A test method for Poisson's ratio of concrete
A test method and technology for concrete specimens, applied in the direction of applying stable tension/pressure to test material strength, measuring devices, instruments, etc., can solve the loss of transverse deformation strain gauges, poor repeatability of transverse deformation of concrete Poisson's ratio, influence Concrete lateral deformation and other problems, to achieve the effect of convenient testing, good repeatability and accurate test data
Active Publication Date: 2018-01-02
SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD
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Problems solved by technology
[0003] There are some defects in the existing Poisson's ratio test technology: the conventional Poisson's ratio test method needs to use lateral deformation strain gauges, and there is a defect that the lateral deformation strain gauges need to be lost for each detection of Poisson's ratio; The quality is different, and the repeatability of the lateral deformation of the concrete Poisson's ratio is poor; because the lateral deformation strain gauges of the conventional Poisson's ratio test technology are installed at the two top end compression positions, the lateral deformation of the concrete specimen is affected by the strain gauge The friction between the two end faces of the top and bottom of the concrete affects the lateral deformation of the concrete
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Embodiment 1
[0027] Present embodiment is a kind of concrete test method of Poisson's ratio of concrete, and this test method specifically includes following detailed steps:
[0028] The first step is to select the concrete to be measured for Poisson's ratio, and make the concrete into multiple specimens with a specification size of 300mm×100mm×100mm, use these fabricated concrete specimens as test specimens, and place them on the concrete specimens Mark the strength grade and number of the concrete, and the standard maintenance to the design age. Different strength grades have different Poisson's ratios. The numbering is to distinguish different test blocks; there are differences in the Poisson's ratio of concrete of different ages. Hence the need to show age.
[0029] The second step is to crush the concrete specimens to be determined for Poisson's ratio, specifically, use a press to crush 3 pieces at a speed of 0.5~1.0MPa / s to obtain the axial compressive strength of the three concrete ...
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The invention relates to a method of testing Poisson's ratio of concrete. The method includes: performing testing by pressurizing in static elastic modulus test, selecting a concrete specimen of specified size, selecting a specified test area on the concrete specimen and a test scheme, placing transverse strain gauges at the centers of two opposing sides of the concrete specimen, placing longitudinal strain gauges at positions, determined distances away from the upper and lower end faces, on two longitudinal sides of the concrete specimen, precisely measuring and recording transverse deformation and longitudinal deformation, and calculating the Poisson's ratio of the concrete through the transverse deformation, the longitudinal transformation and a conversion coefficient. The method has the advantages that measuring is precise and fast, testing cost is lowered and repeatability is good.
Description
technical field [0001] The invention relates to building material concrete, in particular to a test method for detecting Poisson's ratio of concrete. Background technique [0002] Poisson's ratio was first discovered and proposed by French scientist Poisson (Simon Denis Poisson, 1781-1840). It is an elastic constant reflecting the lateral deformation of materials. The ratio of transverse strain to longitudinal strain is called Poisson's ratio µ, also known as the coefficient of transverse variability. The Poisson's ratio of concrete refers to the proportional relationship between the transverse tensile strain and the longitudinal compressive strain of concrete when it is compressed. There is no clear regulation on the Poisson's ratio in the concrete structure design code, and the data obtained for the Poisson's ratio of different grades of concrete are mostly between 0.20 and 0.27. If the concrete surface at the lower part of the pipe pile is under tension at the same time...
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IPC IPC(8): G01N3/08G01N3/02
Inventor陈建大吴德龙田颖钱卞成辉
OwnerSHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD