Degradation of limestone calcined clay cement(LC^(3))mortars under sulfate attack  

作　　者：Cheng Yu Zhen Li Jiaping Liu 

机构地区：[1]State Key Laboratory of High Performance Civil Engineering Materials,Sobute New Materials Co.,Ltd,Nanjing 211103,China [2]School of Materials Science and Engineering,Southeast University,Nanjing 211189,China

出　　处：《Low-carbon Materials and Green Construction》2023年第1期34-47,共14页低碳材料与绿色建造（英文）

基　　金：supported in part by grants from National Natural Science Foundation of China(52278259).

摘　　要：Limestone Calcined Clay Cement(LC^(3)) is a newly proposed low-carbon cement,which can effectively reduce energy consumption and carbon emissions of the traditional cement industry without changing the basic mechanical properties of cement-based materials.In this study,the degradation process of mortar samples of limestone and calcined clay cementitious material under sulfate attack is studied by both macroscopic and microscopic analysis.The results show that compared with pure Portland cement,the addition of calcined clay and limestone can significantly reduce the expansion rate,loss of dynamic modulus and mass loss of mortar specimens under sulfate attack.The addition of calcined clay and limestone will refine the pore size distribution of mortar specimens,then inhibiting the diffusion of sulfate and formation of corrosive products,therefore leading to a significant improvement of the sulfate resistance.石灰石-煅烧粘土水泥是一种新型的低碳水泥体系,其力学性能与传统硅酸盐水泥相比,可以有效降低水泥生产过程的中的能耗与碳排放。本文采用宏观测试与微观表征相结合的方法,研究了石灰石-煅烧粘土水泥砂浆在硫酸盐侵蚀作用下的劣化规律,结果表明相较于纯硅酸盐水泥体系,掺入石灰石与煅烧粘土可以显著减少硫酸盐侵蚀作用下砂浆试件的膨胀率和动弹性模量损失,延缓砂浆试件的劣化过程。这主要是由于煅烧粘土与石灰石的加入会细化砂浆的孔隙结构,有效抑制硫酸盐向试件内部的传输与扩散,从而显著降低钙矾石、石膏等导致膨胀的侵蚀产物的生成,提升砂浆试件的抗硫酸盐侵蚀能力。

关 键 词：Limestone Calcined Clay Cement(LC^(3)) Sulfate attack Expansion Sulfate penetration profiles Corrosion product 

分 类 号：TQ172.1[化学工程—水泥工业]