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Ternary strength measurement curve of concrete

A technology for measuring strength curves and concrete, which is applied in the direction of measuring devices, strength characteristics, and hardness of test materials, and can solve problems such as the detection of concrete compressive strength values

Pending Publication Date: 2021-03-02
湖南昌衡工程质量检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the long-term practice of engineering quality testing, this binary strength curve has caused great controversy for the test results of abnormally carbonized concrete compressive strength. Many senior experts and scholars in China believe that: at present, this kind of one-dimensional The method can no longer be directly used to detect the compressive strength of abnormally carbonized concrete

Method used

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  • Ternary strength measurement curve of concrete
  • Ternary strength measurement curve of concrete
  • Ternary strength measurement curve of concrete

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0011] Specific implementation methods (taking the ternary strength measurement curve of abnormally carbonized concrete as an example)

[0012] Step 1. Collect or specially make the rebound value R of the test block with the same condition as the component concrete m , carbonization depth value d m , Ultrasonic speed value V i , Generally, it should not be less than 10 groups, and the data under these standard conditions should be recorded in detail and archived.

[0013] Step 2. Analyze and arrange the standard data in step 1, and establish the ternary normal equation of the number, solve the number with the elimination method, and establish f=a'Rm+b'd m +C'V i +D' initial trial (mathematical) model.

[0014] Step 3. Analyze the error of the initial mathematical model, and establish the ternary strength measurement curve equation with practical value, namely f=aRm+bd m +CV i +D.

[0015] When the average relative error of the mathematical model of the initial ternary c...

example 1

[0044] Example 1: The shear wall of a construction site pulls concrete, and the rebound value R is measured by the rebound method m =36.5, carbonization depth detection value d m = 5mm Look up the table to estimate the concrete strength f = 30.5,

[0045] The wave velocity detected by ultrasonic wave is V=4.25, then the ternary curve calculation presumes the concrete strength f=32.1

[0046] The compressive value of the cotrophic test block left on site is 34.5MPa,

[0047] The abnormal carbonation of the concrete in this example is caused by dehydration during the watering and curing period, and the internal quality of the concrete is uniform and dense.

example 2

[0048] Example 2: Rebound value R of a concrete column at a construction site m =34.2, carbonization depth value d m =5.5mm, look up the table to estimate the concrete strength f=26.2MPa,

[0049] Ultrasonic detection wave speed V i = 4.58, the ternary curve calculation deduces the concrete strength f = 29.997MPa,

[0050] The compressive value of the co-cultured specimens left on site is 31.2MPa,

[0051]The abnormal carbonation of the concrete in this case is due to the decrease in alkalinity caused by the secondary hydration reaction of the mixed admixture during the watering and curing period, and the internal structure of the concrete is relatively dense.

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Abstract

The invention belongs to the field of construction engineering quality detection, and relates to a nondestructive detection technology for engineering structures and component concrete quality (including concrete compressive strength, concrete surface hardening, carbonization degree and concrete internal ultrasonic speed). A ternary strength measurement curve is constructed by using common qualityparameters of concrete and is used for rapid, scientific and accurate nondestructive testing of on-site structure and component concrete, and the actual compressive strength and the durable working capacity of the concrete are presumed.

Description

[0001] 1. Patent field: [0002] In the practice of construction engineering, the concrete compressive strength value of the main structure should be tested. The purpose is to determine whether the concrete material strength of the main structure meets the design requirements and whether it meets the requirements for safe use. An important technical indicator for acceptance, the "ternary strength curve of concrete" is a detection method for the concrete compressive strength value of the main structure. Therefore, this detection method invented is suitable for the detection of concrete compressive strength and internal quality of concrete in the field of construction engineering, and is a technical method for providing concrete quality information for project completion acceptance. [0003] 2. Technical Background [0004] At present, domestic testing methods for concrete compressive strength values ​​and internal quality conditions are traditionally classified into three catego...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/52G01N29/07G01N29/44G01N33/38
CPCG01N3/52G01N29/07G01N29/4418G01N33/383G01N2203/0218G01N2203/0236G01N2291/0232
Inventor 不公告发明人
Owner 湖南昌衡工程质量检测有限公司