Abstrakt: |
Compressive strength and elastic modulus are important mechanical indexes of young concrete. The rapid and accurate detection of the mechanical indexes of young concrete has an important guiding role in the management of concrete demoulding time and the improvement of concrete construction quality. According to research, most of the surface defects of concrete are due to the failure to grasp the timing of mold removal, which leads to defects in the concrete at the early aging time and long-term existence in the later operation process, which not only affects the appearance of the structure, but also affects the structural safety of the concrete in serious cases. In order to reduce the concrete defects caused by demoulding, it is necessary to study the strength testing technology of the early aging time. Based on the research on the detection technology of the elastic modulus of the spherical impact method, this paper proposes the young concrete strength detection technology of the tunnel based on the spherical impact method and establishes the compressive strength and spherical impact based on the static load test through the indoor model test. Through indoor model test research, the linear correlation between the compressive strength based on static load test and the elastic modulus of spherical impact method is established, and the correlation coefficient R reaches 0.99. Then through design experiments and test analysis, it is found that the raw material composition, mix ratio changes and other factors have little effect on the test results of the spherical impact method. Finally, the technology was applied to the site inspection of tunnel engineering. The results show that the technology can be used to detect the early concrete strength of tunnel lining, and it can meet the application requirements of the project, which has important guiding significance for optimizing the time of mold removal during tunnel lining construction. [ABSTRACT FROM AUTHOR] |