Device and method for testing evaporation rate of water passing through concrete surface under wick effect

A technology of concrete surface and evaporation rate, applied to measuring devices, weighing by removing certain components, analyzing materials, etc., can solve problems such as inconsistency in the transmission of salty moisture, avoid volatility and hysteresis, and increase test effect of space

Pending Publication Date: 2021-07-16
JIANGSU SOBUTE NEW MATERIALS
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  • Abstract
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Problems solved by technology

The devices involved in these two patents can only test the evaporation rate of brine passing through the concrete test block vertically, which is inconsistent with the actual transmission of saline moisture in the project

Method used

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  • Device and method for testing evaporation rate of water passing through concrete surface under wick effect
  • Device and method for testing evaporation rate of water passing through concrete surface under wick effect
  • Device and method for testing evaporation rate of water passing through concrete surface under wick effect

Examples

Experimental program
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Effect test

Embodiment

[0067] Table 1 Mixing ratio for water evaporation test

[0068]

[0069]As shown in Table 1, four types of concrete were designed, and the two water-binder ratios of 0.55 and 0.45 were compared, whether mineral admixtures (25% fly ash FA and 15% mineral powder SL) were added, and mineral powder was added at the same time. The effect of admixtures and erosive medium inhibitors or preservatives (TIA, RMA produced by Jiangsu Subote New Materials Co., Ltd.) on the water evaporation rate. Form a concrete test block of 175mm×185mm×150mm, and after curing for 28 days, obtain a core sample with a diameter of 75±2mm by drilling a core, dry it in an oven at 105°C for 72±2h, take it out and dry it in a drying oven for at least 24h.

[0070] Use the specific implementation method to do the described test device, test with reference to the above steps, control the ambient humidity to 40%, do not consider the influence of wind speed, and keep the external temperature at 25°C, lift the pl...

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Abstract

The invention discloses a device and a method for testing an evaporation rate of water passing through a concrete surface under a wick effect. The device is composed of a closed testing environment box, an environment parameter control system, a quality testing system, a data transmission system and a data processing system. According to the device, the lower part of a test block is soaked in an erosion solution of a sample container, and the upper part of the test block is exposed in an environment with specific temperature, humidity and wind speed; the erosion solution can only be transmitted in the to-be-tested concrete test block under the action of the wick, and is finally evaporated into a sealed environment through the surface of the upper part of the concrete; and the evaporation rate of water passing through the concrete surface is calculated through utilizing the mass change of the testing device. According to the device, the field service environment can be simulated before construction, and water evaporation rate values of different mix proportions can be tested, so that the optimal mix proportion of the salt-resistant crystal concrete can be screened; meanwhile, a core sample of the existing concrete structure can be obtained through core drilling and is used for evaluating the salt crystallization corrosion resistance of the existing concrete structure.

Description

technical field [0001] The invention relates to the technical field of salt crystallization resistance evaluation in concrete durability research, in particular to a device and method for testing the water evaporation rate of concrete surface under wick effect. Background technique [0002] The total area of ​​saline soil in my country is about 36 million hectares, accounting for 4.88% of the country's usable land area, of which 70% is inland saline soil; various sulfates are usually dissolved in soil and groundwater in saline soil areas, such as Xinjiang The sulfate concentration in groundwater in the Korla area is as high as 21,299 mg / L, and the sulfate concentration in the drainage ditch of the Baijialing Tunnel on the Chengdu-Kunming Railway has reached 32,475 mg / L, making concrete structures in these environments face serious risks of sulfate erosion damage. [0003] Salt crystallization damage is the fastest and most serious form of damage to concrete by sulfate attack:...

Claims

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Application Information

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IPC IPC(8): G01N5/04G01N17/00
CPCG01N5/04G01N17/00
Inventor 谢德擎穆松刘建忠刘凯马麒周莹刘光严郭政
Owner JIANGSU SOBUTE NEW MATERIALS
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