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Concrete strength rapid determination method

A technology for rapid determination of concrete strength, applied in the direction of measuring devices, preparation of test samples, instruments, etc., can solve problems such as poor prediction accuracy, and achieve the goals of improved accuracy, small average relative error, good correlation and accuracy Effect

Pending Publication Date: 2020-07-14
CHINA MCC17 GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of relatively poor prediction accuracy when using the existing rapid curing method to perform curing treatment on concrete, thereby providing a rapid concrete strength determination method

Method used

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Experimental program
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Effect test

Embodiment approach

[0048] The concrete mix ratio actually used in the construction is adopted, and the same materials as the concrete on site are used.

[0049] 2. Test piece production

[0050] (1) Make concrete specimens → pre-embed the temperature test element in the center of the concrete specimens → rest the specimens in a room at 20±5°C for 1 / 2 hour after forming and plastering the specimens → put the specimens in a standard curing box for 24 hours → Remove the mold and put it into the accelerated curing box → Increase the temperature of the concrete center to 80°C within 3 / 4 hours → Adjust the water temperature and control the temperature of the concrete center to 80°C through the temperature test element, keep it for 16 hours → Take out the test piece at 20±5 ℃ Indoor cooling for 3 / 4 hours → do a compression test, and measure the accelerated curing strength R16h;

[0051] (2) Each concrete sample should be molded into two groups of specimens to form a pair: accelerated curing specimens ...

Embodiment 1

[0062] In this embodiment, the strength of concrete specimens with a water-binder ratio of 0.36 to 0.58 and a slump of 120 ± 30mm is quickly measured and estimated, and the mix ratio of concrete specimen pairs is specifically as follows figure 1 shown. The concrete strength R measured in each test 28d and the corresponding rapid hardening strength of concrete R 16h And the established strength estimation formulas are as follows figure 2 and image 3 shown. Specifically, such as Figure 10 As shown, in this embodiment, the power function type presumes the strength: R 28d "=23.952R 16h 0.2344 , R 2 =0.8367, S=2.524, C V = 5.75%.

Embodiment 2

[0064] In this embodiment, the strength of concrete specimens with a water-binder ratio of 0.35 to 0.51 and a slump of 180±30mm is quickly measured and estimated, and the mix ratio of concrete specimen pairs is as follows: figure 1 shown. The concrete strength R measured in each test 28d and the corresponding rapid hardening strength of concrete R 16h And the established strength estimation formulas are as follows Figure 4 and Figure 5 shown. Specifically, in this embodiment, the power function type infers the strength: R 28d "=24.228R 16h 0.2393 , R 2 =0.8646, S=2.662, C V = 5.92%.

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Abstract

The invention discloses a concrete strength rapid determination method, which belongs to a concrete strength detection method. A temperature testing element is pre-buried in the center of a standard test piece to control the center temperature of concrete to be 80 DEG C, concrete curing is accelerated and kept for 16 hours, the concrete is cooled to the room temperature, the compressive strength R16h of the concrete is measured, and meanwhile the standard curing test piece is manufactured to measure the 28-day compressive strength R28d of the concrete; and regression is carried out by using amathematical statistics least square method principle to establish an intensity relational expression: a power function expression R28d = aR16h. Results can be measured in a short time, the concrete quality can be judged according to the results, and the method is good in reliability, high in precision and easy to operate and has more practical guiding significance in accelerating the project progress and guaranteeing the project quality.

Description

technical field [0001] The invention belongs to the technical field of concrete strength detection, and more specifically relates to a method for quickly measuring concrete strength. Background technique [0002] my country is the country with the largest construction scale in the world today. With the continuous progress of our society, the construction scale is getting larger and larger. In these construction projects, concrete structures occupy an important position, and the requirements for engineering quality are increasing day by day. At present, the evaluation method for the quality of concrete mixture is: reserve a certain number of concrete test blocks when pouring concrete, after a certain period of standard curing, and then complete the relevant mechanical properties and durability tests. Due to the long period of this test method, in the production process, on the one hand, the shortcomings in the production cannot be discovered in time, so that active and effect...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N33/38
CPCG01N1/28G01N33/383
Inventor 何兆芳尹万云金仁才张峥
Owner CHINA MCC17 GRP
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