论文部分内容阅读
国标GB2542-81《砌墙砖检验方法》规定:在测定普通粘土砖标号时,其抗压强度是将五块砖样切断或锯成两个半头砖,两层砖之间用水泥浆粘结,上、下两面也用水泥抹平制成试件,经3天养护后再进行测压。采用这种方法测定砖的强度费料,费时,技术难度大,试验设备造价高且不能立即得出性能结果。回弹法测定普通粘土砖标号是以非破损为原则,利用小型回弹仪测定普通粘土砖表面硬度(回弹值),以此推断砖标号。这种方法使用的仪器构造简单,价格便宜(0.075kgf·m小型回弹仪每台售价约150元),便于操作与维修。在我国中小型砖厂中推广这种方法具有现实意义。
The national standard GB2542-81 “Test method for masonry wall bricks” stipulates that when determining the number of ordinary clay bricks, the compressive strength is to cut or saw five bricks into two half head bricks, and the two layers of bricks are cemented with cement paste. , Upper and lower sides were also made of cement flattened specimens, after 3 days of conservation and then pressure testing. The use of this method to measure the strength and expense of bricks is time consuming, technically difficult, and the cost of test equipment is high and performance results cannot be obtained immediately. The method of rebound determination of ordinary clay bricks is based on the principle of non-breakage, using a small rebound tester to determine the surface hardness (rebound value) of ordinary clay bricks, in order to infer the brick number. The instrument used in this method is simple in construction and inexpensive (the 0.075kgf·m compact hammer is priced at about RMB 150 each) for ease of operation and maintenance. It is of practical significance to promote this method in small and medium brick factories in China.