混凝土抗压强度与其早期热膨胀系数相关性试验研究

Experimental study on correlation between compressive strength and thermal expansion coefficient of concrete at early ages

混凝土早期热膨胀系数和抗压强度是早期开裂计算和结构计算重要的热、力学参数,但两者有相关性。文中试验研究了21组不同配合比混凝土的早期热变形和抗压强度,以粗骨料种类、粉煤灰掺量和外加剂为影响因素。研究表明:粗骨料热膨胀系数在5.5x10^6/℃左右时,抗压强度有最大值;单位抗压强度的热膨胀系数与粉煤灰掺量呈线性关系;掺外加剂时,抗压强度和热膨胀系数成反比关系。研究结果对建立相关工程概念有现实意义。

The thermal expansion coefficient（TEC） and compressive strength of concrete are important thermal and mechanical parameters in early cracking and structural calculation.The two are associated.In this paper, the early thermal deformation and compressive strength of 21 different mixes of concrete were experimental studied. The factors influencing such as coarse aggregate type, fly ash content and admixture were studied. The results show that the compressive strength is maximum when the TEC of coarse aggregate is 5.5 x10^6/℃, and the TEC of unit compressive strength is linear with the content of fly ash, and compressive strength is inversely proportional with the TEC when adding an admixture. The results of the study have practical significance in establishing the related engineering concept.