Experimental Study On Water-reducing Agent And Admixture Concrete By Vibration Mixing

In order to achieve high performance of concrete,multi-component concrete is mainly used at present,and the performance of concrete is improved by adding a certain proportion of mineral admixtures and additives.With the extensive application of concrete admixtures such as water reducer,air-entraining agent,early strength agent and mineral admixtures such as fly ash and mineral powder in concrete,people gradually realize that admixtures and mineral admixtures are two new and indispensable components in concrete.The use of admixtures can enable concrete to obtain specific functions.At the same time,mineral admixtures can replace part of the cement in concrete through a certain process,which not only saves natural resources and reduces manufacturing costs,but also the performance of concrete has been significantly improved.Vibration mixing,as an effective method to improve the quality and efficiency of concrete mixing,can improve the structural formation process and macroscopic performance of concrete,and has been applied at home and abroad.Study the mixing process and macro-performance change rules of multi-component concrete under vibration mixing conditions,and clarify the sensitivity of mixing methods such as vibration mixing and ordinary forced mixing to mineral admixtures and admixtures.This is for the rational use of admixtures and mineral admixtures.Mixing and ensuring the quality of concrete have important practical value.In order to study the performance changes of multi-component concrete under vibration mixing,this paper divides the test into two stages.In the first stage of the experiment,the performance changes of multi-component concrete with different admixtures and the same water-reducing agent under the two mixing modes of vibration mixing and ordinary mixing were studied,and the change law of multi-component concrete under vibration mixing was obtained.The sensitivity of the blending amount and the two mixing methods to the change of the blending amount.On this basis,the second stage studies the performance changes of multi-component concrete with different water-reducing agents under different mixing methods,verifies the results of the first stage,and determines the reasonable amount of water-reducing agent and the sensitivity of different mixing methods Sexual difference.The results show that,compared with ordinary mixing,vibration mixing will significantly increase the fluidity of multi-component concrete,improve its workability and improve concrete durability;vibration mixing can reduce the dispersion coefficient of compressive strength and improve its uniformity,making multiple groups The full life cycle compressive strength of the concrete is improved;in addition,the vibration mixing can reduce the mixing power,and can significantly shorten the concrete mixing time for the mineral powder and improve the shaft holding phenomenon.Fly ash has greater workability,durability,and lower hydration heat than mineral powder.Under this ratio,the optimal content of fly ash is between 10% and 20%,and the ore powder is around 20%.The optimal dosage of naphthalene water reducer is 0.75%,and polycarboxylic acid water reducer is 0.8%.The admixture can improve the later compressive strength,and the water reducing agent has no effect on the later strength of the concrete.Polycarboxylic acid water reducer has comprehensive advantages in improving concrete workability,durability,compressive strength,uniformity,etc.Generally speaking,ordinary mixing is more sensitive to the change of admixture content than vibration mixing,and vibration mixing is more sensitive to the change of admixture content than ordinary mixing.