硫铝酸钙膨胀剂与氧化镁膨胀剂对丁苯乳液改性砂浆性能的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (7): 2244-2250.

硫铝酸钙膨胀剂与氧化镁膨胀剂对丁苯乳液改性砂浆性能的影响

魏阔, 刘斯凤

同济大学材料科学与工程学院,先进土木工程材料教育部重点实验室,上海 201804

收稿日期:2022-03-14 修回日期:2022-04-21 出版日期:2022-07-15 发布日期:2022-08-01
通讯作者: 刘斯凤,博士,副教授。E-mail:lsf@tongji.edu.cn
作者简介:魏阔(1997—),男,硕士研究生。主要从事水泥基材料的研究。E-mail:1145647937@qq.com
基金资助:
国家自然科学基金重点项目(U2040222)

Effects of Calcium Sulphoaluminate Expansion Agent and Magnesia Expansion Agent on Properties of Styrene-Butadiene Copolymer Dispersion Modified Mortar

WEI Kuo, LIU Sifeng

Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China

Received:2022-03-14 Revised:2022-04-21 Online:2022-07-15 Published:2022-08-01

摘要/Abstract

摘要： 本文研究了温度为20 ℃,相对湿度为90%(RH90%)和60%(RH60%)时,硫铝酸钙膨胀剂(CSA)与氧化镁膨胀剂(MEA)对丁苯乳液改性砂浆的工作性能、力学性能与收缩性能的影响。结果表明,丁苯乳液改性砂浆的流动度随着2种膨胀剂掺量的增加均先增大后降低。在RH90%与RH60%下,CSA掺量分别为水泥质量的6%与10%时,砂浆的抗折与抗压强度最高。2种相对湿度下,CSA都可有效降低砂浆干燥收缩;RH90%下掺8%MEA可提升砂浆抗折与抗压强度,亦可有效补偿砂浆后期干燥收缩;RH60%下掺8%MEA会降低砂浆抗折与抗压强度,且无法有效补偿砂浆的干燥收缩。

关键词: 丁苯乳液改性砂浆, 膨胀剂, 力学性能, 收缩性能, 硫铝酸钙膨胀剂, 氧化镁膨胀剂

Abstract: The effects of calcium sulphoaluminate expansive agent (CSA) and magnesium oxide expansive agent (MEA) on the workability, mechanical properties and shrinkage properties of styrene-butadiene copolymer dispersion modified mortar were studied at 20 ℃, relative humidity 90% (RH90%) and 60% (RH60%). The results show that the fluidity of styrene-butadiene copolymer dispersion modified mortar increases first and then decreases with the increase of the dosage of the two expansion agents. At 90%RH and RH60%, the mortar with CSA mass content of 6% and 10% has the highest flexural and compressive strength, respectively. CSA effectively reduces the drying shrinkage of mortar under two kinds of humidity. At 90%RH, 8%MEA improve the flexural and compressive strength of mortar, and also effectively compensate the drying shrinkage of mortar in later period. At RH60%, 8%MEA reduce the mortar flexural and compressive strength, and can not effectively compensate the dry shrinkage of mortar.

Key words: styrene-butadiene copolymer dispersion modified mortar, expansion agent, mechanical property, shrinkage property, calcium sulphoaluminate expansion agent, magnesia expansion agent

中图分类号:

TU528

魏阔, 刘斯凤. 硫铝酸钙膨胀剂与氧化镁膨胀剂对丁苯乳液改性砂浆性能的影响[J]. 硅酸盐通报, 2022, 41(7): 2244-2250.

WEI Kuo, LIU Sifeng. Effects of Calcium Sulphoaluminate Expansion Agent and Magnesia Expansion Agent on Properties of Styrene-Butadiene Copolymer Dispersion Modified Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2244-2250.

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