新型块体墙材单体干燥收缩特征试验

Experimental Study on New Block Wall Material Monomer Drying Shrinkage Characteristics

目的通过试验探索新型块体墙材单体干缩特征及影响规律,为有效地检测及控制新型块体墙材砌体出现干缩裂缝提供依据.方法采取千分表快速试验方式研究不同初始含水率、几种环境相对湿度对三种不同新型块体墙材单体干缩性能的影响.结果新型块体墙材单体干缩值与含水率成正比例关系;初始含水率越高,则后期收缩值越大;新型块体墙材单体的平衡含水率是砌体干缩的重要指标,其与环境相对湿度成正比例关系,环境相对湿度发生变化时,新型块体墙材单体产生相应的干缩湿胀变形.结论较低的含水率能够有效减少砌筑后墙体的干缩、防止墙体开裂,理想的新型块体墙材单体砌筑时含水率应接近墙体在使用环境中的平衡含水率.

The aim of the study is to provide the basis for Online Measurement and controlling new block wall material dry shrinkage crack by the experimental exploration of new block wall material monomer drying shrinkage characteristics and the influence rules. The effects of different initial moisture content and several kinds of environmental relative humidity on three kinds of different new block wall material monomer dry shrinkage performance have been studied in the experiment. The results are found as following：the new block wall material monomer dry shrinkage value is proportional to the moisture content; the higher the initial moisture content,the bigger the later dry shrinkage value is;the new block wall material monomer＇s e- quilibrium moisture content is proportional to the environmental relative humidity which is the important index of the masonry dry shrinkage;when the environmental relative humidity changes, the dry shrinkage and wet-expansion deformation of the new block wall material monomer occurs. The conclusion is that the low moisture content can reduce the dry shrinkage of the wall after build-up and prevent wall＇s crack effectively, and the ideal wall material monomer＇s moisture content should approach the equilibrium moisture content of wall application environment.