高钙粉煤灰地质聚合物的制备及耐久性研究
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摘要
以新疆某电厂高钙粉煤灰为原料,水玻璃为碱激发剂制备了高钙粉煤灰地质聚合物胶凝材料。研究了水玻璃掺量、水胶比、水玻璃模数等对高钙粉煤灰地质聚合物抗压强度的影响,并对制备的聚合物材料进行了耐久性研究。结果表明,以高钙粉煤灰为原料,水玻璃(模数为1.1)掺量为8%、水胶比0.37、标准养护条件下,制备的高钙粉煤灰地质聚合物3 d、7 d和28 d抗压强度值分别为23.0 MPa、33.3 MPa与51.7 MPa。对所制备的地质聚合物进行耐久性研究表明,高钙粉煤灰地质聚合物所有龄期抗压强度均优于42.5水泥胶砂的强度,同时120 d龄期时能够到达83.3 MPa的高强度。
A high-calcium fly ash geopolymer cementitious material was prepared by using high-calcium fly ash from a power plant in Xinjiang and sodium silicate as an alkali activator. This paper studied the effects of water glass content,water-binder ratio and water glass modulus on the compressive strength of high-calcium fly ash geopolymer and the durability of the prepared polymer materials. The results showed that the optimal conditions are as follows: high calcium fly ash of 100%,sodium silicate content of 8% with modulus of 1. 1 and water/binder ratio of 0. 37. The strength values of the prepared geopolymer samples after 3,7 and 28 days were 23. 0 MPa and 33. 3 MPa,and51. 7 MPa,respectively. Durability studies showed that the strength value of geopolymers could reach83. 3 MPa after 120 days,which was greater than that of the 42. 5 cement mortar.
A high-calcium fly ash geopolymer cementitious material was prepared by using high-calcium fly ash from a power plant in Xinjiang and sodium silicate as an alkali activator. This paper studied the effects of water glass content,water-binder ratio and water glass modulus on the compressive strength of high-calcium fly ash geopolymer and the durability of the prepared polymer materials. The results showed that the optimal conditions are as follows: high calcium fly ash of 100%,sodium silicate content of 8% with modulus of 1. 1 and water/binder ratio of 0. 37. The strength values of the prepared geopolymer samples after 3,7 and 28 days were 23. 0 MPa and 33. 3 MPa,and51. 7 MPa,respectively. Durability studies showed that the strength value of geopolymers could reach83. 3 MPa after 120 days,which was greater than that of the 42. 5 cement mortar.
引文
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[8]Hermassi M,Valderrama C,Moreno N,et al.Fly ash as reactive sorbent for phosphate removal from treated waste water as a potential slow release fertilizer[J].Journal of Environmental Chemical Engineering,2017,5(1):160-169.
[9]Ferrero F.TOC removal from methylene blue aqueous solutions by adsorption and oxidation in the presence of coal fly ash[J].Desalination&Water Treatment,2015,57(34):1-5.
[2]易龙生,齐莉娜,李来顺,等.高强度等级粉煤灰水泥的试验研究[J].非金属矿,2015(4):31-34.
[3]王春雪,刘泽,孔凡龙,等.钢渣-粉煤灰基地质聚合物的制备及性能研究[C]//2015年第一届固废处理与生态材料学术交流会论文集.北京:2015:42-46.
[4]于谦.天然高钙粉煤灰的特性及其应用研究[J].矿产保护与利用,1997(3):48-52,56.
[5]李益进,孙鑫鹏,尹健.超细粉煤灰对高性能混凝土耐久性影响研究[J].西安建筑科技大学学报(自然科学版),2010(4):521-525.
[6]刘坚.粉煤灰在矿山充填中的试验研究[J].矿产保护与利用,2003(5):43-44.
[7]曹长伟,张文献,王雁飞.高掺量粉煤灰混凝土路面应用性能的试验研究[J].同济大学学报(自然科学版),2007(1):50-55.
[8]Hermassi M,Valderrama C,Moreno N,et al.Fly ash as reactive sorbent for phosphate removal from treated waste water as a potential slow release fertilizer[J].Journal of Environmental Chemical Engineering,2017,5(1):160-169.
[9]Ferrero F.TOC removal from methylene blue aqueous solutions by adsorption and oxidation in the presence of coal fly ash[J].Desalination&Water Treatment,2015,57(34):1-5.