木质素磺酸钠改性Ca-LDH对水泥基材料性能的影响  

Effect of Ca-LDH Modified by Sodium Lignosulfonate on Properties of Cement-Based Materials

作　　者：陈梦竹 余林文[1] 袁慧慧 郑海兵 吴芳[1] 蔡渝新 李伟华 CHEN Mengzhu;YU Linwen;YUAN Huihui;ZHENG Haibing;WU Fang;CAI Yuxin;LI Weihua(College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China;School of Chemical Engineering and Technology,Sun Yat-Sen University,Zhuhai 519082,China;State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]中山大学化学工程与技术学院,珠海519082 [3]上海交通大学,海洋工程国家重点实验室,上海200240

出　　处：《硅酸盐通报》2021年第7期2152-2158,2173,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金青年基金(51708060)。

摘　　要：水滑石材料(LDHs)是一种新型多功能二维纳米材料,水泥的水化产物(AFm相)属于钙铝型水滑石系列,因LDHs优异的性能在建筑材料领域其应用前景广阔。本文以木质素磺酸钠作为改性剂,采用水热法合成了木质素磺酸盐改性LDHs(Ca-SLS-LDH),对比了改性前后Ca-LDH的表面形貌、平均颗粒尺寸和比表面积的差异,研究了不同掺量Ca-LDH对水泥凝结时间、砂浆流动性和力学性能的影响,并采用SEM、XRD和压汞仪(MIP)等方法对水泥水化产物组成和微观结构进行了分析。结果表明:Ca-SLS-LDH的平均颗粒尺寸更小,比表面积是未改性Ca-LDH的60多倍;当LDHs掺量不超过4%(质量分数)时,能够有效改善水泥石孔结构,促进水泥砂浆强度发展,掺量为6%(质量分数)时会导致孔隙率增大,强度降低。Layered double hydroxides(LDHs)are a new type of multifunctional two-dimensional nanomaterials.The hydration product(AFm phase)of cement belongs to the calcium-aluminum hydrotalcite series.Because of the excellent properties of LDHs,it has a broad application prospect in the field of building materials.Using sodium lignosulfonate as modifier,lignosulfonate modified LDHs(Ca-SLS-LDH)was synthesized by the hydrothermal synthesis method.The differences between the surface morphology,average particle size and specific surface area of Ca-LDH before and after modification were compared.The effects of different amounts of Ca-LDH on cement setting time,mortar fluidity and mechanical properties were studied,and the composition and microstructure of the cement hydration products were analyzed by SEM,XRD and mercury intrusion porosimetry(MIP).The results show that the average particle size of Ca-SLS-LDH is smaller,and the specific surface area is more than 60 times that of the unmodified Ca-LDH,when the content of LDHs does not exceed 4%(mass fraction),it can effectively improve the pore structure of the cement and promote the strength of the cement mortars,and the content of 6%(mass fraction)can cause the porosity to increase and the strength to decrease.

关 键 词：层状双金属氢氧化物 木质素磺酸钠 改性 水泥 强度 孔结构 

分 类 号：TU528[建筑科学—建筑技术科学]