矿物掺合料作为砂浆细集料的水化产物与光谱性能研究  

Stuay of Mineral Admixtures as Fine Aggregate on Hydration Products and Spectral Performance of Mortar

作　　者：吴福飞[1,2] 董双快[1] 赵振华[1] 宫经伟[2] 侍克斌[2] WU Fu-fei;DONG Shuang-kuai;ZHAO Zhen-hua;GONG Jing-wei;SHI Ke-bin(School of Materials and Architectural Engineering Guizhou Normal University, Guiyang 550025,China;College of Civil and Hydraulic Engineering,Xinjiang Agricultural University,Urumqi 830052,China)

机构地区：[1]贵州师范大学材料与建筑工程学院,贵州贵阳550025 [2]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052

出　　处：《光谱学与光谱分析》2018年第9期2853-2859,共7页Spectroscopy and Spectral Analysis

基　　金：贵州师范大学2016年博士科研启动项目(0517073);国家自然科学基金项目(51541909);贵州科技厅-贵州师范大学联合基金项目【黔科合LH字[2017]】7351号;贵州省教育厅青年科技人才成长项目(2018)资助

摘　　要：粉煤灰、锂渣和钢渣作为工业废渣,等质量替代水泥时其利用率往往较低,为了大量地使用这些工业废渣。采用X射线单晶衍射仪、同步热分析仪、傅里叶红外光谱仪和电镜扫描分析方法,研究了锂渣、粉煤灰和钢渣替代细集料后砂浆的水化产物、光谱特性、微观形貌,并探讨了砂浆抗折/抗压强度随替代率(0%,30%,50%,70%和100%)增长的变化规律。研究结果表明:四种浆体的水化产物主要为CSH凝胶、Ca(OH)_2、少量的AFt和未水化的颗粒(Al_2O_3,SiO_2),其中水泥-锂渣浆体、水泥-粉煤灰浆体、水泥-钢渣浆体中的未水化颗粒还含有一定的Li_2O·Al_2O_3·SiO_2,Ca_(1.56)SiO_(3.5)·xH_2O和RO phas。四种浆体以3467,3 438,2 923,2 348,1 638,1 429,1 111,1 000,768,696和462cm^(-1)为特征峰,但其峰强有所不同,其活性也不同,参与二次水化反应的程度也不同,因此,水泥-钢渣浆体中Ca(OH)_2的含量明显高于水泥-粉煤灰浆体和水泥-锂渣浆体的现象;但不管是矿物掺合料替代水泥还是细集料,都在浆体中发挥着火山灰活性和填充作用。含三种100%矿物掺合料砂浆的抗折强度和抗压强度均高于纯水泥砂浆,分别(锂渣、粉煤灰和钢渣)约高37.77%/51.88%,14.71%/11.70%,91.95%/34.88%,但其达到峰值的掺量不同。因此,采用矿物掺合料替代细集料是可行的,能大幅度提高工业废渣在混凝土行业中的使用,且能达到节能减排的效果。Fly ash,lithium slag and steel slag as industrial waste,replace quality cement to prepare cement mortar and concrete,but its utilization is often low,sousing these industrial waste in large quantities by using X-ray diffraction(XRD),thermal analyzer,Fourier infrared spectrometer and scanning electron microscope analysis method,we studied the hydration products,spectral performanceand microstructure of mortar after mineral admixtures as fine aggregate,and the change laws of mortar strength with the replacement rate(0%,30%,50%,70%and 100%)were analyzed.Test results showed that the hydration products wereCSH gel,Ca(OH)2,a small amount of AFt and Four kinds of slurry hydrationproducts mainly for CSH gel,Ca(OH)2,a small amount of AFt and unhydrated particles(Al 2O 3 and SiO 2)for cement paste,cement-lithium slag paste,cement-fly ash paste,cement-steel slag paste,which contain a certain Li 2O·Al 2O 3·SiO 2,Ca 1.56 SiO 3.5·x H 2O,and RO phase,respectively.Characteristic peak was 3 467,3 438,2 923,2 348,1 638,1429,1 111,1 000,768,696 and 462 cm-1 for four paste,but its strong peak was different and activity was also different,which was involved in thelevel of secondary hydration reaction is also different,so the content of Ca(OH)2 in cement-steel slag paste was significantly higher than cement-lithium slag paste and cement-fly ash paste.It played volcanic activity and filling effect when mineral admixtures replaced cement or fine aggregate.The flexural strength and compressive strength of mortar with 100%mineral admixture(lithium slag,fly ash and steel slag)were higher than pure cement mortar,it was about 37.77%/51.88%,14.71%/11.70%,14.71%/34.88%,respectively,But the flexural strength and compressive strength reached the maximum when the dosage of mineral admixtures was different.Therefore,mineral admixtures as fine aggregate of mortar were feasible,which can greatly improve the use of industrial waste in the concrete industry,and can achieve the result of energy conservation and emissions reduction.

关 键 词：矿物掺合料 细集料 X射线衍射 扫描电镜 热重分析 光谱特性 

分 类 号：TU528.01[建筑科学—建筑技术科学]