A method for determining the structural stress of cement concrete pavement slabs at early age
A technology for cement concrete roads and structural stress, which is applied to measuring devices, instruments, scientific instruments, etc., and can solve problems such as unreliable measured strain
Active Publication Date: 2021-03-23
SHANXI PROVINCIAL RES INST OF COMM +1
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Problems solved by technology
[0005] In order to solve the unreliable measured strain problem in the existing cement concrete pavement early-age stress measurement technology in the background technology, the accuracy of the measured strain is improved from the two aspects of determining the initial time of strain collection and extracting the elastic strain, and then a new method is proposed. Determination method of early-age structural stress of cement concrete pavement
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[0065] The invention provides a method for measuring the early-age structural stress of cement concrete road slabs. The method for measuring the early-age structural stress of cement concrete road slabs comprises the following steps:
[0066] 1) Estimating the initial moment of strain acquisition of cement concrete pavement slab, the specific implementation method is:
[0067] 1.1) Calculate the change over time of the temperature representative value (which can represent the temperature of the entire concrete specimen) of the scaled concrete specimen after forming under constant temperature and humidity conditions:
[0068] 1.1.1) Use the same raw materials and mix ratio as the cement concrete slab to be tested to carry out the scale test, and measure the temperature change with time at different layers of the scaled concrete specimen under constant temperature and humidity conditions;
[0069] 1.1.2) On the basis of the temperature of the different layers of the scaled concr...
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Abstract
The invention belongs to the technical field of a cement concrete pavement of a highway and an urban road, and relates to a measuring method for the structure stress of the cement concrete pavement atearly-age. The method comprises the following steps of: 1) estimating a strain acquisition initial moment of the cement concrete pavement; 2) taking the strain acquisition initial moment of the cement concrete pavement determined in the step 1) as a starting point to calculate the elastic strain of the cement concrete pavement; and 3) calculating the structure stress of the cement concrete pavement at the early-age within a measuring period according to the elastic strain of the cement concrete pavement calculated in the step 2). According to the measuring method, the accuracy of actually measured strain is improved from the two aspects of determining the strain acquisition initial moment and extracting the elastic strain, and the measuring method for the structure stress of the cement concrete pavement at the early-age is then provided.
Description
technical field [0001] The invention belongs to the technical field of cement concrete pavement of highways and urban roads, and relates to a method for measuring the early-age structural stress of cement concrete pavement slabs, in particular to a method for measuring the early-age structural stress of cement concrete pavement slabs for highways and urban roads test methods. Background technique [0002] In the highway engineering monitoring and early warning technology, the calculation of the structural stress σ of the cement concrete pavement mainly depends on the accurate measurement of the strain ξ and the modulus E. With the improvement of the early modulus measurement technology, the reliability of the measured strain becomes the key to the correct calculation of the stress. decisive factor. [0003] Cement concrete is a multi-phase, multi-component composite material. With the change of cement hydration, water loss, temperature and load conditions, the material grad...
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IPC IPC(8): G01N11/00
CPCG01N11/00G01N2011/0093
Inventor 张艳聪高玲玲刘少文张翛王帅边伟董立山贾蓉蓉王国忠
Owner SHANXI PROVINCIAL RES INST OF COMM