硅烷改性沸石对胶砂流动度和抗压强度的影响

Fluidity and compressive strength of mortar with zeolite modified by silane

为改善掺沸石粉混凝土的和易性,采用异丁基三乙氧基硅烷对天然沸石进行改性处理,研究其对水泥胶砂流动度和抗压强度的影响。结果表明:硅烷改性处理可以在不显著降低胶砂强度的情况下,明显改善掺沸石粉胶砂流动性能。经硅烷改性处理后,沸石吸水率显著降低,以其磨细粉制作的水泥胶砂具有更高的流动度,当掺量(质量分数)为10%时,其水泥胶砂流动度比掺天然沸石粉和复掺粉煤灰分别高出11.5%和8.6%;强度测试也表明,硅烷改性处理沸石粉火山灰活性有所降低,但随着养护龄期的增长,其强度逐渐接近甚至超过基准组,不影响水泥胶砂的正常使用。

In order to improve the compatibility of zeolite-doped concrete,isobutyltriethoxysilane was used to modify natural zeolite,and its effect on the flow and compressive strength of mortar was studied.The results show that the silane modification treatment can significantly improve the fluidity of zeolite-blended concrete without significantly reducing the strength of the cement mortar.After the silane modification treatment,the water absorption of zeolite was reduced significantly,and the mortar made by its finely ground powder had higher fluidity.When the content(mass fraction)is 10%,its mortar fluidity is 11.5%and 8.6%higher than that of natural zeolite powder and compound fly ash respectively;strength test also shows that the silane-modified treatment of zeolite powder volcanic ash activity has been reduced,but with the growth of curing age,its strength gradually close to or even exceed the control group,does not affect the normal use of cement mortar.