How to deal with the unqualified concrete impermeability test block?

First, the treatment method:

If the construction is completed, it can reduce the impact of groundwater by waterproofing the interior.

If you don't finish it, then adjust the impermeability level.

2. Sampling regulations for concrete impermeability test blocks:

1. The number of retention groups of impermeability specimens is one group per 500m3 of continuously poured concrete. Ready-mixed concrete is used.

It depends on the size and requirements of the structure.

2 But per unit of work.

There must be no less than two groups.

3. The specimen should be made at the pouring site.

4. The impermeability performance should be evaluated by the test results of cured concrete impermeability specimens under standard conditions.

3. Impermeable concrete.

A brief introduction:

Impermeable concrete is divided into P6, P8, P10 and P12 according to different impermeability pressures. Impermeable concrete improves the pore structure by increasing the compactness of concrete, thereby reducing the permeability channel and improving the impermeability. The commonly used method is to mix with air-entraining admixtures to produce inconnected bubbles inside the concrete, cut off the capillary channel, and change the pore structure, so as to improve the impermeability of the concrete.

In addition, the water-cement ratio is reduced.

The selection of appropriate varieties and strength grades of cement to ensure the quality of construction, especially to pay attention to vibration and compaction, sufficient curing, etc., all play an important role in improving impermeability.

The impermeability concrete test block should be cured in the standard curing room between 28 days and 60 days, and the test block does not need to be left in place after the test. Generally, 500 square meters of concrete is enough to make a group of test blocks.

Generally, 500 square meters of concrete are used as a group of test blocks, but the specification also requires that another condition be met at the same time, that is, each project shall not be less than 2 groups! That is to say, even if it is within 500 square meters, there must be at least 2 sets of test blocks. See Article 1 of GB50208-2002!

Concrete test blocks.

The method of handling the non-conformity is as follows:

1. The usual treatment method is to entrust the testing center to conduct drill sampling and solid rebound;

2. According to the relevant national specifications, introduce a third-party engineering quality inspection agency with legal qualifications to test the structural entity;

3. If the stamen and rebound are still unqualified, you can contact the design and Party A.

Discuss and carry out structural reinforcement treatment. If you do not agree with the reinforcement treatment, then you can only chisel out;

4. The unqualified concrete test block can only represent the unqualified concrete of a certain part, and the reason for the unqualified is not necessarily the problem of concrete mix ratio, but also the improper production and maintenance of the test block. If the test block is unqualified, it must be dealt with, because now the testing center and the quality supervision station.

It is connected to the network, and the results will be uploaded to the quality supervision station for publication as soon as possible;

5. For the unqualified engineering parts of the test block, the points should be randomly selected according to the requirements of the specification, and then the structural entity rebound detection should be carried out, and the strength of the entity should be judged to meet the requirements of the specification and drawing design according to the test results. If it is complied with, the concrete strength of the engineering site will be based on the rebound test report according to the specification and design requirements.

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6. After the solid rebound test, if the concrete strength can not meet the requirements of the specification and drawing design, the concrete component of the part should be tested by solid core-pulling, and the core-pulling structure meets the specifications and design requirements, and the concrete strength of the engineering part can be evaluated according to the core-pulling test report.

1. If the test block is unqualified, the structural entity inspection should be carried out.

2. Because the concrete test block can not completely replace the on-site structure, because there are many factors affecting the strength of the test block, such as production, maintenance, instruments and other factors will lead to the reduction of the strength of the test block, in order to ensure the concrete strength safety of the structural entity, the broken or non-damaged method is generally used for physical inspection.

1) The rebound core drilling method is used to inspect the structural entity, pass the inspection, and agree to accept it.

2) If it is unqualified, it is necessary for the original design unit to carry out design accounting, meet the design requirements, agree to acceptance, and if the requirements are not met, it should be reinforced, and the reinforced structural entity should be re-accepted.

3) If it cannot be reinforced or the reinforcement is still unqualified, it will not be accepted and should be reworked.

"Invalid concrete test block" means that the material does not meet the requirements of the concrete strength grade.

Concrete compressive strength test is an important means to evaluate the quality of structural concrete in highway engineering test and detection, and the uncertainty of the structural concrete strength test results is analyzed to improve the effectiveness and rationality of the test data, but considering the complexity of the influencing factors.

1. Evaluation basis: refer to GB T 50081 2002 "Standard for Test Methods for Mechanical Properties of Ordinary Concrete".

2. Measuring instrument: hydraulic universal testing machine.

3. Measured object: the compressive strength of the concrete test block with a design strength grade of C30 and a size of 100mm 100mm 100mm.

Treatment: If the construction is completed, it can be waterproofed by internal skin branches to reduce the impact of groundwater. If it is not done, then adjust the impermeability and other inspection levels.

Sampling regulations for concrete impermeability test blocks: 1. The number of retention groups of impermeability specimens is one group of continuous pouring concrete every 500m. When using ready-mixed concrete, it depends on the size and requirements of the structure.

2 However, there shall be no less than two groups per unit of works. 3. The specimen should be made at the pouring site. 4. The impermeability performance should be evaluated by the test results of the concrete impermeability specimen cured under standard conditions.