混凝土极限拉伸值问题思考

Thoughts on Ultimate Tension Value of Concrete

通过比较标准试件与原级配试件极限拉伸值试验结果 ,比较标准试验结果与缓慢拉伸试验结果以及原型观测结果 ,比较极限拉伸变形与干缩变形以及试验误差分析 ,指出将极限拉伸值作为抗裂的设计指标与温控的矛盾 ,特别是对高掺粉煤灰大体积混凝土 ,片面强调混凝土极限拉伸值 。

By comparision of the ultimate tension test results for the standard samples with the original gradation ones, the standard test results with the test results of creep tension and prototype observations, deformation arising from ultimate tension with deformation from dry shrinkage, and analyses on test errors, it has been pointed Out that a design index of cracking resistance only based on the ultimate tension will go against the temperature control. Especially, for the massive concrete with high dosage of fly ash, if the ultimate tensions are put undue emphases on, it will be not favorable for the unti-cracking of concrete.