摘要
轻质底层抹灰石膏具有良好的防火保温性能,与钢结构复合时,由于钢基层致密不吸水,其与钢基层交接面较难干燥,会导致二者之间粘结强度较低,为此,以夏季杭州地区为例,开展了轻质底层抹灰石膏在钢结构表面含水率下降规律及不同含水率下与钢结构的拉伸粘结强度试验研究。结果显示,轻质底层抹灰石膏经过5~8 d,含水率降低到10%以下,最终稳定在3%~5%;轻质底层抹灰石膏含水率大于20%时拉伸粘结强度较小,含水率在10%~20%时拉伸粘结强度为0.1 MPa左右,含水率小于10%时,拉伸粘结强度平均值在0.3 MPa以上。
The lightweight gypsum plaster for base coating has good fire protection performance.When it is compounded with steel structure,because the steel base is dense and does not absorb water,the interface between it and steel base is difficult to dry,which will lead to low bond strength between them.Therefore,this paper takes Hangzhou area in summer as an example to carry out the experimental study of water content decline law of lightweight gypsum plaster for base coating on the surface of steel structure and the tensile bond strength of steel structure under different moisture content.The results show that after 5~8 days,the moisture content of lightweight gypsum plaster for base coating is reduced to below 10%,and finally it is stable at about 3%~5%;when the moisture content of lightweight gypsum plaster for base coating is more than 20%,the tensile bond strength is small,when the moisture content of light bottom plastering gypsum is between 10%~20%,the average tensile bond strength is 0.1 MPa,when the moisture content of gypsum is less than 10%,the average tensile bond strength is above 0.3 MPa.
作者
陈勇敢
姜民
钱晓倩
胡立黎
CHEN Yonggan;JIANG Min;QIAN Xiaoqian;HU Lili(HANGXIAO Steel Structure Co.Ltd.,Hangzhou 310003,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)
出处
《新型建筑材料》
2021年第2期85-87,共3页
New Building Materials
基金
国家重点研发计划项目(2017YFC0703801、2018YFC0807602)
浙江省重点研发计划项目(2018C03033-1)。
关键词
轻质底层抹灰石膏
含水率
拉伸粘结强度
钢结构
lightweight gypsum plaster for base coating
moisture content
tensile bond strength
steel structure
