A Study On Admixture Of Air Entraining Concrete Composite

Modern construction projects, concrete is the most widely applicable, one ofthe largest building materials demand. Air-entraining agent has an important role asone of the concrete admixtures, to improve the performance of concrete. In thisthesis, cited gas-concrete composite admixture of the production process and itsperformance.In this thesis, different types, different dosage of air-entraining agent used indifferent ways incorporation of compound mineral admixture where, and thenmeasured the incorporation the air entraining composite mineral admixture concreteair content change material preparation. Test with a rosin triterpenoid class,polyether three different types of air-entraining agent, these three kinds ofair-entraining agent in accordance with different contents of incorporation ofcompound mineral admixtures, air content of the concrete Determination of the thusselected types of air-entraining agent, and air-entraining agent content were studied.On the concrete mix workability test, the first doped prepared by air entrainingconcrete composite admixture with conventional air-entraining agent mixed method,this method can also improve concrete air content, and improve liquidity. Due to thesmall size of the introduction of air bubbles in the concrete mixing entrainedconcrete in engineering practice will play a the good antifreeze impermeability role.By the specific surface area of the composite of air entraining admixtures andmechanical properties, durability, energy and other indicators will be measured,compared to concrete composite air entraining admixtures and direct incorporationof air-entraining agent prepared entrained concrete performance difference. Thecomposite admixture species, dosage and temperature on the concrete air. Testshows: the composite air entraining admixtures average particle diameter smallerthan the larger surface area, so as the hydration reaction proceeds, the pores of theconcrete is reduced, more compacting concrete; increase makes late strength, thereis beneficial to the mechanical properties and to improve the durability of concrete. It was found that the air-entraining agent dosage constant, the temperature istoo high or too low to have an impact on the gas content. Therefore, it should benoted that in engineering practice, pay attention to the ambient temperature of theconcrete mixing, the temperature of raw materials entrained concrete quality,especially when the air-entraining capacity do not meet requirements should payattention to timely adjustment.The papers were studied for the first doped Law mixing air entrainingadmixture concrete composite production process, help to promote the applicationof the air entraining concrete composite admixture.The paper through the test to prove that the air entraining composite mineraladmixtures can facilitate the preparation of air-entraining concrete, high efficiencyconcrete air-entraining agent is uniformly mixed with concrete, and in the strengthand durability of late, have a certain improvement in the level to overcome the lowdosage of air-entraining agent, is not easy even difficult, especially the antifreezeconcrete mixing the northern hydraulic concrete works or alpine regions hasbrought great convenience, in order to obtain good durability of concrete aconvenient and effective measures.