室温碱激发低钙粉煤灰地质聚合物配比试验研究

摘要/Abstract

摘要： 为得到室温下粉煤灰与碱激发剂质量比、水玻璃与氢氧化钠溶液质量比和氢氧化钠溶液摩尔浓度对粉煤灰地质聚合物力学性能的影响,以低钙粉煤灰为原料,制备了地质聚合物胶凝材料。采用正交试验方法,分析粉煤灰地质聚合物抗压强度,探讨碱激发剂配比对粉煤灰地质聚合物力学性能的影响,结合SEM、XRD和FTIR对试样进行表征,并对该材料的应力-应变曲线进行了研究。结果表明:粉煤灰地质聚合物的抗压强度随着激发剂掺量的减少而增大,水玻璃在激发剂中的比值与粉煤灰地质聚合物的抗压强度呈现正相关,其中粉煤灰与碱激发剂质量比为1.8,水玻璃与氢氧化钠溶液质量比为2.5且氢氧化钠溶液的浓度为10 mol/L时,120 d龄期的抗压强度可达51.98 MPa。对应力-应变曲线分析得出,在一定程度上,激发剂的掺入量对粉煤灰地质聚合物的破坏应变和弹性模量有较大影响。SEM、XRD和FTIR分析表明随着养护时间增长,胶凝材料体系内结构更致密,生成了更多的硅铝酸盐凝胶。

关键词: 室温, 粉煤灰地质聚合物, 正交试验, 抗压强度, 应力-应变曲线

Abstract: In order to investigate the influence of the mass ratio of fly ash to alkali activator, the mass ratio of water glass to sodium hydroxide solution, and the molar concentration of sodium hydroxide solution on the mechanical properties of fly ash geopolymer at room temperature, low-calcium fly ash were used as raw material to prepare geopolymer cementing material. Orthogonal test method was used to analyze the compressive strength of fly ash geopolymers and to discuss the influence of the ratio of alkali activator on the mechanical properties of fly ash geopolymers. SEM, XRD and FTIR were also carried out to characterize the geopolymer samples, and the stress-strain relationship of the material was studied. The results show that the compressive strength of fly ash geopolymer increases with the decrease of activator content, and the ratio of water glass in activator is positively correlated with the compressive strength. When the mass ratio of fly ash to alkali activator is 1.8, the mass ratio of water glass to sodium hydroxide solution is 2.5, and the concentration of sodium hydroxide solution is 10 mol/L, the compressive strength of the obtained geopolymer after curing for 120 d reaches to 51.98 MPa. The stress-strain curves show that the amount of activator has a greater impact on the failure strain and elastic modulus of fly ash geopolymer to some extent. Moreover, the results of SEM, XRD and FTIR show that the structure of the cementitious material system become denser with the increase of curing time, and more aluminosilicate gels are mainly generated.

Key words: room temperature, fly ash geopolymer, orthogonal test, compressive strength, stress-strain curve

中图分类号:

TU528

魏威, 高彦斌, 陈忠清, 朱文韬, 朱泽威. 室温碱激发低钙粉煤灰地质聚合物配比试验研究[J]. 硅酸盐通报, 2020, 39(12): 3889-3896.

WEI Wei, GAO Yanbin, CHEN Zhongqing, ZHU Wentao, ZHU Zewei. Experimental Study on Proportion of Room Temperature Alkali-Activated Low-Calcium Fly Ash Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3889-3896.

