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Device and method for measuring moisture diffusion coefficient of cement-based material

A technology of cement-based materials and diffusion coefficients, which is applied in the direction of measuring devices, suspension and porous material analysis, and analytical materials. Short, mature equipment, the effect of reducing time

Pending Publication Date: 2022-04-12
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the literature (Solution of Moisture Diffusion Coefficient of Early-age Concrete Based on Internal Humidity Test, Journal of Tsinghua University (Natural Science Edition), 2008, 48(12): 2033-2035.) proposes that the measuring device has many operating steps, and the measuring time is long, so it cannot Determination of water diffusivity at a specific age
Literature (Analysis of Temperature and Humidity Response Parameters Inside Concrete: Moisture Diffusion Coefficient and Thermal Conductivity, Materials Herald, 2021, 35(12), 12075-12080) proposes a measurement device with many steps, which makes the cement-based material internally saturated for too long. And there is no guarantee that the inside of the cement-based material will be completely saturated with water
[0004] Due to the limitations of existing measurement methods, the moisture diffusion coefficient of cement-based materials is generally based on empirical values ​​in actual scientific research and engineering calculations, which is difficult to meet actual needs. Therefore, it is urgent to develop a method that can quickly, easily and accurately measure the moisture content of cement-based materials. Measuring device and method of diffusivity

Method used

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  • Device and method for measuring moisture diffusion coefficient of cement-based material
  • Device and method for measuring moisture diffusion coefficient of cement-based material
  • Device and method for measuring moisture diffusion coefficient of cement-based material

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Experimental program
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Embodiment 1

[0046] Embodiment 1: as Figure 1-7 As shown, a device for measuring moisture diffusion coefficient of cement-based materials, including: 1. mold; 2. embedded pipe; 3. temperature and humidity sensor; 4. portable data analyzer; 5. mold base; 6. embedded pipe clamp ;7, inserting plate; 8, bottom surface of mold; 9, side of mold; 10, side of mold; 11, side of mold; 12, side of mold; 13, mold handle; 14, sealant between temperature and humidity sensor and embedded pipe Sealing treatment; 15. Anti-seepage slurry material for embedded pipes; 16. Gap reserved at the end of embedded pipes; 17. Sealing treatment for non-dry surfaces of concrete specimens; 18. The gap between the temperature and humidity sensor and the embedded pipe Sealing ring; 19, computer; 20, card slot; 21, the reserved bolt hole on the side (12); 22, the reserved semicircular hole on the side (12); 23, the circular hole in the center of the mold bottom surface; 24, the plug Reserved bolt holes on the plate (7); ...

Embodiment 2

[0067] Embodiment 2: a kind of measuring method of cement-based material moisture diffusion coefficient measuring device, adopt described measuring device, select C30 concrete for use, concrete mix ratio is as follows:

[0068] Cement: water: sand: stone: fly ash = 240:186:750:1150:60

[0069] Include the following steps:

[0070] S1. The height of the sides of the mold (9), (10), and (11) is 50 mm. Place the three embedded pipes (2) on the mold base (5). The embedded depths of the three embedded pipes (2) are respectively 20mm, 60mm, 100mm, the pre-embedded pipe (2) is fixed by the pre-embedded pipe clamp (6), and the gap (16) at the end of the pre-embedded pipe is 2mm wide;

[0071] S2. After fixing the 3 pre-embedded pipes (2), insert the inserting plate (7) into the base (5), and connect with the side (12) with 2 screws to further fix the pre-embedded pipe (2) and the inserting plate ( 7);

[0072] S3, block the round hole (23) on the bottom surface (8) with a film or p...

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Abstract

The invention discloses a cement-based material moisture diffusion coefficient determination device and a determination method, and relates to the field of cement-based material physical property parameter determination. The measuring device comprises a mold used for fixing an embedded pipe and pouring a cement-based material test piece; the embedded pipe is used for placing a temperature and humidity sensor; the temperature and humidity sensor is used for collecting humidity data; and the portable data analyzer is used for analyzing the humidity data and displaying a result and can be connected with the computer. The device can effectively measure the moisture diffusion coefficient of the cement-based material, is simple and portable, is convenient and easy to operate, can quickly analyze and display a result, solves the problem that the moisture diffusion coefficient is difficult to quickly measure, and provides actually measured physical property parameters for durability analysis of the cement-based material. The device is suitable for testing the moisture diffusion coefficient of the cement-based material under the same conditions in laboratory scientific research tests and engineering sites, and can be popularized and applied as a standard device and a standard method.

Description

technical field [0001] The invention relates to the technical field of cement-based materials, and relates to a water diffusion coefficient measuring device and a measuring method. Background technique [0002] Generally, the ambient humidity is lower than the internal humidity of the cement-based material. Due to the difference between the internal humidity of the cement-based material and the ambient humidity, the moisture inside the cement-based material will continue to diffuse into the environment, so that the relative humidity inside the cement-based material will continue to decrease. The reduction of internal relative humidity will cause shrinkage and cracking of cement-based materials, which will greatly reduce the safety and life of cement-based materials. The moisture diffusion coefficient is an important parameter for calculating the relative humidity inside the cement base material. Therefore, it is necessary to accurately and quickly determine the moisture diff...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N13/04G01N33/38
Inventor 丁小平郝挺宇王晟曾滨韩宇栋
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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