Abstract:Based on the tests of 60 blocks chosen from 3 masonry walls at random, this paper studied the differences of the rebound value for different options of resiliometers and blocks with or without ribbed position. And through 9 comparison tests of hollow concrete block masonry specimens by rebound method, this paper analyzed the relationship of rebound value of the blocks under different constraints, vertical load and concrete grouted. Based on the comparison and analysis of the experimental data, a general calculation formula of compressive strength for common concrete hollow brick in existing masonry was put forward. Confirmatory experimental results have shown the high accuracy of this formula, which can provide a basis for the revision of relevant standards.

Abstract:There are many problems in the engineering application of the current national standard and industrial standard of the rebound method for fired common brick, for instance, low accuracy, limitation of application and errors in citation. Based on the comparison of rebound testing method provided in 4 existing standards and on the mathematical statistical method, a general formula of the strength calculation for fired common brick in existing masonry was proposed, and the uniform provisions concerning the application of this method were made. The high accuracy of the general formula of strength calculation has been verified in the test organized by the Committee of National Standard GB 50315. The research will have reference value for site testing of masonry engineering, and will provide an important basis for the revision of the national standard GB 50315.

Abstract:The strength of natural stone materials is an important technical index in masonry construction. But its test is a complicated work and always need to be carried out in site immediately to judge if the stone material can be used. The rebound method has wi