低热水泥全级配混凝土真实强度确定方法

真实的全级配混凝土强度参数是准确分析大坝结构工作性态的基础条件。本文提出了一种低热水泥全级配混凝土真实强度的确定方法。该方法首先采用成熟度法对现场浇筑、天然养护条件下大坝混凝土的强度试验结果展开分析，确定全级配和湿筛混凝土强度的换算关系；进而通过环境箱恒温养护条件下混凝土的强度试验获得湿筛混凝土强度的预测公式；最后结合已确定的强度换算关系，建立全级配混凝土真实强度的预测公式。该预测公式的验证与应用结果表明：预测公式可满足实际大坝工程使用需求，且可为大坝结构分析提供相较于传统方法更为真实的低热水泥全级配混凝土强度参数。

Method for determining real strength of full-graded low-heat cement concrete

Real strength parameters of full-graded aggregate concrete are a basic condition for accurate analysis on the working behaviors of a dam structure. This paper describes a method for determining the real strength of full-graded low-heat cement concrete. In this method, we examine the strength test results of natural-cured cast-in-site dam concrete by the maturity method, and determine a strength conversion relationship between full-graded concrete and wet-sieved concrete. Then, an equation is obtained for predicting the strength of wet-sieved concrete through strength tests of the concrete cured in the environmental chamber under constant temperatures. Finally, we establish a real strength prediction equation using the conversion relationship already determined. Verification and application results show that the prediction equation meets the practical engineering needs of dam construction, and that relative to traditional methods, it provides calculations closer to the real strength parameters of full-graded low-heat cement concrete.