Semi-conductive heat-conducting block for frozen soil subgrade, preparation method and laying method thereof

A technology for building blocks and roadbeds, applied in the field of semi-conductive blocks for frozen soil roadbeds and their preparation, can solve problems such as high consumption and increase in materials, achieve uniform heating, reduce thermal expansion and cold contraction, and improve stability.

Active Publication Date: 2022-05-17
NANYANG NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

②, ③, ④ need to consume a lot of materials and greatly increase the amount of construction

Method used

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  • Semi-conductive heat-conducting block for frozen soil subgrade, preparation method and laying method thereof
  • Semi-conductive heat-conducting block for frozen soil subgrade, preparation method and laying method thereof
  • Semi-conductive heat-conducting block for frozen soil subgrade, preparation method and laying method thereof

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Experimental program
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Effect test

preparation example Construction

[0039] A method for preparing a semi-thermally conductive block for a frozen soil subgrade, comprising the following preparation steps:

[0040] Step 1, utilizing block raw materials including cement, sand, silica fume, water and concrete foaming agent to prepare foamed concrete blocks;

[0041] Step 2. Place the cured test block in a closed space equipped with a pipeline for injecting metering liquid, heat it to 80~85°C and pump air to a pressure below 3kPa, and the pressure does not increase significantly after 10 seconds after stopping the pumping , that is, under the condition of not pumping air but keeping warm at 80~85°C, add 95% ethanol through a meterable pipeline, so that the volume ratio of absolute ethanol to free water in the test block is not less than 4, and continue to keep warm for more than 24 hours. Take out the ethanol after it is evenly distributed inside the block.

[0042] Further, after taking out the block to which ethanol was added in step 2, thermall...

specific Embodiment

[0053] A method for preparing a semi-thermally conductive block for a frozen soil subgrade, specifically comprising the following preparation steps:

[0054] Step 1. Take water and methylvinyldiethoxysilane (internal waterproofing agent, referred to as "silane") to mix and stir. After stirring evenly, add cement, fine sand, silica fume, and stir well to obtain slurry. Cement: fine The mass ratio of sand: silica fume: silane is (30~40): (50~65): (4~6): (0.3~0.7);

[0055] Step 2. Add the foam produced by diluting and foaming the foaming agent into the slurry obtained in step 1. After stirring evenly, pour it into the mold and scrape it flat;

[0056] Step 3. After demoulding, get the test block, place the test block in the curing box, and cure it at 25°C for 28~40 days. ≤4%;

[0057] Step 4. According to the "Construction Industry Standards of the People's Republic of China (JG / T-266-2011)", take 6 pieces and measure the "dry density, water absorption and compressive strength...

Embodiment 1

[0062] The formula of embodiment 1 block is as shown in table 1. During the production of blocks, the ingredients are produced according to the weight percentage. The test block takes 16L raw materials according to the weight, and makes 15 test blocks of 10×10×10cm. The 1L material is used as a room for adjustment and container contamination loss.

[0063] Table 1 Example 1 Frozen Soil Subgrade Block Formula 1 (total volume of materials used: 16L)

[0064]

[0065] Test block preparation and laying

[0066] 1. Take a stainless steel cylinder with a diameter of 36.8cm and a depth of 37cm, make a ruler and draw a mark 20cm away from its A end, hold the B end so that AB coincides with the busbar on the inner wall of the cylinder. When aligned, the volume from the plane shown at end A to the bottom of the barrel is the target volume of foam concrete foam slurry, and its volume is 16 L.

[0067] 2. Add 3652.5g of tap water and 70.3g of silane to the stainless steel drum descri...

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Abstract

The invention provides a semi-heat-conducting block for frozen soil subgrade and its preparation method and laying method. Cells formed by foaming and capillaries distributed around the cells are distributed inside the block. Cells and capillaries contain ethanol and The working medium formed by the mixing system of a small amount of free water, its preparation method includes the following preparation steps: Step 1, using block raw materials including cement, sand, silica fume, water and concrete foaming agent to prepare foamed concrete blocks ; Step 2, under the condition of 80~85 ℃, put the block in the closed space to draw a stable negative pressure, then add ethanol, continue to keep warm and take it out; It is greatly improved, and it is not afraid of water immersion and erosion, which can ensure that the service life of the road and the traffic safety are greatly improved simultaneously.

Description

technical field [0001] The invention belongs to the technical field of traffic and foam concrete, and in particular relates to a semi-heat-conducting block for a subgrade of frozen soil, a preparation method and a laying method thereof. Background technique [0002] Foamed concrete has excellent properties such as low density, thermal insulation and sound insulation, non-flammability, long service life, low environmental pollution, and easy recycling and reuse. Therefore, its application fields are becoming wider and wider, and its usage is also increasing. At present, it has been widely used in road and railway subgrade engineering in non-severely cold areas of the plain. Because the cast-in-place construction of foam concrete has relatively strict requirements on temperature, and the water absorption rate of conventional foam concrete products is too high, and the freeze-thaw resistance is poor, so the application in high-altitude and high-cold regions such as the Qinghai-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B38/10C04B41/83E01C3/00E01C3/02E01C3/04E01C3/06E02D17/20
CPCC04B28/00C04B38/106C04B41/83C04B41/478E01C3/00E01C3/02E01C3/04E01C3/06E02D17/20C04B2201/50C04B2201/20C04B2201/32C04B22/002C04B24/42C04B14/06C04B18/146C04B2103/42C04B24/02C04B38/0067Y02A30/60
Inventor 王利亚李森兰吕文朴李波
Owner NANYANG NORMAL UNIV
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