开封地区超声回弹综合测强专用曲线试验研究

采用开封地区常用混凝土原材料,针对非泵送和泵送两种混凝土,制作不同强度等级的混凝土试块,并按照规范方法在不同龄期完成综合法强度测试,然后进行抗压破损试验,并选用相应的数学模型来拟合综合法强度参数和实际抗压强度之间的关系。最后,随机采用在建工程留取的试块进行验证性试验,证明曲线的强度推定值与破损试验值有较好的拟合性。建立了适用于开封地区且精度高于全国通用测强曲线的超声回弹综合法专用曲线。

Research on Special Curve of Concrete Strength by Ultrasonic Rebound Combined Method in Kaifeng Region

Using the local raw mterials such as aggregate and sand in Kaifeng,dozens of specimens of concrete chosen from both the pumped and the non-pumped with different grades of strength and in different age groups were made and tested by ultrasonic-rebound combined method followed by load bearing capacity test until the specimens destroyed completely.The modeling was used to analyse the relation between the strength curve by ultrasonic-rebound combined method and the measured strength.The verification tests were also carried out,showing the suggested curve fitted the measured one quite well.The special curve of concrete strength suitable for Kaifeng region and more accurate than that recommended in the National Code has been worked out.