Experimental Research On The Flexural Behavior Of Concrete Slabs With Tailing Sand

With the development of the human society, the construction industry and the mining industry were also prosperously developed. The flourishing development of the construction industry leads to a large amount increasement of the concrete. At the same time, the quantity of the sand for the preparation of concrete also increases significantly. Now the natural sand resource in China is seriously on the decrease. The using of the tailing sand instead of the natural sand in the preparation of the concrete have a remarkable social benefit and economic benefit, which can not only satisfy the need of the engineering construction of a large amount of sand and may save natural sand resource, but also solve the problem of the stacking pollution and harm the tailing sand caused.Through the test which have been done between the four one-way concrete slabs with different tailing sand replacement rate(40%、50%、60%、70%) and a piece of ordinary concrete one-way slab, this article analyzes the influence of tailing sand replacement rate to the failure patterns、deformation characteristics and the flexural performance of the testing concrete slabs. The article mainly has a research of the calculation methods of cracking load, ultimate load, the maximum width of crack and the mid-span deflection; and a comparison is done between the theoretical value and the test value. The influence of the thickness and the reinforcement ratio to the cracking load, the ultimate load and mid-span deflection of the tailing sand one-way concrete slabs have been explored through the ANSYS finite element simulation.The main conclusions of this article are:(1) Similar with the process of stress of the ordinary concrete specimen, the tailing sand concrete slabs also have four obvious stages of elastic, cracking, yielding and ultimate. The flexural strain variation obeys the plain-section assumption. Under the same conditions, the cracking load and the ultimate load are basically the same to the ordinary concrete slab.(2) According to the formulas in the current Code for design of concrete structures(GB 50010-2010); the cracking moment, the ultimate moment, the maximum width of crack and the mid-span deflection were checked. The result shows that: The formulas of the cracking moment and the ultimate moment of the ordinary concrete slab can be used to the tailing sand concrete slabs. The formulas of the maximum crack width and mid-span deflection can be only used to the low replacement rate specimen of TCB-1.(3)The analysis of ANSYS finite element simulation shows that: The load of cracking of the tailing sand concrete slab increases with the thickness of the specimen; when the ratio of the longitudinal reinforcement of the specimen increases, the cracking load is not obviously increased. The ultimate load of the tailing sand concrete slab increases with increasement of the thickness and the ratio of the longitudinal reinforcement of the specimen. The flexural rigidity of tailing sand concrete slab increases with increasement of the thickness and the ratio of the longitudinal reinforcement of the specimen.