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Concrete admixture suitable for cold and dry environment and its preparation method and application

A concrete and drying technology, applied in the fields of water conservancy and hydropower, civil engineering, and transportation engineering, can solve the problems of increasing difficulty in quality control, complicated construction procedures, restricting the progress of engineering construction, etc., to reduce procurement links, simplify construction procedures, and ease supply. nervous effect

Active Publication Date: 2021-04-09
华电西藏能源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (2) The existing mineral admixtures are not suitable for cold and dry environments. In order to improve the service life of concrete projects in cold and dry environments, a variety of technical means are usually used, including adding various functional admixtures (anti- Refrigerant, air-entraining agent, internal curing agent), and measures such as heat preservation and moisturizing maintenance are adopted outside the structure. The more technical links, the more complicated the construction procedure, the more difficult the quality control, and even restricting the progress of the project construction

Method used

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  • Concrete admixture suitable for cold and dry environment and its preparation method and application
  • Concrete admixture suitable for cold and dry environment and its preparation method and application
  • Concrete admixture suitable for cold and dry environment and its preparation method and application

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Embodiment 1

[0036] Example 1: A hydropower project is located in the Shannan area of ​​Tibet, with an altitude of 3500km. The climate is cold and dry in winter, and the concrete freeze-thaw cycle is frequent. It is necessary to prepare normal concrete with a design index of C25W8F200. The local tuff is rich in minerals, which belongs to the black-green metamorphic oblique basaltic crystal clastic tuff, and its total content of silicon oxide, aluminum oxide and iron oxide is 87.6%. After grinding, the apparent density of the powder is 2800kg / m 3 , the fineness is 16%, the water demand ratio is 101%, the loss on ignition is 2.2%, the water content is 0.2%, the activity index is 61.5%, the stability (boiling method) is qualified, and the pozzolanic activity is qualified.

[0037] The activity index of tuff powder is low, and when it is used alone as a concrete mineral admixture, it will significantly reduce the strength of concrete, increase dry shrinkage deformation, and easily cause cracki...

Embodiment 2

[0042] Embodiment 2: simultaneously, utilize the tuff powder of embodiment 1, adjust its raw material ratio, prepare the concrete admixture B that is applicable to cold and dry environment, its specific preparation method is as follows:

[0043] (1) Grind the tuff ore into a uniform fine powder with a specific surface area of ​​550m 2 / kg, take 70 copies;

[0044] (2) Type I magnesium oxide expansion agent, the active reaction time is 105s (DL / T 5296-2013 "Technical Specifications for Mixing Magnesium Oxide in Hydraulic Concrete"), take 11 parts;

[0045] (3) Calcium formate, sodium polyacrylate (fineness 200 mesh), polyvinyl alcohol, sodium lignosulfonate and sodium lauryl sulfate are all chemical powders, each taking 8.0 parts, 3.0 parts, 5.75 parts, and 2.0 parts and 0.25 parts;

[0046] (4) Stir the above powders evenly through mechanical mixing to make concrete admixture B suitable for cold and dry environments, store them dry, and prevent them from getting damp during ...

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Abstract

The invention provides a concrete admixture suitable for cold and dry environment, its preparation method and application. The concrete mineral admixture includes the following parts by weight: 60-90 parts of tuff powder, 5-16 parts of light-burned magnesium oxide, 5-15 parts of calcium formate, 1-5 parts of sodium polyacrylate, 2 parts of polyvinyl alcohol ~8 parts, 0.5~2.5 parts of sodium lignosulfonate and 0~0.4 parts of sodium lauryl sulfate are mixed powder. The concrete admixture in the present invention is easy to use, can replace the traditional mineral admixture, save the cement consumption of concrete, and improve the concrete admixture and hardening performance. In a cold and dry environment, it has the functions of concrete internal maintenance and air entrainment, improves the crack resistance and frost resistance of cement concrete, and greatly improves the long-term durability of concrete.

Description

technical field [0001] The invention relates to the fields of water conservancy and hydropower, civil engineering, traffic engineering and the like, in particular to a new type of concrete admixture suitable for cold and dry environments and its preparation method and application. Background technique [0002] Cement concrete has the engineering properties of ease of availability, versatility, adaptability, relative economy, and application of various structural types, and has become the most commonly used structural material in the world. At present, in the fields of water conservancy and hydropower, civil engineering and transportation, the working environment of cement concrete structures is becoming more and more severe, and the requirements for its early and long-term durability are also getting higher and higher, such as frost resistance and crack resistance. At the same time, the strength of modern concrete is usually relatively high, and the fineness of cement is get...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26
Inventor 李正平石妍蒋理李家正彭松涛李响田德智訾进甲陈亮邝亚力李新宇姜宏军朱瑞晨谢国帅陈琴
Owner 华电西藏能源有限公司