改性低活性粉煤灰替代水泥胶结地下尾砂的研究  

Substitution of Modified Low-activity Fly Ash for Ordinary Portland Cement in Underground Cementing Tailings

作　　者：肖敏 刘建 朱泽文 代力 张恺 江璐 刘运华 XIAO Min;LIU Jian;ZHU Zewen;DAI Li;ZHANG Kai;JIANG Lu;LIU Yunhua(Project Construction Management Company,Jiangxi Communications Investment Group Co.,Ltd.,Nanchang 330200,China;Jiangxi Transportation Research Institute Co.,Ltd.,Nanchang 330200,China;Research and Development Center on Technogies and Equipment of Long-span Bridge Construction Minsistry of Transport,Nanchang 330200,China;Changjiang River Science Research Institute,Wuhan 430010,China;Ganzhou Communications Investment Group Co.,Ltd.,Ganzhou 341000,China)

机构地区：[1]江西省交通投资集团有限责任公司项目建设管理公司,南昌330200 [2]江西省交通科学研究院有限公司,南昌330200 [3]长大桥梁建设技术及装备交通运输行业研发中心,南昌330200 [4]长江科学院,武汉430010 [5]赣州交通投资集团有限公司,赣州341000

出　　处：《粉煤灰综合利用》2025年第2期6-10,共5页Fly Ash Comprehensive Utilization

基　　金：江西省交通运输厅科技项目(2021C0008,2022H0014,2022C0007);江西省自然科学基金资助项目(20202BABL214043);长江科学院中央级公益性科研院所基本科研业务费(CKSF2019507/CL、CKSF2023317/CL)。

摘　　要：粉煤灰作为一种掺合料常被用于水泥或混凝土中,但低钙粉煤灰因活性低而利用率不高。通过机械和化学联用方法改性低钙粉煤灰,研究利用改性后的粉煤灰替代部分地下充填水泥后对其抗压强度的影响。结果表明:当粉煤灰经活化处理后,替代部分水泥可显著提高其抗压强度;随着粉煤灰替代量从21.5%增至46.3%,改性低活性粉煤灰替代水泥胶结料试件的抗压强度逐渐提高,替代量为28.2%时抗压强度最大;当水泥替代量为28.2%、胶砂比为1∶4时,抗压强度达5.5 MPa,是同等条件下水泥胶结尾砂抗压强度的1.56倍;经计算成本可知,粉煤灰替代28.2%的水泥用量,可节约成本28.7%,具有良好的经济效益。Fly ash is often used as an admixture in cement or concrete,but low-calcium fly ash is underutilised due to its low activity.Low-calcium fly ash was modified by mechanical and chemical combination methods to study the effect on the compressive strength of the modified fly ash after replacing part of the underground filling cement.The results show that:when the fly ash is activated,replacing part of the cement can significantly improve its compressive strength;with the amount of fly ash substitution increased from 21.5%to 46.3%,the compressive strength of the specimens of the modified low activity fly ash substitution cement cement cementitious materials gradually increased,and the maximum compressive strength was achieved at the substitution of 28.2%;when the amount of cement substitution was 28.2%,and the ratio of glue and sand was 1∶4,the compressive strength reached 5.5 MPa,which is the same as that of cement cementitious end sands under the same conditions.It is 1.56 times of the compressive strength of cement cemented sand under the same conditions.After calculating the cost,it can be seen that fly ash replaces 28.2%of the cement dosage and saves 28.7%of the cost,which has good economic benefits.

关 键 词：低活性粉煤灰 改性 替代 普通水泥 地下胶结尾砂 

分 类 号：TU521.4[建筑科学—建筑技术科学]