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Apparatus and method for testing expansion coefficient of cement concrete for pavement

A technology of cement concrete and testing equipment, which is applied in the direction of material thermal expansion coefficient, etc., and can solve complex problems

Inactive Publication Date: 2015-10-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the complexity of ordinary equipment for testing the thermal expansion coefficient of concrete, it is recommended to use 1× 10-5 / ℃, ignoring the difference in thermal expansion coefficient of concrete caused by different aggregates

Method used

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  • Apparatus and method for testing expansion coefficient of cement concrete for pavement
  • Apparatus and method for testing expansion coefficient of cement concrete for pavement
  • Apparatus and method for testing expansion coefficient of cement concrete for pavement

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] like Figure 1-Figure 3 Shown, a kind of pavement cement concrete expansion coefficient testing device comprises:

[0044] A water tank that can place the test bracket and the cement concrete specimen 5; the water tank is filled with water with a temperature range of 10°C to 50°C, and the water surface can be more than 20mm higher than the test bracket. A temperature detector that is embedded in the cement concrete specimen 5 and can test the temperature within the surface of the cement concrete specimen 5 and the temperature of the water in the tank; it is fixed on the upper end of the test bracket and connected to the upper end surface of the cement concrete specimen 5 to be tested. A dynamic displacement sensor 1; a data acquisition instrument 8 connected to the temperature sensor and the linear differential displacement sensor 1 respectively...

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Abstract

The invention discloses a testing device for the expansion coefficient of cement concrete for the road surface. The testing device comprises a water trough, a temperature detector, a linear differential displacement sensor and a data acquisition instrument, wherein the water trough can be used for placing a testing bracket and a cement concrete test piece; the temperature detector is buried in the cement concrete test piece and can be used for testing the temperature in the surface of the cement concrete test piece and the water temperature in the water trough; the linear differential displacement sensor is fixedly arranged at the upper end of the testing bracket and is connected with the upper end face of the cement concrete test piece to be tested; the data acquisition instrument is connected with the temperature sensor and the linear differential displacement sensor respectively. The invention further discloses a testing method using the testing device. According to the testing device and the testing method, the thermal expansion coefficient of a prepared test piece and a road surface field coring test piece can be determined rapidly so as to provide calculation and analysis evidences to road surface designing, performance judgment and service life predication.

Description

technical field [0001] The invention relates to a device and a method for testing the expansion coefficient of cement concrete for pavement. Background technique [0002] Cement concrete aggregate is the main component material of road pavement, and its expansion performance varies with the composition of rock minerals. For each rock, the range of thermal expansion depends on chemical composition, structure and porosity. Research at home and abroad shows that the thermal expansion coefficient of quartz is the highest among common minerals, which is 12×10-6 / ℃. The thermal expansion coefficient of rocks with high quartz content is similar to that of quartz; the coefficient of rocks without quartz (limestone, marble) is about 5×10-6 / ℃. [0003] Because aggregate is the main component of concrete, the performance of aggregate largely determines the performance of concrete. The expansion and contraction of concrete under the condition of rising and falling temperature is mainl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/16
Inventor 孙仁娟陈达豪姚占勇葛智周志东郝庚任孙尚渠王丽娜
Owner SHANDONG UNIV
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