Large-size concrete engineering constraint realizing method

A technology of mass concrete and realization methods, applied in the direction of measuring devices, instruments, scientific instruments, etc.

Active Publication Date: 2019-03-08
BEIHANG UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few methods for converting the constraint degree of mass concrete engineering into the constraint degree of temperature stress testing machine, especially the relati

Method used

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  • Large-size concrete engineering constraint realizing method
  • Large-size concrete engineering constraint realizing method
  • Large-size concrete engineering constraint realizing method

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Experimental program
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Embodiment

[0039] This test method has been tested on the concrete test block in the field, and the effectiveness and rationality of the method for realizing the constraint degree of mass concrete engineering have been verified. Figure 5 is the size of the concrete block, and points 1, 2, 3, and 4 are the test points of the block. The temperature history and deformation of the concrete are tested from the beginning of pouring, and the drawn time-temperature curve and time-displacement curve are input into the computer until the test Finish.

[0040] The temperature history curves and deformation curves of test points 1, 2, 3, and 4 are shown in Figure 6 and 7 , except that the temperature history and deformation curve are different, the constraint degree of each measuring point becomes smaller with the increase of height, and each measuring point can be regarded as the same concrete material poured at the same time.

[0041] The constraint degrees of test points 1, 2, 3, and 4 are ca...

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Abstract

The invention discloses a large-size concrete engineering constraint realizing method. The method mainly includes following steps: (1), calculating standard constraint degree: according to actual engineering concrete block size, combining with elastic modulus of newly-cast concrete and old concrete to calculate constraint degree at a corresponding position of large-size concrete; (2), calculatingengineering constraint degree: calculating the constraint degree at the corresponding position of the large-size concrete according to on-site measured relaxation modulus and free deformation; (3), combining with on-site construction to measure time-temperature curve and time-deformation curve of the large-size concrete; (4), inputting the measured time-temperature curve and the time-deformation curve into a computer system for experimenting; (5), according identical temperature process and deformation process, realizing conversion between engineering constraint degree and machine constraint degree of the large-size concrete, and evaluating crack resistance of the concrete according to measured parameters like stress and strain and cracking process to formulate more accurate standard constraint degree.

Description

technical field [0001] The invention relates to a simulation test device and method for the whole process of concrete displacement control, belonging to the technical field of water conservancy and hydropower engineering, and in particular to a temperature stress simulation test of mass concrete under different constraint degrees. Background technique [0002] After pouring concrete, due to the heat of hydration and the poor thermal conductivity of concrete, most of the heat generated cannot be dissipated, resulting in an increase in the temperature of the concrete and volume expansion. Generally speaking, the adiabatic temperature rise of concrete in water conservancy projects can reach 10-40°C. Even considering surface heat dissipation, the maximum temperature inside the concrete is still 7-35°C higher than that during pouring. When the block size is large, the internal temperature rise will be higher. During the process of temperature drop and contraction, the block will...

Claims

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Application Information

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IPC IPC(8): G01N33/38
CPCG01N33/383
Inventor 刘龙龙陈先明张国新刘毅王振红辛建达欧阳建树李飞龙黄达海
Owner BEIHANG UNIV
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