College of Mining Engineering, Taiyuan University of Technology

为了研究超细固废材料对超细硫铝酸盐水泥基注浆材料性能的影响,将较大掺量的超细固废粉煤灰与超细矿渣和超细硫铝酸盐水泥进行复配,宏观上对注浆材料的抗压强度、凝结时间、流动度、泌水率和膨胀率进行测试,微观上通过X射线衍射分析(XRD),傅里叶红外光谱分析(FTIR),热重分析和扫描电镜(SEM)等方式对水化产物进行分析,从宏观微观角度阐述2种超细固废材料对超细硫铝酸盐水泥性能的影响并分析机理,结果表明:①在超细硫铝酸盐水泥中掺入20%~40%的超细粉煤灰的基础上继续掺加0~20%的超细矿渣,随着超细固废材料的掺加,注浆材料的各龄期抗压强度逐渐降低,在超细粉煤灰掺量为20%时28d抗压强度最高为10.93MPa,而随超细固废材料的添加,各个固定超细粉煤灰掺量部分的注浆材料的凝结时间与流动度的变化并不相同,这两个性能主要受超细固废材料总占比的影响,随着总占比的升高,凝结时间先缩短后延长,流动度先减小后增大,都在总掺量为40%时达到极值,初终凝时间为40、50min左右,流动度为200mm左右;②抗压强度方面,由于超细矿渣的火山灰活性,在超细固废材料掺量相同时,超细矿渣占比高的注浆材料的后期抗压强度更高,而在流动度与凝结时间方面,不同超细固废材料的占比对注浆材料的影响不大;③超细固废材料掺入量的变化并没有改变水化产物的类型,注浆材料在1d内就快速反应,同时除钙矾石等水化产物外,还生成了单碳型碳铝酸钙。

To investigate the influence of ultrafine solid waste materials on the performance of ultrafine sulfoalumi⁃nate cement⁃based grouting material,a considerable amount of ultrafine solid waste fly ash was blended with ultrafineslag and ultrafine sulfoaluminate cement. The compressive strength,setting time,fluidity,water leakage rate and expan⁃sion rate of the grouting material were tested at the macro level. The hydration products were analyzed by X⁃ray dif⁃fraction analysis (XRD),Fourier infrared spectroscopy (FTIR),thermogravimetric analysis,and scanning electron mi⁃croscopy (SEM),and the effect of two types of ultrafine solid waste materials on the properties of ultrafine sulfoalumi⁃nate cement was described and the mechanism was analyzed from both macro and micro perspectives. The results dem⁃onstrated that:(1) On the basis of adding 20%-40% ultrafine fly ash into the ultrafine sulfoaluminate cement,0-20% ultrafine slag was incorporated. With the addition of ultrafine solid waste and mineral admixtures,the compressivestrength of the composite grouting material at each age gradually declined. When the content of ultrafine fly ash was20%,the 28d compressive strength reached the maximum of 10.93MPa. With the addition of ultrafine solid waste ma⁃terial,the reduction of the grouting materials in each fixed ultrafine fly ash content section was mainly attributed to di⁃lution,and the variations of setting time and fluidity were different. These two properties were mainly affectedby the total proportion of ultrafine solid waste material. With the increase of the total proportion,the coagulation timeinitially decreased and then prolonged,and the fluidity initially decreased and then increased,reaching the extremevalue when the total dosage was 40%. The initial and final coagulation time was approximately 40min and 50min,and the variation of the shortening and extension of the fluidity,which was about 200mm,was caused by the combinedaction of the nucleation effect and dilution effect. When the condensation time was shortened,the nucleation effectwas dominant,while the dilution effect was dominant when the condensation time was prolonged. The decrease in fluid⁃ity was mainly due to the high surface activity constraint of the ultrafine material. (2) Materials with a high content ofultrafine slag in terms of strength exhibited higher strength at the later stage due to pozzolanic activity. In termsof compressive strength,with the same content of ultrafine solid waste,grouting materials with a high proportion of ul⁃trafine slag had higher compressive strength at the later stage due to the pozzolanic activity of ultrafine slag. In terms offluidity and condensation time, grouting materials with a high proportion of ultrafine slag had higher compressivestrength. The proportion of different ultrafine mineral admixtures of solid waste had little influence on the grouting ma⁃terials. (3) The variation in the amount of ultrafine solid waste material did not alter the type of hydration products,and the composite grouting material reacted rapidly within 1 day. In addition to the hydration products such as ettring⁃ite,monocarbon calcium carboaluminate was also generated.

自然资源部矿山生态效应与系统修复重点实验室开放基金资助项目(MEER-2023-07);呼包鄂国家自主创新示范区建设科技支撑资助项目(2023XM08);“科技兴蒙”行动重点专项资助项目(2022EEDSKJXM010)

王朋飞,张明璇,王慧娴,等.超细固废(粉煤灰与矿渣)对超细硫铝酸盐水泥基注浆材料性能的影响研究[J].绿色矿山,2024,2(3):258-272.

WANG Pengfei,ZHANG Mingxuan,WANG Huixian,et al. Effect of Ultrafine solid waste ( fly ash and slag)on the properties of ultrafine sulphoaluminate cement based grouting materials and its mechanism[J].Journal of Green Mine,2024,2(3):258-272.