参考文献

[1] 王若超.粉煤灰高附加值绿色化综合利用的研究[D].沈阳:东北大学,2013:129-133.
[2] Davidovits J. Geopolymers and geopolymeric materials[J]. Journal of Thermal Analysis, 1989, 35(2): 429-441.
[3] 约瑟夫·戴维德维斯著.王克俭译.地聚合物化学及应用[M].北京:国防工业出版社,2011:124-146.
[4] 侯云芬.粉煤灰基地质聚合物[M].北京:化学工业出版社,2014: 208-209.
[5] Habert G, de Lacaillerie J B, Roussel N. An environmental evaluation of geopolymer based concrete production: reviewing current research trends[J]. Journal of Cleaner Production, 2011, 19(11): 1229-1238.
[6] McLellan B C, Williams R P, Lay J, et al. Costs and carbon emissions for geopolymer pastes in comparison to ordinary portland cement[J]. Journal of Cleaner Production, 2011, 19(9-10): 1080-1090.
[7] Palomo A, Fernández-Jiménez A, Kovalchuk G, et al. OPC-fly ash cementitious systems: study of gel binders produced during alkaline hydration[J]. Journal of Materials Science, 2007, 42(9): 2958-2966.
[8] van Jaarsveld J G S, van Deventer J S J, Lukey G C. The characterisation of source materials in fly ash-based geopolymers[J]. Materials Letters, 2003, 57(7): 1272-1280.
[9] 侯云芬,王栋民,周文娟,等.粉煤灰中氧化钙对矿物聚合物抗压强度的影响[J].武汉理工大学学报,2009,31(23):19-22.
[10] Panias D, Giannopoulou I, Perraki T, et al. Effect of synthesis parameters on the mechanical properties of fly ash-based geopolymers[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2007, 301(1-3): 246-254.
[11] 饶绍建,王克俭.高温短期养护对低钙粉煤灰地质聚合物性能的影响[J].材料导报, 2011,25(17):477-479.
[12] 贾屹海.Na-粉煤灰地质聚合物制备与性能研究[D].北京:中国矿业大学(北京),2009:12-17.
[13] Mustafa A B A M, Kamarudin H, Khairul N I, et al. Correlation between Na₂SiO₃/NaOH ratio and fly ash/alkaline activator ratio to the strength of geopolymer[J]Advanced Materials Research, 2012, 341: 189-193.
[14] 王亚光,韩凤兰,赵世珍,等.粉煤灰地质聚合物的制备及其抗压强度研究[J].新型建筑材料,2017,44(10):12-16.
[15] Alshaaer M, Slaty F, Khoury H, et al. Development of low-cost functional geopolymeric materials[J]. Ceramic Transactions, 2010, 222: 159-167.
[16] 孙佳,吕学森,贺艳,等.碱激发矿渣基地聚物中钠离子迁移与分布研究[J].广西大学学报(自然科学版),2019,44(2):561-569.
[17] Lizcano M, Gonzalez A, Basu S, et al. Effects of water content and chemical composition on structural properties of alkaline activated metakaolin-based geopolymers[J]. Journal of the American Ceramic Society, 2012, 95(7): 2169-2177.
[18] Part W K, Ramli M, Cheah C B. An overview on the influence of various factors on the properties of geopolymer concrete derived from industrial by-products[J]. Construction and Building Materials, 2015, 77: 370-395.
[19] 施惠生,夏明,郭晓潞.粉煤灰基地聚合物反应机理及各组分作用的研究进展[J].硅酸盐学报,2013,41(7):972-980.
[20] Reddy M S, Dinakar P, Rao B H. Mix design development of fly ash and ground granulated blast furnace slag based geopolymer concrete[J]. Journal of Building Engineering, 2018, 20: 712-722.
[21] 杨南如,岳文海.无机非金属材料图谱手册[M].武汉:武汉工业大学出版社,2000:572-590.
[22] 焦向科,曹志明,李涛,等.不同碱激发剂作用下稀土尾矿地聚物的抗压强度与泛霜程度研究[J].硅酸盐通报,2016,35(11):3819-3825.
[23] 柯昌君,江盼,吴维舟.粉煤灰蒸压活性的红外光谱研究[J].武汉理工大学学报,2009,31(4):35-39.
[24] 侯云芬,王栋民,李俏,等.水玻璃性能对粉煤灰基矿物聚合物的影响[J].硅酸盐学报,2008,36(1):61-64.