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Method and application of simultaneous determination of concrete fracture toughness and tensile strength

A fracture toughness and tensile strength technology, applied in the field of civil and hydraulic engineering material performance testing, can solve the problems of high cost, long time, and a large number of repetitions, and achieve the effect of low cost, short time, and small test workload.

Active Publication Date: 2021-02-09
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for simultaneously measuring the fracture toughness and tensile strength of concrete and another solution for its application, so as to solve the existing simultaneous measurement of the fracture toughness and tensile strength of concrete without size effect The method needs to repeat a large number of experiments, and the fitting analysis of these experimental data results in high cost and time-consuming technical problems

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  • Method and application of simultaneous determination of concrete fracture toughness and tensile strength
  • Method and application of simultaneous determination of concrete fracture toughness and tensile strength
  • Method and application of simultaneous determination of concrete fracture toughness and tensile strength

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Embodiment 1

[0041] Embodiment 1: a kind of two-point straight line method that determines concrete fracture toughness and tensile strength by two-point loading test piece, comprises the following steps:

[0042] (1) According to the given concrete mix ratio requirements, pour a group of concrete two-point loading specimens with dimensions of W×B×S and joint height ratio α. Among them, W is the height of the specimen, B is the thickness of the specimen, S is the effective span of the specimen, the maximum particle size of concrete aggregate is dmax, and the initial crack depth of the specimen is a 0 , W, B, S, a 0 The units of dmax and dmax are millimeters; the seam height ratio α=a 0 / W; In the present embodiment, the mold is used to obtain the test piece by pouring concrete at one time. The mold is provided with a cuboid inner cavity, the height of the cuboid is equal to W, the length of the cuboid is greater than S, and the width of the cuboid is equal to B; In the inner cavity, in the...

experiment example 1

[0066] Experimental example 1: The maximum particle size of the concrete aggregate used in this experimental example 1 test d max = 13mm, T = 200mm. According to the size of the test piece, it is divided into three groups:

[0067] The first group W×B×S=200×150×800mm, seam height ratio α=a 0 / W=0.3, a total of 6 test pieces. Using the method of the present invention, based on the peak loads of 6 test pieces, the fracture toughness and tensile strength determined by 6 test pieces can be obtained respectively, and the fracture toughness obtained by the average value of the peak load of the first group of test pieces can be obtained. The average value of degree and tensile strength, the results are shown in Table 1.

[0068] The second group W×B×S=200×150×800mm, seam height ratio α=a 0 / W=0.4, 4 test pieces in total. Adopt the method of the present invention, based on the peak load of 4 test pieces, can respectively draw the fracture toughness and the tensile strength that 4...

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Abstract

A method for simultaneously measuring the fracture toughness and tensile strength of concrete and its application, comprising: making a concrete two-point loading test piece, performing a two-point loading test according to the static loading test method, to obtain the peak load P of the test piece, The beneficial effects of the fracture toughness and tensile strength of concrete are: the required test equipment is common, and the test workload is small, the test process is relatively simple, the cost is low, and the time consumption is short.

Description

technical field [0001] The invention relates to the technical field of performance detection of civil and hydraulic engineering materials, in particular to a method and application for simultaneously measuring fracture toughness and tensile strength of concrete. Background technique [0002] At present, to determine the tensile strength of concrete, test methods such as axial tension and split tension are often used. For the concrete fracture test, a three-point bending beam type with single-point loading in the middle of the span and supported at both ends is often used at present. The method of two-point loading is less used. Using two-point loading, a long pure bending section can be formed between the two loading points during the loading process of the specimen. The internal force formed by the internal and external forces at this distance is constant, and the force of the entire specimen is more stable. The test results more reliable. On the contrary, for single-poi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0017G01N2203/0067
Inventor 姚贤华管俊峰陈珊珊王娟曲福来李长明黄坡甘书凯袁鹏刘泽鹏徐文晓
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER