粉煤灰-偏高岭土基地质聚合物发泡材料的制备与表征
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摘要
本文以粉煤灰、偏高岭土、氢氧化钠、水玻璃为主要原料,选取3种不同的发泡剂在低温下通过碱激发反应制备了粉煤灰-偏高岭土基地质聚合物,研究了发泡剂的种类及其含量对多孔地质聚合物的孔结构和性能的影响,并对材料的热稳定性和结构进行了测试观察分析。研究结果表明:相比于铝粉和过硼酸钠,双氧水的发泡效果更好;地质聚合物的最佳制备工艺条件为双氧水含量0. 5%,养护温度40℃,养护湿度70%,养护时间7 d;所得到的地质聚合物的体积密度为0. 985 g/cm~3,抗压强度为8. 9 MPa,导热系数为0. 10 W/(m·K),具有很好的隔热保温效果。
The alkali activated fly ash-metakaolin based geopolymeric foaming materials were prepared at low temperature by use of fly ash,metakaolin,sodium hydroxide,sodium silicate as the main raw material.The effect of the types and contents of foaming agent on the pore structure and properties of the porous geopolymer were studied,and the thermal stability and structure were also investigated.Compared to the aluminum and sodium borate,the foaming effect of hydrogen peroxide was better.The properties of geopolymeric foaming materials prepared in ths paper were with bulk density of 0.985 g/strength of 8.9 MPa,lowest thermal conductivity of 0.10 W/(m·K)and good thermal insulation effect,when the content of hydrogen peroxide was 0.5%,the conservation temperature was 40℃,conservation humidity was 70% and conservation time was 7 d.
The alkali activated fly ash-metakaolin based geopolymeric foaming materials were prepared at low temperature by use of fly ash,metakaolin,sodium hydroxide,sodium silicate as the main raw material.The effect of the types and contents of foaming agent on the pore structure and properties of the porous geopolymer were studied,and the thermal stability and structure were also investigated.Compared to the aluminum and sodium borate,the foaming effect of hydrogen peroxide was better.The properties of geopolymeric foaming materials prepared in ths paper were with bulk density of 0.985 g/strength of 8.9 MPa,lowest thermal conductivity of 0.10 W/(m·K)and good thermal insulation effect,when the content of hydrogen peroxide was 0.5%,the conservation temperature was 40℃,conservation humidity was 70% and conservation time was 7 d.
引文
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[3]Majidi B.Geopolymer technology,from fundamentals toadvanced applications:a review[J].Materials Technology,2009,24(2):79-87.
[4]Joseph D.Ancient and modern concretes:what is the real difference?[J].Concrete International,1987,9(12):28.
[5]Daeik K,Hsuan-Ting L,George V C,et al.Geopolymer formation and its unique properties[J].Environmental Geology,2006,51(1):103-111.
[6]Wang Hongling,Li Haihong,Yan Fengyuan.Synthesis and mechanical properties of metakaolinite based geopolymer[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2005,268(1):1-6.
[7]王栋民,崔勇,李端乐,等.粉煤灰基地质聚合物发泡材料的性能与微观结构[J].矿业科学学报,2017,2(2):175-182.Wang Dongmin,Cui Yong,Li Duanle,et al.Microstructure and properties of coal fly-ash-based foam geopolymer[J].Journal of Mining Science and Technology,2017,2(2):175-182.
[8]崔勇,李端乐,刘泽,等.含Si O2气凝胶粉煤灰基发泡地质聚合物的性能及微观结构[J].新型建筑材料,2017,44(7):115-118.Cui Yong,Li Duanle,Liu Ze,et al.Study on microstructure and properties of Si O2aerogel blended coal fly ashbased foam geopolymer[J].New Building Materials,2017,44(7):115-118.
[9]吴浩,管学茂.土聚水泥的研究现状及应用发展前景[J].水泥工程,2004(2):1-6.Wu Hao,Guan Xuemao.Study state of geopolymeric cement and the development of its applicaition[J].Cement Engineering,2004(2):1-6.
[10]Cui Xuemin,Liu Leping,Zheng Guangjian,et al.Characterization of chemosynthetic Al2O3-2Si O2geopolymers[J].Journal of Non-Crystalline Solids,2010,356(2):72-76.
[11]朱国振,汪长安,高莉.地质聚合物发泡材料的制备及其性能研究[J].新型建筑材料,2013,40(12):41-45.Zhu Guozhen,Wang Changan,Gao Li.Preparation and properties of geopolymeric foaming materials[J].New Building Materials,2013,40(12):41-45.
[12]赵静静,张晓黎,王喜焕,等.微孔发泡聚合物基导电复合材料的研究进展[J].高分子通报,2017(3):33-41.Zhao Jingjing,Zhang Xiaoli,Wang Xihuan,et al.Research progress of microcellular foamed polymer-based conductive composites[J].Polymer Bullitin,2017(3):33-41.
[13]Masi G,Rickard W D A,Vickers L,et al.Acomparison between different foaming methods for the synthesis of light weight geopolymers[J].Ceramics International,2014,40(9):13891-13902.
[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.Wang Yaguang,Han Fenglan,Zhao Shizhen,et al.Study on preparation and compressive strength of fly ash geopolymer[J].New Building Materials,2017,44(10):12-16.
[15]王顺风,马雪,杜浪,等.粉煤灰粒径对地质聚合物孔结构及性能的影响[J].非金属矿,2017,40(5):5-8.Wang Shunfeng,Ma Xue,Du Lang,et al.Effect of particle size of fly ash on pore structure and properties of geopolymers[J].Non-Metallic Mines,2017,40(5):5-8.