为了得到碱渣-粉煤灰-硅酸钠溶液体系新型注浆材料各组分的作用和固化机理,考虑不同固体质量配比和养护条件,通过温度变化、固化收缩、抗压强度和傅里叶变换红外光谱试验对比研究不同体系的差别.结果表明:碱渣中Ca(OH)2和粉煤灰中的CaO遇到硅酸钠溶液时发生放热反应;浆液早期抗压强度由碱渣中CaCl2、Ca(OH)2和CaSO4与硅酸钠溶液反应生成水化硅酸钙凝胶决定,由于粉煤灰受碱激发生成了硅铝酸盐聚合物凝胶使得注浆液7~50 d抗压强度有大幅增长;FTIR试验证实了水化硅酸钙凝胶(C-S-H)和硅铝酸盐凝胶(N-A-S-H)的存在;原材料组分保证了浆液收缩程度小、流动性好、不易离析、结石率大等优点.
Soda residue, fly ash and sodium silicate solution were synthesized as grouting materials.Considering different solid mass ratios and curing conditions, temperature and shrinkage were observed while compressive strength and FTIR tests were conducted to explore the effect of each material and solidified mechanism of new slurry.Results show that Ca(OH)2 in soda residue and CaO in the fly ash have the exothermic reaction with sodium silicate solution.The early strength of slurry is dependent on hydrate calcium silicate gels from the reaction of CaCl2, Ca(OH)2 and CaSO4 with sodium silicate solution.7-50 d compressive strength increment is determined by aluminosilicate polymer gel generated by alkali-activated fly ash.FTIR results confirm the coexistence of C-S-H and N-A-S-H gel in this system.The properties of slurry are ensured well by raw materials on the shrinkage, mobility, segregation and stone rate.
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