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 ex

Method used

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  • Concrete strength rapid determination method
  • Concrete strength rapid determination method
  • Concrete strength rapid determination method

Examples

Experimental program
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Effect test

Example Embodiment

[0047] 1. Implementation plan

[0048] Adopt the concrete mix ratio actually used in construction, and adopt the same material as the concrete on site.

[0049] 2. Specimen production

[0050] (1) Making concrete specimens → pre-embedded temperature test components at the center of the concrete specimens → after the specimens are formed and plastered, the specimens shall be kept quietly at 20±5℃ for 1 / 2 hour → put the specimens in a standard curing box for 24 hours → Demould and put it into the accelerated curing box → Within 3 / 4 hours, the concrete core temperature will be raised to 80℃ → Adjust the water temperature and control the concrete core temperature of 80℃ through the temperature test element, keep it for 16 hours → Take out the test piece at 20±5 Cool indoors at ℃ for 3 / 4 hours → do a compression test, and the accelerated curing strength R16h is measured;

[0051] (2) Each concrete sample should be formed into two groups of test pieces to form a pair: accelerated curing te...

Example Embodiment

[0061] Example 1

[0062] In this example, the strength of concrete specimens with a water-binder ratio of 0.36~0.58 and a slump of 120±30mm was quickly measured and deduced. The specific mix ratio of the concrete specimens to the group is as follows figure 1 Shown. Concrete strength R measured in each test 28d And corresponding concrete rapid hardening strength R 16h And the established strength presumptions are as figure 2 with image 3 Shown. Specific, such as Picture 10 As shown, the power function type estimated strength in this embodiment: R 28d "=23.952R 16h 0.2344 , R 2 = 0.8367, S = 2.524, C V =5.75%.

Example Embodiment

[0063] Example 2

[0064] In this example, the strength of concrete specimens with a water-to-binder ratio of 0.35~0.51 and a slump of 180±30mm was quickly measured and deduced. The specific mix ratio of the concrete specimens to the group is as follows: figure 1 Shown. Concrete strength R measured in each test 28d And corresponding concrete rapid hardening strength R 16h And the established strength presumptions are as Figure 4 with Figure 5 Shown. Specifically, the power function type estimated strength in this embodiment: 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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