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Effects of redispersible latex powder, cellulose ether, defoamer and boric acid on properties of thin-layer masonry mortar for ALC wallboard were studied. The results show that the incorporation of cellulose ether can significantly increase the water retention of thin layer mortar, but has a great negative effect on the 28d compressive strength. Compared with cellulose ether, the redispersible latex powder can significantly improve the bond performance of thin layer mortar. When the rubber powder content is 0.8%, the 14d tensile bond strength is 4.5 times of the blank group. When defoaming agent is mixed with cellulose ether, the reduction of compressive strength can be slowed down to a certain extent. [ABSTRACT FROM AUTHOR]

This paper mainly studies the effects of raw materials, mix proportion and forming method on the 28 d ages impermeability pressure of reference mortar impermeability test piece, and finds a suitable mix proportion and forming method: 290 g of reference cement, 1350 g of standard sand and 260 g of water, which is formed by one-time loading and vibrating on the cement mortar vibrating table for 8 s. It is possible to make the 28 d ages impermeability pressure of the reference mortar impermeability test piece be 0.3~0.4 MPa; And explore the feasibility of a rapid determination method, that is, using 60 °C hot water to accelerate curing for 3 days, we can quickly determine whether the impermeability pressure of the reference mortar impermeability pressure test piece for 28 d ages can meet the standard requirements, which provides a reference for the development and testing of cement- based permeated crystalline materials. [ABSTRACT FROM AUTHOR]

The effect of calcium stearate and organosilanepowder hydrophobic agent on the performance of cement-based joint filler was studied through experiments. The results show that the flexural strength and compressive strength of cement-based sealant show a slightly increasing trend with the increase of the dosage of calcium stearate from 0 to 1.0% and organosilanepowder hydrophobic agent from 0 to 0.10%. After 25 times of freeze-thaw cycle treatment, the flexural compressive strength decreases slightly. The water absorption at 30 and 240 min showed a decreasing trend. The wear resistance value showed a rising trend. The contraction value showed a downward trend. [ABSTRACT FROM AUTHOR]