhao long of Taiwan Technical University, high-performance concrete mix design with mostly densely accumulation, minimum cement content and maximum unit weight are designed.From the research on mechanism sand crushing index, arris and coarse degree, powder content, sand equivalent, parent material strength, as well as mechanism sand manufacturing technique, quality control norms for mechanism sand have been proposed. And contrastive test has been made on concrete of river sand, mechanism sand and mixed sand to make research on function and characteristics of high-performance concrete mixed by mechanical sand and carry out rebounding testing research to determine specific rebound strength-measure curve for mechanical sand and verify it through practical project examples. The thesis is just acting as the opening for more to come which acts as reference for similar research and practice in near future.