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Temperature control anti-cracking method for hot cement concrete in lining structure

A cement concrete, temperature control anti-cracking technology, applied in the direction of instruments, calculations, electrical digital data processing, etc., can solve the problems of inability to control temperature control and anti-cracking, no calculation method, etc., to achieve temperature control anti-cracking, good effect, scientific strong effect

Active Publication Date: 2019-11-15
WUCHANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the above facts, the age at which the maximum temperature inside the thermal concrete in the lining structure occurs is an important indicator related to the temperature control and anti-crack performance of the lining structure, but there is still no correlation Correspondingly, it is impossible to carry out effective temperature control and crack prevention according to this index.

Method used

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  • Temperature control anti-cracking method for hot cement concrete in lining structure
  • Temperature control anti-cracking method for hot cement concrete in lining structure
  • Temperature control anti-cracking method for hot cement concrete in lining structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The 1.0m thick (F2 type) lining structure of the Xiluodu flood discharge tunnel is medium hot cement concrete

[0036] Taking the 1.0m thick (F2 type) lining as an example, the finite element method is used for simulation calculation. The calculation conditions are: start pouring on July 1, the pouring temperature is 27°C, no water cooling temperature control measures are taken, and the side wall adopts C 90 40 normal concrete, the top arch adopts C 25 For pumping concrete, only the side walls and the top arch are studied, and the base plate pouring is not considered. The formwork is removed after 3 days of pouring. The interval between side wall and top arch pouring is 31 days, and the length of the joint is 9m.

[0037] The maximum temperature, the maximum internal surface temperature difference and the occurrence time of the typical parts of the 1.0m thick (F2 type) lined concrete side wall are shown in Table 1 below, and the temperature duration curve is shown in ...

Embodiment 2

[0055] The lining structure of the Xiluodu flood discharge tunnel is 0.8m and 1.5m thick with medium-heat cement concrete

[0056] In order to analyze the applicability of formula 1 for lining thickness and water cooling conditions, for image 3 For the section of the lining structure, keep the section size after lining unchanged and only change the thickness of the lining. First, use the finite element method to simulate and calculate, and then use formula 1 to calculate the maximum internal temperature occurrence age d tm Calculation.

[0057] Finite element simulation calculation, the calculation scheme in the case of water cooling is as follows: pouring starts on July 1 in summer, the bottom plate and side and roof arches are poured separately, and the pouring interval is 31 days; the pouring temperature is 18°C, the distance between water pipes is 1.0m, and the water Cool in water at 15°C for 15 days, remove the mold after 3 days, and sprinkle water on the surface for 2...

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Abstract

The invention provides a temperature control anti-cracking method for hot cement concrete in a lining structure. The temperature control anti-cracking method is characterized by comprising the following steps: step 1, collecting temperature control data of the hot cement concrete in the lining structure; 2, calculating the highest temperature generation age dtm in the hot cement concrete in the lining structure, wherein dtm = 0.19 * H + 0.0083 * C-0. 0322 * T0-0. 0047 * Tg + 2.9, and H is the thickness of the concrete, C is the concrete strength grade, t0 is the concrete pouring temperature, Tg is a water cooling equivalent water temperature value, Tg = 35-Tw, and Tw is a water cooling water temperature; and step 3, determining water cooling time dj based on dtm, and then further optimizing a lining moderate heat cement concrete temperature control anti-cracking measure scheme according to the water cooling time dj. Temperature control anti-cracking is conducted on the hot cement concrete in the lining structure through the method, the durability of the lining structure can be effectively improved, and the service life of the lining structure can be effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of concrete temperature control and anti-cracking, and in particular relates to a method for temperature-controlling and anti-cracking of hot cement concrete in a lining structure. Background technique [0002] Lining is a structure widely used in civil engineering. Lining concrete will heat up due to the heat of hydration of cement and other cementitious materials, resulting in high internal temperature. For example, the highest temperature inside the lining concrete of the water delivery tunnel in the permanent ship lock of the Three Gorges Water Conservancy Project reaches nearly 60°C, and the lining concrete of the water delivery tunnel of Xiaolangdi Hydropower Station The highest internal temperature reached more than 70°C. The thickness of the lining structure is small, and most of them have high strength (for example, the strength of the spillway tunnel of a large hydropower station reaches C50, C60)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 段亚辉段次祎
Owner WUCHANG UNIV OF TECH
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