Research On The Preparation And Frost Resistance Of The High Volume Mineral Admixtures Concrete

With the high-speed development of society, the demand of reinforced concrete is getting bigger, the same time, mass production of concrete is often accompanied by huge environmental pollution, and the emergence of the large mineral admixtures concrete is no doubt provides a valid path to relieve the problem, but after years of development, there is no standard preparation method for the large mineral admixtures concrete, and the frost resistance also needs to be further relevant tests. Therefore, research on the preparation method and the frost resistance of large mineral admixtures concrete is very important.Based on the fluidity test of concrete cementing material paste, the compatibility of cement and water reducer and the best mixing amount of the components and adding method were studied; The additives(water reducer, retarder and air entraining agent) were compounded and the optimum dosage was also studied; The same time, in accordance with mortar strength, the large mineral admixtures concrete was successfully formulated, and its frost resistance was also studied. During the experiment some conclusions are as follows:Through the research it was found that large volume mineral admixtures concrete could be prepared according to the order of paste, mortar, concrete, and determine the optimum content of mineral admixtures based on the strength of cement mortar, which reflect the ratio of concrete; In addition, the increasing of the W/B and number of freeze-thaw cycle could reduce the frost resistance of the concrete; The mass loss rate of the high content mineral admixtures concrete is more sensitive to the concrete frost resistance than the relative dynamic elastic modulus; In addition, A large number of mineral admixtures to concrete mixed means a unfavorable to maintain its antifreeze performance; While the increase of air content of concrete is conducive to the improvement of its frost resistance.