Experimental Study On Flexural Behavior Of Desert Sand Concrete Beams

Engineering construction requires large amounts of sand, stone and other construction raw materials. According to the size of the particle size, these materials can be divided into two groups: fine aggregates and coarse aggregates. Fine aggregates includes natural sand and artificial sand. Natural sand refers to rocks whose size is less than 5.00 mm, which are results of natural affect in a long period of time. According to different material resources, natural sand may come from river sand, sea sand, mountain sand, etc. River sand particles generally have rounded shapes, which are mostly used in engineering construction, and formed by running water. Sea sand is formed due the long sea erosion, and its particles are smooth and relatively clean, but often mixed with some shell fragments and higher chloride content, if the sea sand used in the construction, the desalination process is indispensable. However,desalination process will increase project cost, sea sand, therefore, generally infrequently used in construction projects. Mountain valley or old riverbeds are source of mountain sand, which have more angular particles and rough surface, and the concrete mixture bonded better, illiquidity of mixture however is not good enough. Artificial sand refers to small rock particles nominal diameter of which is less than 5.00 mm,which are formed through a series of processes,such as mining, mechanical crushing, screening etc. Artificial sand has a rough surface,edgy corners and a large powder content.Along with the further development of the national economy, China’s infrastructure construction has begun to built on a large scale, the existing sand resource will not be able to meet the demands of the construction of the scale, especially in many parts of our country, like Xinjiang province, even there is not enough coarse sand resources, as though there are a large quantity of fine sand resources. Merely requesting coarse sand in engineering construction will increase the project costs. Under such condition, developing and utilizing of abundant fine sand resources, especially applying specific engineering practice has the practical significance on the perspective of sustainable development and has far-reaching social significance for this remote northwestern region of China.In this paper, based on the physical and chemical properties of desert sand, we have tried to mix proportion ratio of concrete and found out the mix proportion ratio of desert sand concrete, as a replacement of general engineering sand concrete, strength of which are at the strength grade of C20 and C30. In the next step, we are going to make reinforced concrete beams and use the desert sand reinforced concrete beams member make normal section failure test. Through experimental study of the items we are going to discuss whether or not desert sand concrete can be a alternative to ordinary engineering sand concrete, at the same time solve some basic theoretical and technical issues. In this way we hope to promote the application of desert sand in engineering construction, and promote the application and development of new materials and construction techniques, and broaden the desert sand prospect to provide reliable, effective technical means.