Abstract
As concrete is a building material that is widely used in the field of infrastructure construction, and its quality is related to the quality and service life in infrastructure engineering, concrete strength is an important reference index that reflects the concrete quality. Based on this, two commercial concretes A and B are selected in Henan Province, China, to perform the concrete strength test under same condition curing and standard condition curing in the pull-out post-insert method, cubic compression, rebound method, and drilling core method. The relationships between the different curing conditions, cubic compressive strength, core sample strength, rebound strength, and pull-out force of different commercial concretes are compared and analyzed. Through a comparative analysis and while considering the convenience and accuracy requirements, the strength curves of the two different concretes based on the pull-out post-insert method were fitted and analyzed, and the local strength curve test in Henan based on the pull-out post-insert method was established. The research results provide technical support for evaluating the strength of concrete structures using the pull-out post-insert method, which has important engineering significance for improving the popularize and application of the pull-out post-insert method.
Highlights
Concrete is one of the most widely used materials in highway engineering, bridge engineering, and construction engineering owing to the advantages of its convenient material selection, low price, and durability
In the semi-breakage detection method, samples are directly obtained from the structure for a strength test without affecting the overall performance of the structure, or a local damage test is directly performed at the appropriate parts of the structure, and the concrete strength value is calculated based on the test results
The results show that all kinds of parameters are in a reasonable range, so the pull-out method is applicable to the conclusion of testing the strength of ultra-high-strength concrete
Summary
Concrete is one of the most widely used materials in highway engineering, bridge engineering, and construction engineering owing to the advantages of its convenient material selection, low price, and durability. In the pull-out post-insert method, the concrete is hardened, the surface is drilled, the groove is cut, and the anchor is buried; the anchor is pulled out, and the strength of the concrete is estimated according to the pulling force. The fast curing adhesive anchoring is a test method for extracting the anchor after the hardening of the adhesive and estimating the strength of the structural concrete according to the pulling force. Two representative brands of commercial concrete in Henan are considered as the research objects, and the regional strength curve is establishes for the concrete after performing the loading and unloading method used in Henan This test mainly includes the pull-out post-insert pullout test, cubic compressive strength test, core drilling method, and rebound method. Pull-out test piece: the concrete test piece size is 500 mm 3 300 mm 3 250 mm, and each test minimum pull-out forces and the middle pull-out force is less than 15% of the intermediate pull-out force, the average of the three calculated values should be considered
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