聚合铝对锂渣-水泥复合胶凝材料水化硬化特性的影响
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摘要
锂渣具有火山灰活性,可作为辅助性胶凝材料应用于水泥基材料中,但其较低的水化活性导致材料的力学性能和耐久性能下降。针对锂渣在复合胶凝材料中的低水化程度,本文采用一种无机高分子聚合铝作为激发剂来提升锂渣的水化反应活性,通过测定材料的胶砂强度、化学结合水量等宏观性能,并结合水化放热特性、水化产物矿物组成及背散射显微形貌等微观表征,分析了聚合铝对锂渣-水泥复合胶凝材料水化特性的影响及作用机理。结果表明:聚合铝的掺入显著提高锂渣-水泥复合胶凝材料28 d龄期的抗压强度和化学结合水含量,分别增长了26. 8%和5%;早期水化反应中,聚合铝的掺入加速了锂渣-水泥复合胶凝体系的矿物相溶解和晶体的生长,增加了水化产物的成核总量,水化产物中出现了大量的钙矾石、水化铝酸钙、氢氧化钙及非晶态水化凝胶;聚合铝的掺入促进了锂渣-水泥复合胶凝体系的水化和锂渣颗粒的溶解与侵蚀。
Lithium slag is used as a supplementary cementitious material in cement-based materials due to its pozzolanic activity,but its lower hydration activity leads to a decline in the mechanical properties and durability of the cement-based material. In this paper,for the low degree of hydration of lithium slag in composite cementitious materials,an inorganic polymer aluminum was used as an activator to improve the hydration activity of lithium slag. The effects and mechanism of polymeric aluminum on hydration hardening of lithium slag-cement composite cementitious materials were investigated through macro properties of compressive strength and non-evaporable water content,and micro characteristics of hydration heat,mineral composition of hydration products and BSE microscopic morphology. The results indicate that the addition of polymeric aluminum significantly improves the compressive strength and non-e-vaporable water content in the lithium slag-cement composite cementitious material,which increases26. 8% and 5% respectively in the 28 d period. In the early hydration,polymeric aluminum accelerates the mineral phase dissolution and crystal growth in the lithium slag-cement composite cementitious material,and increases the total nucleation of hydration products. A large number of ettringite,hydration calcium aluminates,calcium hydroxide and amorphous hydration gels appeare in the hydration products,which promote hydration of lithium slag-cement composite cementitious system,the dissolution and erosion of lithium slag particles.
Lithium slag is used as a supplementary cementitious material in cement-based materials due to its pozzolanic activity,but its lower hydration activity leads to a decline in the mechanical properties and durability of the cement-based material. In this paper,for the low degree of hydration of lithium slag in composite cementitious materials,an inorganic polymer aluminum was used as an activator to improve the hydration activity of lithium slag. The effects and mechanism of polymeric aluminum on hydration hardening of lithium slag-cement composite cementitious materials were investigated through macro properties of compressive strength and non-evaporable water content,and micro characteristics of hydration heat,mineral composition of hydration products and BSE microscopic morphology. The results indicate that the addition of polymeric aluminum significantly improves the compressive strength and non-e-vaporable water content in the lithium slag-cement composite cementitious material,which increases26. 8% and 5% respectively in the 28 d period. In the early hydration,polymeric aluminum accelerates the mineral phase dissolution and crystal growth in the lithium slag-cement composite cementitious material,and increases the total nucleation of hydration products. A large number of ettringite,hydration calcium aluminates,calcium hydroxide and amorphous hydration gels appeare in the hydration products,which promote hydration of lithium slag-cement composite cementitious system,the dissolution and erosion of lithium slag particles.
引文
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[19]王培铭,丰曙霞,刘贤萍.水泥水化程度研究方法及其进展[J].建筑材料学报,2005,8(6):646-652.Wang Peiming,Feng Shuxia,Liu Xianping.Research approaches of cement hydration degree and their development[J].Journal of Buliding Materials,2005,8(6):646-652.
[20]Feng X,Garboczi E J,Bentz D P,et al.Estimation of the degree of hydration of blended cement pastes by a scanning electron microscope point-counting procedure[J].Cement&Concrete Research,2004,34(10):1787-1793.
[2]翟梦怡,赵计辉,王栋民.锂渣粉作为辅助胶凝材料在水泥基材料中的研究进展[J].材料导报,2017,31(5):139-144.Zhai Mengyi,Zhao Jihui,Wang Dongmin.Applying lithium slag powders to cement-based materials as supplementary cementitous compont:an overview[J].Materials Review,2017,31(5):139-144.
