What is the required temperature for the curing of concrete test blocks?

1) The required temperature is 20 2 and the humidity is 95%.

2) According to the "National Standards of the People's Republic of China.

GB T50081-2002 "Standard for Test Methods for Mechanical Properties of Ordinary Concrete", the new standard puts forward higher requirements for the temperature and humidity of the standard curing room in the original standard, from the original temperature of 20 3 and the humidity of more than 90% of the standard curing room to the standard curing room with the same temperature of 20 2 and humidity of more than 95% as the ISO test method.

Temperature 20 2 .

The curing of concrete test blocks is divided into standard curing and curing under the same conditions, and the curing temperature of the test block is also different: standard curing refers to the curing under standard conditions (temperature 20 2, relative humidity of more than 95% curing conditions); The maintenance of the test block under the same condition means that the test block is placed close to the corresponding structural component or part, and the same maintenance method (including temperature, etc.) is adopted.

"Concrete Structure Solid Strength Same-Condition Curing Test Block" (hereinafter referred to as "Same-Condition Curing Test Block") is a new provision proposed in the new "Code for Construction Quality Acceptance of Concrete Structure Engineering" (GB50204-2002) (the current specification is GB50204-2015).

Concrete curing under the same conditions refers to the concrete specimens placed at the concrete pouring site and cured under the same temperature and humidity conditions of the components;

The standard for the maintenance age is 28 days;

In terms of temperature recording, the standard stipulates that the test specimen under the same conditions should be tested after the daily average temperature accumulates 600 days.

For pouring concrete elements, in any case a standard curing test block should be made.

When it is necessary to know the actual strength of reinforced concrete at a certain time, it is necessary to do the same condition curing test block, such as tensioning, dismantling of support, winter construction and so on.

Summary. The standard curing conditions for concrete test blocks are: temperature 18 to 22 degrees, relative humidity 95%.

After the concrete is poured, it can gradually set and harden, mainly because of the result of cement hydration, and hydration requires appropriate temperature and humidity conditions, so in order to ensure that the concrete has suitable hardening conditions and its strength continues to grow, the concrete must be cured according to standards.

Under what conditions should the concrete test block be cured under standard conditions, and under what conditions should it be cured under the same conditions.

The standard curing conditions for concrete test blocks are: temperature 18 to 22 degrees, relative humidity 95%. After the concrete is poured, it can gradually set and harden, mainly because of the result of cement hydration, and hydration requires appropriate temperature and humidity conditions, so in order to ensure that the concrete has suitable hardening conditions and its strength continues to grow, the concrete must be cured according to standards.

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The Code for Acceptance of Construction Quality of Concrete Structure Engineering stipulates that the standard maintenance test block is in the range of temperature 20 2, humidity greater than 95%, and curing for 28 days.

The specification clearly stipulates that the test blocks used to check the concrete strength of structural components should be randomly selected at the pouring site of the concrete, and the sampling and retention of the test blocks should comply with the following regulations:

1) No more than 100 cubic meters of concrete with the same mix ratio, sampling shall not be less than once;

2) When the concrete of the same mix ratio is less than 100 trays mixed in each working shift, sampling shall not be less than once;

3) When a continuous pouring exceeds 1000 cubic meters, sampling is taken once every 200 cubic meters, and the concrete of each floor and the same mix ratio shall be sampled not less than once;

4) Each sampling should be at least one set of standard maintenance test orange sail blocks, and the number of retention groups of the same condition maintenance test blocks should be determined according to actual needs.

The concrete test block is divided into two kinds of test blocks under the same conditions and standard maintenance test blocks, and the test blocks under the same conditions are placed on the site, and the concrete you are constructing is dismantled at the same time to carry out the same maintenance; After the standard culture test block is made, it is covered with plastic film to retain water, cured in an environment of 20 5 degrees for 48 hours, and then dismantled and put into the curing room for standard maintenance (ambient temperature 20 2 degrees, relative humidity 95%).

1. Standard maintenance test block.

After the test block is removed and numbered, the test block is placed in the standard curing room (room temperature 20+

3. Relative humidity: 9

0% or less) to the test age.

Generally 28 days or according to design requirements).

The test blocks of the standard curing room should be placed on an iron frame or a wooden frame for curing, and the distance between them should be at least 3-5

cm。In addition, the test block of the steam-cured concrete structural component should be cured with the structural component, and then transferred to the standard condition for maintenance.

Second, the same condition test block.

The on-site construction should be maintained in the same environment as the maintenance conditions of the components as the test blocks for testing the strength of demoulding or hoisting.

After the mold is removed under the same conditions, it is placed at an appropriate position close to the corresponding structural component, and the same maintenance method is adopted as that of the component.