【作者】 钟世云； 王峰； 贺鸿珠；

【Author】 ZHONG Shi-Yun~1 WANG Feng~1 HE Hong-Zhu~2 (1 Tongji University,Shanghai,200092;2 Shanghai Administration Office of Building Materials Development and Application,Shanghai,200032)

【机构】 同济大学；

【摘要】 本文研究了聚丙烯酸酯乳液(PAE)和1种聚合物粉末改性的抹面砂浆的抗开裂性能,并分析了影响开裂的因素。研究表明,不加PAE 的砂浆产生干燥收缩开裂,而PAE 掺量为20%的抹面砂浆也容易产生早期塑性开裂。在低水灰比的条件下,增大水灰比,可以减少砂浆的开裂。此外,对于薄抹灰砂浆,厚度在5mm 以上,比较容易出现开裂。更多还原

【Abstract】 This paper studies the anti-cracking properties of polyacrylic ester(PAE) emulsion and two kindsof polymer powder modified plastering mortar,and makes analysis of the facts which influent the crackingproperties.The results show that dry shrinkage cracking appears easily on the surface of the mortar withoutPAE and with high polymer content (20%) causes early plastic cracking.On the condition of lowwater-to-cement ratio,increasing water-to-cement ratio can decrease cracking of mortar.Moreover,as far asthin mortar is concerned,increasing the thickness can cause the increasing of probability of plastic cracking.Generally,the mortar layer whose thickness is more than 5 mm will easily crack.更多还原