A construction method of large-volume non-cooling tubular concrete

A construction method, no cooling technology, used in thermometers, thermometer applications, instruments, etc., to achieve excellent crack resistance, good volume stability, and the effect of preventing cracks

Active Publication Date: 2011-12-28
四川路桥建设集团股份有限公司
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Problems solved by technology

The purpose of the present invention is to overcome the disadvantages of using cooling water pipes to coo...

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  • A construction method of large-volume non-cooling tubular concrete
  • A construction method of large-volume non-cooling tubular concrete
  • A construction method of large-volume non-cooling tubular concrete

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[0039] The present invention is described in detail below in conjunction with accompanying drawing:

[0040] A: Preparation of raw materials: In order to make the early strength of the concrete body high, the fineness of the cement should be less than 0.04mm; Cement: In large-volume concrete, the temperature difference is mainly caused by the heat release of cement hydration, therefore, low heat release should be selected Since the fineness of cement will affect the heat release rate of the heat of hydration, the fineness of the cement should be appropriately reduced without affecting the activity of the cement. Cement: Conch brand P.042.5 cement (ordinary silicic acid Salt).

[0041] Fly ash, water demand ratio 98%; admixture. Fly ash can improve the workability of concrete, greatly improve the working performance and durability of concrete, and replace cement can reduce the heat of hydration, but when the amount of fly ash is large, it will have a greater impact on the ear...

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Abstract

The invention discloses a construction method for mass pipe concrete without temperature reduction. The construction method is characterized by comprising the following steps: A. proportioning and preparation of raw materials; B. temperature control; C. construction of concrete; and D. heat preservation and curing operations. When the proportioning is designed, cement with low heat release is selected, and the cement is mixed with a large quantity of fly ash mineral mixtures and mixed with an extrusion delayed coagulation type admixture, thereby effectively reducing the temperature rise of the concrete. Based on in-situ temperature monitoring, the highest temperature of each layer of concrete is about 60 DEG C, and the maximum temperature difference is less than 25 DEG C; the crack resistance of the concrete C40 prepared by blending the fly ash and the extrusion type admixture reaches the grade II, and the concrete has excellent crack resistance; and the shrinkage rate in 60d is only 2.3*10<-4>, and the volume stability is good. In the construction of the mass concrete, the corresponding construction processes are formulated so as to effectively prevent cracks from occurring.

Description

technical field [0001] The invention relates to the field of construction, in particular to a large-volume non-cooling tube concrete construction method. Background technique [0002] The super-large bridge cap is a large-volume concrete structure. The strength grade of the concrete is generally C40, and the concrete volume is quite large. Special measures must be taken to prevent temperature cracks due to the temperature rise of the concrete hydration heat, so as to meet the durability design requirements of the bridge and ensure Long-term healthy and safe use of the bridge. The general method is to use cooling water pipes to cool down. However, this method cannot solve the problem well due to the following disadvantages: (1) Embedding cooling water pipes in large-volume concrete will cause unrealistic grouting. The problem is that moisture and air are easy to seep in, resulting in corrosion of steel cooling water pipes and steel bars, which affects the bearing capacity of...

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Application Information

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IPC IPC(8): E04G21/02E04G21/08C04B28/00G01K13/10
Inventor 刘小波裴宾嘉冉光永张容向东周密丁庆军董武斌汪捍东王芳张卫红李青培
Owner 四川路桥建设集团股份有限公司
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