What to do if the mortar test block compression report is invalid 5

If the test block report is invalid, it can only be physically inspected, that is, on-site sampling for relevant tests, if it meets the design requirements, it should be OK. (Another way is to supervise and build the unit.)

Issue a certificate and re-submit it for inspection, for reasons you are free to play).

Acceptance and evaluation of the strength of masonry mortar test block.

1. When the strength of the masonry mortar test block is accepted, the strength qualification standard must meet the following requirements:

The compressive strength of the mortar test block in the same acceptance batch.

The average value must be greater than or equal to the cube corresponding to the design strength class.

Compressive strength; The minimum set of average values of the compressive strength of the same batch of mortar test blocks must be greater than or equal to the times of the cube compressive strength corresponding to the design strength grade.

Note: 1 For the acceptance batch of masonry mortar, there should be no less than 3 groups of mortar test blocks of the same type and strength grade. When there is only one set of test blocks in the same acceptance batch, the average value of the compressive strength of the group of test blocks must be greater than or equal to the cube compressive strength corresponding to the design strength level.

2. The strength of the mortar should be subject to the compressive test results of the test block with standard curing and an age of 28d.

2. When the following situations occur during construction or acceptance, the on-site inspection method can be used to detect or sample the strength of mortar and masonry, and determine its strength:

1) The mortar test block is not representative or the number of test blocks is insufficient;

2) There is doubt or controversy about the test results of the mortar test block;

3) The test results of the mortar test block cannot meet the design requirements.

The compressive resistance of the cubic specimen 1 mortar cube with the side length size as is.

Summary. 1. If the concrete of the same mix ratio is less than 100 trays or no more than 100m3 of concrete with the same mix ratio mixed in each working shift, sampling shall not be less than once; When a continuous pouring exceeds 1000m3, the concrete with the same mix ratio shall be sampled less than once every 200m3; For each floor, the concrete poured at the same time in a row and with the same mix ratio shall be sampled not less than once; For every 50m3 poured cast-in-place pile, 1 group of specimens must be retained, and for piles with a single column and single pile less than 50m3, 1 group of specimens must be retained for each pile. The mixture used in each group of specimens should be sampled from the same tray of concrete or the same car of concrete, and multiple groups of specimens should not be sampled from the same tray of concrete or the same car of concrete, and the sampling should be taken between 1 4 and 3 4 of the amount of discharge during the unloading process.

2. The concrete mixture should be divided.

The bending resistance of the slurry test block is unqualified.

Hello! I'm glad to answer for you, I hope it can help you. 1. If the concrete of the same mix ratio is less than 100 trays or no more than 100m3 of concrete with the same mix ratio mixed in each working shift, sampling shall not be less than once; When more than 1000m3 is poured at one time, the concrete sampling of the same mix ratio shall not be less than once every 200m3; For each floor, the concrete poured at the same time in a row and with the same mix ratio shall be sampled not less than once; For every 50m3 poured cast-in-place pile, 1 group of specimens must be retained, and for piles with a single column and single pile less than 50m3, 1 group of specimens must be retained for each pile.

The mixture used for each group of specimens should be sampled from the same tray of concrete or the same car of concrete, and multiple groups of specimens should not be sampled from the same tray of concrete or the same car of concrete, and the sampling should be taken between 1 4 and 3 4 of the amount of discharge during the unloading process. 2. The concrete mixture should be divided.

The concrete mixture should be loaded into the mold in two layers, the charging thickness of each layer is roughly equal, and the smashing should be carried out evenly from the edge to the center according to the spiral direction; When inserting the bottom layer of concrete, the tamper should reach the bottom of the trial mold, and when inserting the upper layer, the tamper should penetrate the upper layer and insert the lower layer 20-30mm; When inserting, the tamper should be kept vertical, and the smiling slope should not be tilted; The number of insertions in each layer is not less than 12 times in the cross-sectional area of 100cm2, and then the spatula should be inserted and pulled several times along the inner wall of the test mold, and the rubber hammer should be used to gently tap the test mold around until the cavities and bubbles disappear. 3. After the standard maintenance specimen is disassembled, it is immediately put into the standard box (room) with a temperature of 20 2 and a relative humidity of more than 95% for maintenance, and the specimen is classified neatly, and the distance between the specimens is maintained at least 3 Establish the operation record of the curing box (room) and the registration record of the specimen in and out of the curing box (room). 5. The maintenance specimens under the same conditions should be placed in the steel cage required by the company, placed in an appropriate position close to the corresponding structural components or structural parts, and the same maintenance method as the entity should be adopted.

6. The specimen must be clearly marked with macro information such as the name of the project, the position of the axis, the strength grade, and the retention time, and the identification should be engraved on the surface of the specimen, and the detection age of the standard maintenance test block is.

If the grouting test block fails to pass the dismantling resistance, you can follow the steps below:

1.First of all, re-check the preparation process of the test block to ensure that the test block is made in accordance with the standard process and requirements.

2.Check whether the storage conditions of the test block are affected by external factors, such as temperature and humidity.

3.Check whether the test results of the test block are accurate, such as whether the test data is read correctly, etc.

4.If all three of the above are correct, then you can try to re-prepare the test block and then test the defects again to make sure that the newly prepared test block meets the requirements.

