Of sand used in the construction of 60 years from the 20th century has started, the river sand, river sand, the use of natural sand is still relatively common, the State Construction Commission in 1973 was held in Guizhou Province in the sand in the concrete application of the argument will be, by building materials and construction industry exchange of experience, certainly the research results, and developed a "Technical Specification for concrete sand." Since then, the mechanism to expand the scope of application of sand from the construction industry expanded to highways, railways, water, electricity, metallurgy and other systems, the project expanded to block retaining bridges, tunnels and hydraulic engineering, from development to ordinary concrete mortar, steel concrete, prestressed concrete, pumping concrete, sprayed concrete and air tightness anchor works. However, standards and technical specifications of the pilot and test materials, the imperfections of the lag, the natural sand of the construction industry there is a strong dependence of many important structures in the sand on the use of constraints still exist. Mostly sand with natural sand supply, or in the economic comparison are significant differences between the programs when the last resort.
   Large number of applications in building construction is imperative sand: sand is composed of the main material of concrete, with the construction industry and the importance of construction quality, building the number of sand growing market, increasing quality requirements high, and qualified, but less natural sand resources, which lead to the engineering quality, destruction of farmland, water resources are becoming increasingly serious, sand production is also due to changed in resources, construction quality and quantity of sand construction market is becoming more apparent. Recognition of the status of sand and qualified to regulate the use of building materials is imperative.
   Sand and natural sand with contrast:
   (1) robustness and durability testing; rugged sand slightly worse performance than the river sand, but still achieved GB / T 141684293 Excellence standard indicators used in ordinary concrete is not a problem. However, friction and shock suffered in the regular use of concrete structures, with the exception must be mixed with additives, but also the control of gray concrete than sand and crushed sand and dust content indicators.
   (2) The mechanism of sand and gravel mixture powder content on properties of cement; through the test of cement, mortar test, concrete test
Preparation of concrete with sand and natural sand is no big difference, in general, with the slump under the premise of sand in the water to be slightly larger, but the conditions and structures under construction and transportation considerations. However, the strength of concrete is essentially the same; pumping concrete mixed with sand and other special attention to concrete when the sand percentage should not be too high, reduce the concrete strength and durability to prevent the engineering quality.
   In the construction process, the sand and gravel concrete structural materials as an integral part of the merits of its quality and durability of the quality of the whole project has a significant impact. Performance in meeting the sand under the premise of the program economically viable use, it is necessary to meet the requirements of construction quality, but also to effectively control production costs, so the lack of resources in the areas of natural sand, the use of high-quality sand for concrete production is not only feasible, and the overall efficiency is significant. At the same time sand used in building materials can also be subjects of research trials, gain experience, lay the foundation for the development of the discipline.

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