摘要
采用水玻璃激发的方法制备了印染污泥粉煤灰地质聚合物,研究了其分子结构、物相、微观形貌、强度和重金属浸出质量浓度,并试制了路面砖。结果表明:印染污泥的掺入促进了地质聚合反应的进行,胶体物质微观形貌更加弥散和扩大;体系中除地质聚合物外,还产生了钙系化合物凝胶、钙矾石和硫酸钠晶体,使强度随印染污泥掺量的增加先增大后降低,在10%掺量时表现出较好的力学性能;利用煅烧印染污泥中的赤铁矿为着色剂,试制的路面砖呈红色,并能满足标准中最低抗压强度等级、吸水率和抗冻性的要求,其重金属浸出质量浓度低于标准规定的限值。
A complex geopolymer with dyeing sludge and fly ash was prepared with sodium silicate as activator. The molecular structure, phase, morphology, compressive strength and heavy metals leaching concentration were investigated and a kind of paving block with this geopolymer was trialproduced. The results show that the incorporation of dyeing sludge promotes geopolymerization and the micromorphology of its colloidal material expands and becomes more diffuse. Calcium compound gel, ettringite and sodium sulfate crystals were discovered in the geopolymer matrix. The compressive strength increases first and then decreases with the increase of the content of dyeing sludge, reaching its maximum with 10% of dyeing sludge. The compressive strength, water absorption and frost resistance of the trial-produced paving blocks, which are red because of the hematite in the calcined dyeing sludge, meet the minimum requirements, and the leaching concentration of heavy metals is below the lower limit specified in the standard.
出处
《非金属矿》
CAS
CSCD
北大核心
2015年第4期71-74,共4页
Non-Metallic Mines
基金
绍兴市科技局公益性技术应用研究计划项目(2013B70030)
