Testing method for water permeability resistance of concrete core sample

Abstract

The invention discloses a testing method for water permeability resistance of a concrete core sample. The testing method comprises the steps as follows: 1) performing core drilling for sampling on a to-be-tested concrete structural solid; 2) machining the cylindrical concrete core sample with the height of 150 mm; 3) placing the cylindrical concrete core sample into an oven, then standing and cooling the concrete core sample to a room temperature; 4) painting high-permeability modified epoxy waterproof paint on the cylindrical side surface of the cylindrical concrete core sample, and standing the concrete core sample for 40-48 h; and 5) sealing the cylindrical concrete core sample into a press plate type anti-permeability instrument, enabling a water end surface to be downward, and performing water permeability resistance tests and data processing on the cylindrical concrete core sample. Compared with the prior art, the technical scheme can avoid test failures caused by leakage due to the fact that sealing or grouting materials cannot be firmly combined with core samples in the prior art and is more suitable for the water permeability resistance tests for concrete structure field core sample drilling. The testing method has the advantages of convenience in operation, small workload, low labor intensity, reliability in sealing effect and short test cycle.

Description

technical field [0001] The invention relates to a test method for water penetration resistance of a concrete core sample drilled from a solid concrete structure, and belongs to the technical field of concrete quality detection. Background technique [0002] During the construction or after the completion of the concrete structure, it may be necessary to evaluate the water penetration resistance of the concrete for various reasons, but there is no test method for the water penetration resistance of the solid concrete structure in the existing national standards and industry standards. Many jobs cannot be carried out. [0003] The Chinese invention patent publication with the application number 200710202500.3 and titled "Method for Drilling Core Sampling to Detect the Impermeability of Solid Concrete Structures" discloses a test method for the water penetration resistance of concrete core samples. The core sample is processed into a cylinder with a height of 150mm, placed in ...

AI Technical Summary

Problems solved by technology

[0003] The Chinese invention patent publication with the application number 200710202500.3 and titled "Method for Drilling Core Sampling to Detect the Impermeability of Solid Concrete Structures" discloses a test method for the water penetration resistance of concrete core samples. The core sample is processed into a cylinder with a height of 150mm, placed in the concrete impermeability forming test mold, and the grouting material is injected into the gap between the test mold and the concrete core sample to form, and after demoulding standard curing, it is tested according to the water permeability performance of ordinary concrete This method is cumbersome and needs to use grouting materials for secondary molding and maintenance, which makes the test period long; after curing, the test pieces are tested according to the method of ordinary concrete water penetration resistance, and the success rate of sealed molding is relatively low. Low, some may need to be re-sealed; the surface of the concrete core-like cylinder is smooth, and the bond strength with the grout is low, and water may seep from the joint between the grout and concrete, resulting in test failure