5.If, after several re-preparations, the block still does not meet the requirements, you may want to consider re-evaluating the design and preparation process of the block to identify possible problems and make improvements.

The ultimate goal is to ensure that the dismantling strength of the test block meets the design requirements to ensure the actual engineering quality.

The treatment method of the anti-dismantling failure of the grouting test block is as follows: only the rock lead should be retested. If the retest result is still unqualified, the human factors in the preparation of the specimen should be ruled out, and whether there are problems in the preparation, maintenance and test operation of the specimen, for example, should be pointed out.

If these factors are excluded, the problem of the material itself should be considered, such as the selection of raw materials and the proportion of mixture. If a problem with the material itself is found, it is necessary to re-select the material and prepare a new specimen for testing. In short, for the situation that the grouting test block is unqualified in terms of dismantling resistance, it is necessary to carefully analyze the cause and take corresponding measures to solve the problem.

It doesn't matter if the demoulding test block is unqualified, it just means that the concrete strength does not meet the requirements of the demoulde. As for the standard maintenance, the same conditions are timely in the concrete part represented by the unqualified concrete test block. If not, find a way to say that when the line is scattered, I am afraid that the concrete strength is not enough or what, and I will do several more sets of tape or something every time.

The specification stipulates that when the difference between the maximum value and the minimum value of the single strength of the same group of concrete test blocks exceeds 15% of the intermediate value, this group of test blocks is evaluated as invalid. If there are multiple sets of test blocks left in the same department, they can be re-sent under the supervision of supervision. When the main body is accepted, the representative parts of the unqualified test block must be rebounded or core-pulled.

What mortar yours? Mortar evaluation: Generally qualified, but when a single mortar test block exceeds 2 grades, it is generally regarded as an invalid test block, and the supervision unit can negotiate to resend it, issue a rework certificate, or call the quality inspection station on-site rebound.

There may be several situations in which the evaluation is invalid, 1: the strength of the specimen is not enough. 2：

The compressive strength of the specimen fluctuates too much, such as M5 mortar specimen 1: specimen 2: specimen 3:

After the assessment is unqualified, it seems that it is not possible to send it again, because the test piece is manufactured synchronously with the building, which has to depend on the supervision. 3: It may be that the appearance of the specimen is not enough

You're using a microcomputer compression testing machine.

When two data of the compressive strength of this group of test blocks are outside the error range, this group of tests is invalid.

The reason for the ineffectiveness may be that there is a problem with the testing machine, the cement is not completely homogenized before molding, the molding process is wrong, the temperature and humidity of the curing environment are uneven, and the stone may be shaken out of small cracks during demoulding.

Invalid data reason:

1. There is a problem with the testing machine.

2. The cement is not homogenized completely before molding.

3. There is an error in the molding process.

4. The temperature and humidity of the maintenance environment are uneven.

5. When demolding, the stone may be shaken out of small cracks.

It is due to the fact that the strength of concrete is too discrete and the strength is uneven.

Method steps.

Look at the progress of the project.

This depends on your progress, if it has not been fully completed, you can immediately send and shed test block, of course, the premise is that your floor has not started, once the construction has started, and then send it will not work, because the sample of the test block is required.

What should I do if the test block is missed?

Contact the testing unit.

Because you need to send a sample to the testing unit, call ** to consult, see if your test block can be tested now, if you can, regret the shed chain then send it immediately, don't delay the business.

What should I do if the test block is missed?

Report to the manager in a timely manner.

If you make this kind of mistake, you should not underestimate it, if you really have a problem with the quality of your project, because you missed the test block and there is a problem, you can not afford this responsibility, so be sure to report to the manager in time. You can't afford to delay this.

What should I do if the test block is missed?

Look at the situation of the testing unit.

In some places, in order to make money, even if you miss it, you can do it, of course, state-owned enterprises are not good, so if you test in a private testing unit, then you might as well use your personal relationship, but it's best not to do it.

What should I do if the test block is missed?

You can wait for the next floor to be completed.

If you're working on the next layer, you might as well wait for the next layer to be completed, because there's nothing you can do if you're working on the next layer. All you need to do is consider the factors.

What should I do if the test block is missed?

Complement body detection.

If your test block is not sent, then in order to verify that there is no problem if the test block is not sent, then you must carry out the main body test, only if you pass the main body test and prove that your place is qualified, then it doesn't matter if there is no report.

What should I do if the test block is missed?

Wait for the report. After the test block is re-sent, you must wait for the report, because only with the report, will it be recognized by the supervision department, so waiting for the report is a must, don't lose it.

What should I do if the test block is missed?

1) The average compressive strength of the mortar test block of the same acceptance batch must be greater than or equal to the cubic compressive strength corresponding to the design strength grade; The minimum set of average values of the compressive strength of the same batch of mortar test blocks must be greater than or equal to the times of the cube compressive strength corresponding to the design strength grade.

2) For the acceptance batch of masonry mortar, the mortar test block of the same type of strength grade should not be less than 3 groups; When there is only one set of test blocks in the same acceptance batch, the average value of the compressive strength of the group of test blocks must be greater than or equal to the cube compressive strength corresponding to the design strength level.

3) The strength of the mortar should be subject to the compressive test results of the test block with a standard curing age of 28d.

4) Sampling quantity: each inspection batch and no more than 250 cubic meters of masonry of various types and strength grades of masonry, each mixer should be sampled at least once.