[3]He Zhihai,Li Longyuan,Du Shigui.Mechanical properties,drying shrinkage,and creep of concrete containing lithium slag[J].Construction&Building Materials,2017,147:296-304.
[4]He Zhihai,Du Shigui,Chen Deng.Microstructure of ultra high performance concrete containing lithium slag[J].Journal of Hazardous Materials,2018,353:35-43.
[5]Chen Dan,Hu Xin,Shi Lu,et al.Synthesis and characterization of zeolite X from lithium slag[J].Applied Clay Science,2012,59/60(5):148-151.
[6]刘洪.基于抗压强度比指标的锂渣粉活性对比试验分析[J].商品混凝土,2011(6):37-40.Liu Hong.Comparative test of the activity of lithium slag powder based on the ratio of compressive strength[J].Ready-Mixed Concrete,2011(6):37-40.
[7]Jiang J Q.Development of coagulation theory and prepolymerized coagulants for water treatment[J].Separation&Purification Methods,2001,30(1):127-141.
[8]唐婉莹,翟宇峰,王连军,等.聚合氯化铝絮凝机理探讨[J].南京理工大学学报,1997,21(4):325-328.Tang Wanying,Zhai Yufeng,Wang Lianjun,et al.Astudy on coagulate mechanism of polyaluminium chloride[J].Journal of Nanjing University of Science and Technology,1997,21(4):325-328.
[9]祝战奎.锂渣复合渣高强高性能自密实混凝土研究[D].重庆:重庆大学,2007.
[10]陈伟,唐焱杰,田健,等.聚合铝改性磷石膏基超硫矿渣胶凝材料制备与性能研究[J].武汉理工大学学报,2016,38(2):1-6.Chen Wei,Tang Yanjie,Tian Jian,et al.Research on preparation and performance of poly-Al enhanced phosphorus gypsum based super-sulphated cement[J].Journal of Wuhan University of Technology,2016,38(2):1-6.
[11]Chen Wei,Li Bo,Li Qiu,et al.Effect of polyaluminum chloride on the properties and hydration of slag-cement paste[J].Construction&Building Materials,2016,124:1019-1027.
[12]尚建丽,张凯峰,赵世冉,等.钢渣胶凝活性评价方法的研究进展[J].材料导报,2012,26(7):128-130.Shang Jianli,Zhang Kaifeng,Zhao Shiran,et al.Development on evaluation methodology of cementitious activity of steel slag[J].Materials Review,2012,26(7):128-130.
[13]宁寻安,李凯,李润生,等.聚合氯化铝的红外光谱研究[J].环境化学,2008,27(2):263-264.Ning Xunan,Li Kai,Li Runsheng,et al.Infrared spectroscopic study of polyaluminum chloride[J].Environmental Chemistry,2008,27(2):263-264.
[14]Han Fanghui,Liu Rengguang,Wang Dongmin,et al.Characteristics of the hydration heat evolution of composite binder at different hydrating temperature[J].Thermochimica Acta,2014,586(8):52-57.
[15]孔祥明,卢子臣,张朝阳.水泥水化机理及聚合物外加剂对水泥水化影响的研究进展[J].硅酸盐学报,2017,45(2):274-281.Kong Xiangming,Lu Zichen,Zhan Chaoyang.Recent development on understanding cement hydration mechanism and effects of chemical admixtures on cement hydration[J].Journal of the Chinese Ceramic Society,2017,45(2):274-281.
[16]阎培渝,郑峰.温度对补偿收缩复合胶凝材料水化放热特性的影响[J].硅酸盐学报,2006,34(8):1006-1010.Yan Peiyu,Zheng Feng.Influence of temperature on the hydration heat evolution of shrinkage-compensating complex binders[J].Journal of the Chinese Ceramic Society,2006,34(8):1006-1010.
[17]Mattson S.Cataphoresis and the electrical neutralization of colloidal material.[J].Journal of Physical Chemistry,2002,32(10):1532-1552.
[18]石宁.碱-矿渣-锂渣胶凝材料研究[D].重庆:重庆大学,2005.
[19]王培铭,丰曙霞,刘贤萍.水泥水化程度研究方法及其进展[J].建筑材料学报,2005,8(6):646-652.Wang Peiming,Feng Shuxia,Liu Xianping.Research approaches of cement hydration degree and their development[J].Journal of Buliding Materials,2005,8(6):646-652.
[20]Feng X,Garboczi E J,Bentz D P,et al.Estimation of the degree of hydration of blended cement pastes by a scanning electron microscope point-counting procedure[J].Cement&Concrete Research,2004,34(10):1787-1793.