Apparatus and method for testing cement concrete penetration performance under loading action

A technology for hydraulic concrete and testing device, applied in measurement device, permeability/surface area analysis, suspension and porous material analysis, etc.

Inactive Publication Date: 2007-11-21
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a hydraulic concrete permeability test device under load, aiming at the problems that the conventional test device cannot load the test piece and that the hydraulic pressure testing machine cannot guarantee the continuous stability of the load. Not only can the test piece be loaded, but the load added to the test piece is no longer provided by the commonly used hydraulic press for a long time. The new loading device can ensure the long-term continuous stability of the load and avoid the interference of the unstable load on the experimental results.

Method used

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  • Apparatus and method for testing cement concrete penetration performance under loading action
  • Apparatus and method for testing cement concrete penetration performance under loading action
  • Apparatus and method for testing cement concrete penetration performance under loading action

Examples

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Embodiment 1

[0020] Embodiment 1 Permeability test device of hydraulic concrete under load

[0021] The test device consists of two parts: a pressurizing device and a specimen chamber (17), wherein the steel chassis (1), steel plate (3) and steel plate (4) in the pressurizing device are respectively 340mm long, 170mm wide and 28mm high , four symmetrical round holes with a diameter of 18mm are respectively drilled around it, and four steel columns (2) with a diameter of 25mm at the lower end of 650mm in length and 16mm in diameter and threaded on the upper end are inserted into the steel columns (2). In the four circular holes on the chassis (1), the specimen chamber (17) is placed on the steel chassis (1), which is placed on the steel chassis by a plexiglass sleeve (7) with a diameter of 130 mm, a height of 120 mm, and a thickness of 8 mm. (1), put the concrete test piece (12) with inner and outer diameters of 30mm and 110mm and a height of 110mm into the sleeve (7), and there is a piece ...

Embodiment 2

[0022] Example 2 Test method for load permeability coefficient of hydraulic concrete.

[0023] 1. Raw materials and test pieces

[0024]Use P O32.5 grade cement (see Table 1 for physical properties), II grade fly ash, river sand with a fineness modulus of 2.5, limestone artificial gravel with a maximum particle size of 10mm and tap water according to the mix ratio shown in Table 2 Concrete was prepared and formed into cylindrical specimens with inner and outer diameters of 30mm and 110mm respectively, with 6 specimens in each group. After the specimen was cured in the concrete standard curing room for 28 days, the two ends of the specimen were cut off with a diamond saw blade to obtain a specimen with a height of 110 mm. Three specimens in each group were selected to measure the compressive strength, which was used as a reference for the loading size of the remaining specimens in the impermeability test. The compressive strength of each group of specimens is shown in Table 2...

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Abstract

A device used for testing permeation performance of hydraulic engineering concrete under load action is prepared forming pressurizing unit by steel chassis, steel plate, steel vertical column, spring, nut and bolt; forming test-piece chamber by sleeve, up-pressing steel plate, down-pressing steel plate, ball base and concrete test-piece. Its testing method is also disclosed.

Description

1. Technical field [0001] The invention relates to a test device for measuring the permeability of hydraulic concrete, in particular to a test device and a test method for the permeability of hydraulic concrete under continuous and stable load. 2. Background technology [0002] Some durability problems of hydraulic concrete, including: chloride ion erosion, water penetration and dissolution, alkali aggregate reaction, carbonation and steel corrosion, freeze-thaw cycle damage, etc. are closely related to permeability. Good impermeability is a necessary condition to ensure the safety and durability of many important projects. Over the years, people have studied the permeability of hydraulic concrete and the durability problems caused by the penetration of gas-liquid media, but most of them revolve around a single influencing factor. However, hydraulic concrete in engineering practice does not work under a single factor, and generally bears the joint action of two or more fact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N13/04
Inventor 顾冲时方永浩吴中如郑东健包腾飞苏怀智王建
Owner HOHAI UNIV
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