水玻璃对地质聚合物抗压强度及孔结构的影响  

Effect of Water Glass on Compressive Strength and Pore Structure of Geopolymers

作　　者：李亚林[1] 王顺风[1] 马雪[1] 李玉香[1] 王进[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010

出　　处：《非金属矿》2017年第2期46-49,87,共5页Non-Metallic Mines

基　　金：国家自然科学基金(11405140)

摘　　要：采用正交试验研究了水固比、碱激发剂的固含量与模数对地质聚合物抗压强度和孔结构的影响。结果表明:水固比在0.48~0.68、碱激发剂固含量在36%~40%范围内的调整将对地质聚合物的孔结构(孔隙率、孔径分布)和抗压强度产生明显影响。降低水固比有利于减少有害孔和多害孔,适当提高碱激发剂的固含量有利于颗粒中铝硅玻璃相的溶解,促进凝胶相的生成,使得微观结构均匀而致密,抗压强度得以提高。地质聚合物的抗压强度与孔隙率符合Y=844.27·exp-8.06X的指数关系。当水固比、碱激发剂的固含量和模数分别为0.48、40%和1.4时,地质聚合物的孔隙率最低,为34.37%,28 d抗压强度最高,为53.13 MPa。The effect of water-solid ratio, the solid content and modulus of alkali activator on the compressive strength and pore structure of geopolymer were studied by orthogonal experiment in this paper. The results indicate that the pore structure and compressive strength of geopolyrners are obviously influenced when the water-solid ratio change from 0.48 to 0.68, as well as alkaline solid content varied from 36% to 40%. Reducing the water- solid ratio is advantageous to decrease the production of the harmful pores and the more harmful pores. Improving the solid ratio in alkali activator is good for the dissolution of aluminosilicate glass phase in particles and promotes the formation of the gel phase in geopolymers, leading to the formation of homogenous and dense microstructure and improvement of compressive strength. The relationship between compressive strength and porosity of the geopolymcr conform to the exponential equation：Y=844.27·exp^-8.06X. When water-solid ratio is 0.48 and the solid content and modulus of alkali activator is 40% and 1.4 respectively, the geopolymer achieved the lowest porosity （34.37%） and highest compressive strength at the age of 28 d （53.13 MPa）.

关 键 词：地质聚合物 抗压强度 孔隙率 孔径分布 

分 类 号：TQ177[化学工程—硅酸盐工业]