低水化热低收缩3D打印建筑材料试验研究  

Experimental study on a 3D printing building material with low hydration heat and low shrinkage

作　　者：胡元元 马慧 姚亮 李荣 赵健 蔡晓亮 HU Yuanyuan;MA Hui;YAO Liang;LI Rong;ZHAO Jian;CAI Xiaoliang(Yaobai Special Cement Technology R&D Co.Ltd.,Xi'an 710100,China)

机构地区：[1]尧柏特种水泥技术研发有限公司,陕西西安710100

出　　处：《新型建筑材料》2023年第5期111-115,共5页New Building Materials

摘　　要：以水泥基材料打印的构筑物由于水泥水化热释放比较集中、自收缩及干燥收缩等原因普遍存在开裂问题,通过添加低水化热水泥、矿物掺合料以及硫铝型膨胀剂配制出低水化热低收缩3D打印建筑材料,采用压汞仪和SEM分析其孔隙率和微观结构。结果表明:低水化热水泥和硫铝型膨胀剂能明显降低3D打印建筑材料的水化热和收缩率,膨胀剂掺量为5%时,3、7、28 d水化热分别为128、164、176 J/g;收缩率最小,28 d后龄期干缩率基本稳定,90 d干缩率为0.0159%;孔隙率较小,微观结构致密;在合适材料配比及合适的可打印参数条件下,该材料具有优异的可打印性能。At present,the structures printed with cement-based materials generally have cracking problems due to the concentrated hydration heat release of cement,self shrinkage and drying shrinkage.In this paper,low hydration heat and low shrinkage 3D printing building materials are prepared by adding low hydration heat 3D cement,mineral admixture and sulfur aluminum expansion agent.The porosity and microstructure of the material were analyzed by mercury porosimeter and SEM.The results show that low hydration heat 3 d cement and sulphoaluminum expansion agent can significantly reduce the hydration heat and shrinkage of printing materials.When the content of expansion agent is 5%,the hydration heat of 3,7 and 28 d are 128,164 and 176 J/g respectively;the shrinkage rate is the smallest,the shrinkage rate is basically stable after 28 d and reaching 0.0159%at 90 d;The porosity is small and the microstructure is dense;Under the conditions of appropriate material ratio and appropriate printable parameters,the material has excellent printability.

关 键 词：低水化热 3D打印 收缩率 孔隙率 

分 类 号：TU528.04[建筑科学—建筑技术科学]