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Method for pouring large dam by utilizing double-swelling cement

A dual-expansion, cement technology, applied in construction, infrastructure engineering and other directions, can solve the problems of slow dam speed and high construction cost, and achieve the effect of compensating for shrinkage, reducing construction cost and accelerating construction speed.

Inactive Publication Date: 2012-07-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional method is not only very slow to pour the dam, but also the construction cost is very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Double-expansion cement is used for dam construction, and SO in cement 3 The magnesium oxide content in the clinker is 3.0%, and the magnesium oxide content in the clinker is 4.0%. At the same time, the mineral composition and heat of hydration of the clinker meet the requirements of GB200-2003 medium-heat cement.

[0019] 2. The dam concrete is mixed with double expansion cement, aggregate, finely ground slag, ice chips, water reducing agent and air-entraining agent. The double expansion cement accounts for 1 / 7 of the weight of the concrete, and the ground slag is 40% of the double expansion cement. The concrete mixing water is replaced by ice chips, and the aggregate is precooled to reduce the concrete pouring temperature. Admixtures are water reducer, air entraining agent and so on.

[0020] 3. Pre-embed circulating cooling water pipes inside the cement concrete of the double expansion dam, and pass in cold water to reduce the temperature of the concrete.

[002...

Embodiment 2

[0024] 1. Double-expansion cement is used for dam construction, and SO in cement 3 The content of magnesium oxide in clinker is 2.8%, and the content of magnesium oxide in clinker is 5.5%. At the same time, other mineral composition and heat of hydration of clinker meet the requirements of GB200-2003 medium heat cement.

[0025] 2. The dam concrete is mixed with double expansion cement, aggregate, finely ground slag, ice chips, water reducing agent and air-entraining agent. The double expansion cement accounts for 1 / 10 of the weight of the concrete, and the ground slag is 40% of the double expansion cement. The concrete mixing water is replaced by ice chips, and the aggregate is pre-cooled to reduce the concrete pouring temperature. Admixtures are water reducer, air entraining agent and so on.

[0026] 3. Pre-embed circulating cooling water pipes inside the cement concrete of the double expansion dam, and pass in cold water to reduce the temperature of the concrete.

[0027]...

Embodiment 3

[0030] 1. Double-expansion cement is used for dam construction, and SO in cement 3 The content of magnesium oxide in clinker is 3.5%, and the content of magnesium oxide in clinker is 6.0%. At the same time, other mineral composition and heat of hydration of clinker meet the requirements of GB200-2003 medium heat cement.

[0031] 2. The dam concrete is mixed with double expansion cement, aggregate, fly ash, ice chips, water reducing agent and air-entraining agent. The double expansion cement accounts for 1 / 12 of the weight of the concrete, and the fly ash is 20% of the double expansion cement. The concrete mixing water is replaced by ice chips, and the aggregate is precooled to reduce the concrete pouring temperature. Admixtures are water reducer, air entraining agent and so on.

[0032] 3. Pre-embed circulating cooling water pipes inside the cement concrete of the double expansion dam, and pass in cold water to reduce the temperature of the concrete.

[0033] 4. Before the d...

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Abstract

The invention relates to a method for pouring a large dam by utilizing double-swelling cement. In a traditional method, the speed of pouring the large dam is very slow and the construction cost is very high by utilizing sectional and block pouring manners. According to the method for pouring the large dam by utilizing the double-swelling cement, disclosed by the invention, the SO3 content of the adopted cement is within 2.8-3.5%, the content of magnesium oxide in a clinker is within 4.0-6.0%, and hydration heat meets requirements of hot cement in GB200-2003. The method is characterized in that fly ash or grinded mineral slag is added when concrete is mixed, flake ice replaces mixing water for pre-cooling aggregate, an additive is simultaneously added, and a cooling water pipe is embedded in the poured concrete. During pouring, a distribution, high-lift and continuous pouring construction method replaces a traditional sectional, block and grouting construction method. The method for pouring the large dam by utilizing the double-swelling cement, disclosed by the invention, has the advantages of largely increasing construction speed, reducing construction cost and improving social benefits and economical benefits remarkably.

Description

technical field [0001] The invention belongs to the technical field of concrete dam body construction in water conservancy and hydropower projects, and in particular relates to a method for pouring a dam by using double-expansion cement. Background technique [0002] Due to the volume shrinkage of cement concrete during the hardening process, especially the cold shrinkage, the shrinkage stress will be generated inside the concrete. After reaching a certain value, it will cause local damage and cracks. This is the main reason for the cracks in the dam. This is a very difficult problem for the dam, which has not been completely solved so far, so there is a saying that "no dam will not break". Scientists and engineers at home and abroad have done a lot of research and experiments in this field for decades, and put forward many effective methods. [0003] In terms of dam pouring technology, the traditional method is to adopt segmental and block pouring, and at the same time ado...

Claims

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Application Information

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IPC IPC(8): E02D15/00
Inventor 楼宗汉陈胡星吴超寰陈双权徐合林
Owner ZHEJIANG UNIV
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