电石渣对CO_(2)拌和水泥浆性能及固碳效能的影响  

Effect of Carbide Slag Addition on Properties and Carbon Sequestration Efficiency of Fresh Cement Slurry Mixed with CO_(2)

作　　者：闵前燊 辜涛 何波[1] 魏仁杰 刘川北[1] 张礼华[1] 刘来宝[1] MIN Qianshen;GU Tao;HE Bo;WEI Renjie;LIU Chuanbei;ZHANG Lihua;LIU Laibao(School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China;State Key Laboratory of Green Building Materials,Beijing 100024,China)

机构地区：[1]西南科技大学材料与化学学院,四川绵阳621010 [2]绿色建筑材料国家重点实验室,北京100024

出　　处：《材料导报》2024年第23期98-103,共6页Materials Reports

基　　金：绿色建筑材料国家重点实验室开放基金(2022GBM08);四川省自然科学基金青年项目(2023NSFSC0931);四川省重点研发项目(2023YFS0360);国家自然科学基金(52178254);西南科技大学自然科学基金(22zx7131)。

摘　　要：为提高CO_(2)直接拌和水泥基材料的固碳效能,以电石渣作为增强固碳材料,研究了电石渣和CO_(2)对新拌水泥净浆的流动度、凝结时间、抗压强度、固碳量和固碳效率等性能的影响。结果表明,电石渣掺入水泥浆体中会降低浆体流动度,加速浆体凝结,降低水泥石各个龄期的抗压强度。通入CO_(2)会进一步降低浆体的流动度,可延长浆体的凝结时间,水泥石抗压强度也有所提高。电石渣的掺入能够提高CO_(2)拌和水泥净浆的固碳量和固碳效率,当电石渣替代水泥用量为15%(质量分数),时固碳量最高且为6.95%,当电石渣掺量为10%时,固碳效率最佳,可达13.03%。研究结论旨在为建立低碳水泥基材料制备和电石渣资源化协同利用新途径提供参考。In order to improve the carbon sequestration efficiency of cement-based materials directly mixed with CO_(2),the effects of carbide slag and CO_(2) on the fluidity,setting time,compressive strength,carbon sequestration amount and carbon sequestration efficiency of cement paste is studied by adding carbide slag into fresh cement slurry as an enhanced carbon sequestration material.The results show that the addition of carbide slag can reduce the fluidity of the cement slurry,and accelerate the setting time of the slurry,and also reduce the strength of the cement mortar specimen in different curing ages.When CO_(2) is injected into the slurry,the fluidity of the slurry is further reduced but the setting time of the slurry is delayed and the compressive strength of cement is improved.When carbide slag is mixed with CO_(2),the carbon sequestration amount and carbon sequestration efficiency of cement paste can be improved.When the carbide slag content is 15%to cement,the carbon sequestration amount is the highest,which reaches 6.95%.When the carbide slag content is 10%to cement,the carbon sequestration efficiency is the hig-hest,which can reach 13.03%.The purpose of this work is to provide reference for the establishment of a new approach for the preparation of low-carbon cement-based materials and the collaborative utilization of carbide slag resources.

关 键 词：电石渣 CO_(2)拌和水泥浆 抗压强度 固碳效能 

分 类 号：X70[环境科学与工程—环境工程]