Experimental Study On Mechanical Properties And Carbonation Resistance Of Air-entrained Concrete

China is now in the large-scale period of construction, concrete is seen as a very important building materials, the durability of concrete is directly related to people's livelihood. The main factor is steel corrosion which led durability of reinforced concrete structure to deteriorate, and in the general atmospheric environment, carbonation of concrete reinforcement corrosion in concrete is a prerequisite. The emergence of concrete admixtures, largely resolved this problem, especially the emergence of air-entraining agent introduced a large number of uniformly distributed, stable and closed the small bubbles during the concrete mixing, can effectively improve the performance index of concrete materials, and has a role in promoting to improve the durability of concrete, carbonation resistance is an important indicator of concrete durability. Therefore, This should be a systematic experimental study on performance, mechanical properties and carbonation resistance of air-entraining concrete.The main contents of this paper are:1. The concrete mix of reference, different contents of air-entraining agent, different water-cement ratio of air-entraining, different sand ratio of air-entraining,and different amount of cement of air-entraining are designed in this paper by assuming bulk density.2. Entraining concrete performance is mainly tested and analysed on gas content of which during different time of stirring,still after mixing,and jolt ramming.3. The mechanical properties of air-entraining concrete is experimental researched from the cube compressive strength, axial compressive strength, flexural strength, and elastic modulus,to analyse mechanical index changes of different gas content of air-entraining concrete.4. Entraining concrete carbonation resistance is firstly compared by carbonation depth indicator of air-entraining concrete and ordinary concrete.And then tested and analysed on air-entraining concrete carbonation depth of different gas content,different water-cement ratio, different sand ratio,and different amount of cement.Finally,carbonation depth of Reference concrete mix and all parametric mix is simulated with Model fitting curve parameters,the time parameter data is weighted and then taken the average, Thus modify the time parameters of ordinary concrete carbonation model,to provide a valid reference for concrete air-entraining at aspects of carbonation resistance.