基于分形理论超细粉煤灰微珠低密度水泥浆的制备  

Preparation of Low-density Slurry Lightened with Ultra-fine Fly Ash Beads Based on Fractal Theory

作　　者：王杰[1] 姚晓[1] 宋元洪 华苏东[1] 黄永洪[3] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009 [2]渤海钻探工程公司第一固井分公司,任丘062550 [3]江苏石油勘探局钻井处,扬州225261

出　　处：《硅酸盐通报》2011年第2期389-393,共5页Bulletin of the Chinese Ceramic Society

基　　金：江苏省企业博士基金资助项目(BK2009666)

摘　　要：本文通过浮选脱碳、超细分选方法得到D50为4.66μm的超细粉煤灰微珠,利用分形理论优化超细粉煤灰微珠、G级水泥、硅灰配比,制备了密度为1.40 g/cm3低密度水泥浆,评价了该水泥浆沉降稳定性及水泥石力学性能。研究结果表明:该水泥浆沉降稳定性好,50℃和80℃下该水泥石早期抗压强度均高于相同密度漂珠体系水泥石。该水泥石80℃×1 d条件下的有害孔所占比例为10.1%,而相同密度漂珠体系的有害孔比例为65.9%,由此可见分形理论设计的三元体系颗粒级配合理,有效降低了有害孔含量,有利于水泥石早期抗压强度的发展。By carbon-removal flotation and superfine classification process,ultra-fine fly ash beads with D50 =4.66 μm were selected.After particle ratio optimization with fractal theory model on ultra-fine beads,cement and silica fume,the low density cement slurry of 1.40 g/cm3 was developed.The results showed that ultra-fine beads lightened cement stone,cured either at 50 ℃ or 80 ℃,has higher early strength and setting stability than slurry lightened with floating beads.Mercury intrusion porosity（MIP） revealed that the proportion of harmful porosity of ultra-fine fly ash beads cement stone was 10.1% after 1 d curing at 80 ℃,while the proportion of the same density of floating sphere cement stone was 65.9%.It indicated that the fractal theory design did optimize the particle distribution of low density cement stone,reduce a smaller harmful porosity and improve early compressive strength.

关 键 词：超细粉煤灰微珠 分形理论 低密度水泥浆 

分 类 号：TQ172[化学工程—水泥工业]