Cement-based material axial pressure creep testing device capable of regulating and controlling temperature, humidity and load

A technology for cement-based materials and testing devices, which can be used in measuring devices, using stable tension/pressure to test material strength, analyzing materials, etc., and can solve problems such as difficulty in achieving accuracy and convenience, and difficulty in maintaining constant stress.

Pending Publication Date: 2021-08-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these devices either use hydraulic jacks that are difficult to maintain a constant stress and springs with high rigidity to provi

Method used

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  • Cement-based material axial pressure creep testing device capable of regulating and controlling temperature, humidity and load
  • Cement-based material axial pressure creep testing device capable of regulating and controlling temperature, humidity and load
  • Cement-based material axial pressure creep testing device capable of regulating and controlling temperature, humidity and load

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specific Embodiment 1

[0030] Below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further detail:

[0031] The water-cement ratio is 0.3, and the hardened cement paste sample with a specification of 20*20*60mm is subjected to an axial pressure creep test for a duration of 30 days after standard curing for 28 days. First fix two LVDTs on the opposite side of the sample and connect the data collector. Set the creep stress to 10MPa. According to the conversion relationship between creep stress and Newton's force, the required pulling force is 4000N, and the pulling force is evenly distributed to load-bearing lever one (5) and load-bearing lever two (9) through the steel strand (11) and the force-bearing coil (8). , which are respectively 2000N, converted into a mass of 204kg. The upper and lower ends of the load-bearing pillar one (10) are respectively connected with the upper connection hole (6) and the lower connection hole (37) in the middl...

specific Embodiment 2

[0034]The water-cement ratio is 0.5, and the hardened cement paste sample with a specification of 30*30*100mm is subjected to an axial pressure creep test for a duration of 30 days after standard curing for 28 days. First fix two LVDTs on the opposite side of the sample and connect the data collector. Set the creep stress to 10MPa. According to the conversion relationship between creep stress and Newton's force, the required pulling force is 9000N, and the pulling force is evenly distributed to load-bearing lever one (5) and load-bearing lever two (9) through the steel strand (11) and the force-bearing coil (8). , which are 4500N respectively, converted into a mass of 460kg. Connect the upper and lower ends of the load-bearing pillar one (10) to the innermost upper connection hole (6) and the lower connection hole (37) respectively. The upper and lower ends of the load-bearing pillar two (13) are respectively connected with the innermost upper connecting hole (6) and the low...

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Abstract

The invention discloses a cement-based material axial pressure creep testing device capable of regulating and controlling temperature, humidity and load. The cement-based material axial pressure creep testing device comprises: an integral testing framework, wherein the integral testing framework consists of a fixed steel frame, a bearing support column, a bearing lever, a protecting device, a stabilizing device, bolts and the like; an axial pressure load regulation and control system composed of a slidable connecting device, a dead load counterweight device and a force transmission device; a test condition control system consisting of a temperature regulation and control device and a humidity regulation and control device; and a creep data acquisition and recording system consisting of a cement-based material sample, an axial pressure deformation measuring device and a data transmission and acquisition device. According to the invention, after a test piece and a deformation testing device are installed, the position of a bearing support column is adjusted, a counterweightblock matched with creep stress needed for testing is placed on a bearing tray, the needed temperature and humidity are set, and finally the temperature and humidity change is checked regularly and the creep degree progress is recorded; and the whole axial pressure creep testing device and method are simple and easy to implement, and the deformation characteristics of the cement-based material under various temperature and humidity and different creep stresses can be obtained.

Description

technical field [0001] The invention relates to the field of durability performance testing of cement-based materials, in particular to axial pressure creep testing technology, in particular to a cement-based material axial pressure creep testing device and testing method capable of regulating temperature, humidity and load. Background technique [0002] The axial creep of cement-based materials refers to the phenomenon that the strain of cement-based materials increases continuously under the action of continuous compressive stress. As an important factor affecting the durability and safety performance of materials and engineering structures, axial creep is significantly affected by ambient temperature, humidity and loading stress. Therefore, it is of great significance to be able to accurately determine the influence of temperature, humidity and stress level changes on the axial creep properties of cement-based materials. [0003] At present, the axial creep test of cemen...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01N3/04
CPCG01N3/12G01N3/04G01N2203/0676G01N2203/0682G01N2203/0019G01N2203/0202
Inventor 李悦刘运泽金彩云
Owner BEIJING UNIV OF TECH
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