蒸压加气混凝土薄灰缝砌体新型专用粘结剂性能研究

Study on Performance of New Special Mortar for Thin Mortar Joint Masonry of Autoclaved Aerated Concrete

目的配置适用于蒸压加气混凝土薄灰缝砌体的新型专用粘结剂。方法以砂浆的拉伸粘结强度、稠度及立方体抗压强度为指标,通过正交试验确定专用粘结剂的基准配合比;利用外加剂羟丙基甲基纤维素醚、可再分散乳胶粉以及引气剂对专用粘结剂基准配合比进行改性,最终确定新型专用粘结剂的最优配合比。结果蒸压加气混凝土薄灰缝砌体新型专用粘结剂的最优配合比为m(砂)∶m(水泥)∶m(粉煤灰)∶m(水)∶m(羟丙基甲基纤维素醚)∶m(可再分散乳胶粉)∶m(引气剂)=540∶290∶130∶260∶3∶5∶0.3,其拉伸粘结强度为0.58 MPa、稠度74 mm、立方体抗压强度14.8 MPa,均满足专用粘结剂最优配合比标准。结论配置的蒸压加气混凝土薄灰缝砌体新型专用粘结剂在实际工程中具备优良的应用性,并且对蒸压加气混凝土砌块墙体保温隔热性能的提高效果显著。

Equiped with new special mortar suitable for thin mortar joint masonry of autoclaved aerated concrete.Taking the tensile bond strength,consistency and cube compressive strength of mortar as indexes,the benchmark mix proportion of special mortar was determined by orthogonal test.The benchmark mix proportion of special mortar was modified by using the admixtures of hydroxypropyl methylcellulose,redispersion emulsoid powder and air entraining agent,and finally determine the optimal mix proportion of new special mortar.The optimal mix proportion of new special mortar for thin mortar joint masonry of autoclaved aerated concrete is:m(sand):m(cement):m(fly ash):m(water):m(hydroxypropyl methylcellulose):m(redispersion emulsoid powder):m(air entraining agent)=540:290:130:260:3:5:0.3,the tensile bond strength of 0.58 MPa,consistency 74 mm,cube compressive strength 14.8 MPa,all meet the the standard of optimum mix proportion of special mortar.The new special mortar for the thin mortar joint masonry of autoclaved aerated concrete has excellent application in practical engineering,and has remarkable effect on improving the thermal insulation performance of the wall of autoclaved aerated concrete block.