Study On Performance Of Crack-against Dry-mixed Mortar

At present, the domestic construction promotes with great effort using the non-clay wall material substitution to mount the cob brick, but the following wall dehiscence question is extremely obvious. In view of this problem, we embarks from the material control angle, necessary guarded against the crack to it to mix the mortar dryly the component and mixes the quantity to do the comprehensive system research.First, this article made selective experiment on the component of dry-mixed mortar. The synthesis considered from the mortar work related and mechanics performance that, in the definite mortar component the cellulose ether and may again disperse emulsion powder the type.Next, used four factor three levels orthogonal experiments to study the quantity of four component in dry-mixed mortar, to conduct the research, but is advantageous to the later period intensity enhancement; Then water reducing agent major effect mortar intensity. The overall evaluation mortar performance and the cost, determined initially the cellulose ether, may disperse the emulsion powder, the FA and the water reducing agent mixes the quantity in turn is again the gel gelation gelling material amount used 1‰, 2%, 25%, 6‰.Then, mixes the quantity through the adjustment FA, to mixes the mortar dryly the cost and the quality carries on the optimization, and finally determined various components mix the quantity to utilize in three group of different hydrogel ratio contrast experiment, will do mixes the mortar and the datum mortar makes each performance the contrast experiment. The result indicated, when the FA mixes the quantity is 25% mortar each performance is most superior;. This article also used the pessimistic theory to mix the mortar the long-term contraction performance to carry on the analysis dryly, and has established the forecast contraction GM(1,1) model.Finally, researched the microstructure of dry-mixed mortar and datum mortar through SEM and MIP. The result showed that, dry-mixed mortar total factor of porosity is bigger than the datum one, the polymer becomes the network structure and the bridge joint function which the membrane formed improved the mortar interior structure.