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Concrete creep testing system

A test system and concrete technology, which is applied in the direction of testing the ductility of materials, etc., can solve the problems of inapplicability of full-graded concrete compression and creep tests

Inactive Publication Date: 2011-11-09
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing test device is only suitable for small specimens, not suitable for fully graded concrete compression creep test

Method used

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Embodiment Construction

[0013] The technical solution in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0014] figure 1 Shown is a schematic structural view of the concrete creep test system of the present invention, the test system includes a machine base 1, a screw 2, a lower platen 3, an upper platen 4, a top plate 5, an electro-hydraulic servo actuator 6, and a specimen carrying device , Test piece bottom plate 9, strain gauge 11, pressure ball seat 12 and pressure ball head 13, load sensor 14 and disc spring 15.

[0015] The bottom of the lead screw 2 is fixed on the machine base 1, the top plate 5 is fixed on the top of the lead screw 2, the lower pressure plate 3 and the upper pressure plate 4 can move on the lead screw 2, for example, an adjustment nut 16 is arranged under the upper pressure plate 4, and the adjustment nut 16 can be rotated 16 can adjust the height of upper pressing plate 4 on the...

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Abstract

The invention provides a concrete creep testing system, which comprises a base, a lead screw, a top plate, an electro-hydraulic servo actuator, a strain gauge, a load sensor and a disc spring, wherein the bottom of the lead screw is fixed on the base; the top plate is fixed at the top of the lead screw; a movable lower pressure plate and a movable upper pressure plate are arranged on the lead screw; the disc spring is arranged between the upper pressure plate and the top plate; the load sensor is arranged at the bottom of the upper pressure plate; the strain gauge is embedded into a test piece; and the electro-hydraulic servo actuator is arranged between the base and the lower pressure plate. According to the embodiment, counterforce loading is realized by adopting the disc spring at the upper part of the test piece, and the electro-hydraulic servo actuator for loading is adopted at the bottom of the test piece, so that the creep property of the full-grade concrete can be directly measured, the creep property of the full-grade concrete is reflected truly, and the engineering design is safer and more reliable, economic and reasonable.

Description

technical field [0001] The invention relates to a concrete creep test system. Background technique [0002] Concrete creep is the phenomenon that the deformation of concrete structures increases with time under continuous load. Creep often changes the stress of concrete buildings, structures or long-span bridges, causes large deformation of the structure, cracks the concrete structure, and even eventually fails. Therefore, it is particularly important to conduct creep tests on concrete. [0003] The existing test method is to wet-screen fully graded concrete to remove particles with an aggregate particle size greater than 40mm, and then form a small cylindrical specimen of φ150mm×450mm or φ200mm×600mm, and the test results are calculated to represent the whole grade. The creep characteristics of mass concrete, but after the concrete is wet screened, the content of coarse aggregate is reduced from about 70% to about 30%, the content of mortar is richer, and the material com...

Claims

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Application Information

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IPC IPC(8): G01N3/28
Inventor 肖汉江杨华全王述银李家正王迎春肖开涛戴春芳董芸严建军彭尚仕林育强周世华石妍张亮苏杰罗平黄安义
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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