[问]《混凝土结构工程施工及验收规范》规定:在已浇筑的混凝土强度未达到1.2兆帕以前,不得在其上踩踏或安装模板及支架。为满足这一要求,确保混凝土工程质量,在施工过程中应该怎样测定混凝土强度是否达到1.2兆帕?请给予指导。(广西北海陈天裕)[答]有关混凝土强度1.2兆帕的规定是沿用前苏联早期的经验,并不是绝对数值。主要看混凝土表面的实际情况, [Q] The “Code for the Construction and Acceptance of Concrete Structures” stipulates that no stamping or installation of formwork and brackets shall be allowed on poured concrete before its strength has reached 1.2 MPa. In order to meet this requirement and ensure the quality of the concrete works, how should the strength of the concrete reach 1.2 MPa during construction? Please give guidance. (Guangxi Beihai Chen Tianyu) [Answer] The regulation of concrete strength of 1.2 MPa is based on the experience of the former Soviet Union and is not an absolute value. Mainly look at the actual situation of the concrete surface,