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Construction method of large-volume concrete in severe cold areas

A large-volume concrete and construction method technology, which is applied in the processing of building materials, construction, building construction, etc., can solve the problems of unsatisfactory concrete insulation effect, achieve the effect of ensuring mixing quality and reducing freezing

Inactive Publication Date: 2018-12-14
CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD +1
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AI Technical Summary

Problems solved by technology

[0010] The thermal insulation effect of concrete is not ideal if only the thermal insulation measures of the thermal insulation layer are adopted.

Method used

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Experimental program
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Embodiment

[0034] A winter mass concrete construction method in severe cold areas, comprising the following steps:

[0035] Step 1: Concrete raw material mixing scheme design, using high-efficiency water reducing agent and air-entraining agent combined as the concrete admixture, and then adding Class I fly ash, wherein the concrete raw materials include: 300-350 parts of cement, 1800 - 1900 parts of sand and gravel aggregate, 120-150 parts of water, 30-40 parts of Class I fly ash, 2-2.2 parts of high-efficiency water reducer and 0.12-0.13 parts of high-efficiency air-entraining agent, the above-mentioned components by mass;

[0036] Step 2: thermal insulation storage of concrete raw materials;

[0037] Step 2.1: The top and surrounding areas of the aggregate silo are sealed with color steel plates. The sand and gravel aggregates in the aggregate silo are stored in a centralized stacking method, and the stacking height is greater than 4m. During construction, first select To pile up san...

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Abstract

The invention discloses a construction method of large-volume concrete in severe cold areas, which comprises the steps of 1, mix proportion design of concrete raw materials; 2, heat preservation storage of the concrete raw materials, wherein the step further comprises the sub-steps of 2.1, heat preservation storage of gravel aggregates, and 2.2, storage and heating of water by adopting an electricheating water tank; 3, mixing of the concrete raw materials; 4, concrete transportation; 5, concrete pouring; and 6, concrete maintenance. According to the construction method of large-volume concrete in the severe cold areas, heat preservation can be performed on the concrete forming process through setting the measures of performing heat preservation on the concrete raw materials, performing heat preservation on the raw material mixing process, performing heat preservation on concrete transportation and pouring and performing heat preservation on concrete maintenance, thereby ensuring the mixing quality, the pouring quality and the forming quality of the concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete construction methods, and relates to the construction of large-volume concrete in cold environments, in particular to a construction method of large-volume concrete in severe cold regions in winter. Background technique [0002] Since the late 1930s, construction of large-volume concrete in low-temperature seasons has been common in foreign countries. It was first used in the construction of the Dnieper Hydropower Station in the former Soviet Union. Almost all the concrete in this project was completed in the greenhouse, and with the development of the plastics industry With the rapid development, the construction scope of the greenhouse method is expanding day by day. Inflatable greenhouses have also been successfully adopted, and the temperature inside the greenhouse can reach 20°C, which is suitable for concrete maintenance requirements, and the working environment for workers is also relativel...

Claims

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Application Information

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IPC IPC(8): E04G21/02E04G21/28
CPCE04G21/02E04G21/28
Inventor 李清伟高海成余良碧刘现成张宇
Owner CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD
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