Mass concrete-based temperature field research method and temperature control method

A large-volume concrete and temperature control method technology, applied in the direction of thermometers, thermometer applications, instruments, etc., can solve the problem of not being able to provide temperature control methods for mass concrete pouring temperature control, and being unable to grasp the temperature distribution law and mechanism characteristics of the temperature field. Affect the quality of concrete pouring and the safety of the entire project, so as to avoid the waste of cooling resources, ensure the overall quality of the project, and ensure the quality of pouring

Inactive Publication Date: 2018-06-08
CHINA RAILWAY 12TH BUREAU GRP +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to: in the process of large-scale concrete pouring, because the temperature distribution law and mechanism characteristics of the temperature field cannot be grasped, the influencing factors of the heat of hydration of concrete, and the influencing results and laws of the influencing factors cannot be determined, resulting in the inability to Provide an effective temperature control method to control the temperature of mass concrete pouring, so that cracks often appear in the mass concrete structure, affecting the quality of concrete pouring and the safety of the entire project. Provide a research method and temperature control base

Method used

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  • Mass concrete-based temperature field research method and temperature control method
  • Mass concrete-based temperature field research method and temperature control method

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Experimental program
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Embodiment 1

[0107] Such as figure 1 As shown, the temperature field research method based on mass concrete includes the following steps:

[0108] a. Establish a mass concrete entity research object, and arrange cooling water pipes in the entity research object for cooling;

[0109] b. Measure the temperature of the entity research object during the pouring process, arrange multiple measuring points, measure and collect the temperature of each measuring point within the set time interval;

[0110] c. Draw the temperature change curve of each measuring point in each time period to obtain the temperature field characteristics and temperature change law of mass concrete;

[0111] d. Establish a finite element analysis model according to the entity research object, and calculate the temperature value corresponding to the measuring point of the finite element analysis model in the entity research object according to the analysis theory formula of the finite element analysis model; wherein, the...

Embodiment 2

[0127]Embodiment 2: This embodiment takes the steps in Embodiment 1 as an example to describe the operation process of the research method in detail. In this embodiment, the pier cap of a certain railway bridge in China is taken as an example for illustration, as figure 2 As shown in the figure, select a pier cap 7 in the figure, see the specific location figure 2 In the black spot that won the bid, the pier cap is a large-volume concrete structure.

[0128] The size of the pier abutment is 19.2m×13m×4m, and concrete with a volume greater than 1 cubic meter is limited to mass concrete. The strength grade of concrete is C40, and the dosage of each component in each cubic meter of concrete is: P.42.6 (low alkali) cement 291kg, sand 750kg, stone 1080kg, admixture (fly ash) 125kg, water reducer 4.16kg , Water 154kg. Steel formwork is used during construction, and two layers of cooling water pipes are pre-arranged in the concrete pouring front cap, using DN50 (2-inch pipe) gal...

Embodiment 3

[0195] Embodiment 3: In this embodiment, the research method is obtained based on the research method of the mass concrete temperature field, and the factors affecting the heat of hydration of the mass concrete are analyzed and studied. Still taking the pier cap of Example 2 as the object, the influence of cement type and dosage on the heat of hydration of mass concrete is analyzed, and a finite element model is also established for analysis.

[0196] Analyze the impact of cement varieties on the heat of hydration of mass concrete. According to the situation of the pier cap in Example 2, the amount of cement used per cubic meter of concrete is 291kg. In the absence of cooling water pipes, ordinary silicate is now selected. Cement, medium heat Portland cement, high early strength Portland cement, fly ash cement (20% fly ash), other calculation parameters remain unchanged, the finite element analysis model is established, and the numerical calculation is carried out. Concrete ce...

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Abstract

The invention discloses a mass concrete-based temperature field research method and a mass concrete-based temperature control method. The research method comprises the following steps of: establishinga mass concrete entity research object; measuring temperatures, in a pouring process, of a plurality of measurement points of the entity, and drawing corresponding temperature change curves to obtaintemperature field characteristics and a temperature change law; establishing a finite element analysis model according to the entity research object and automatically calculating temperatures of thecorresponding measurement points; adjusting temperature field calculation parameter of the model through comparing the calculated temperature values of the model with the actually measured temperaturevalues; and finally adjusting influence factors influencing hydration heat in a mass concrete model, carrying out analysis to obtain an influence result and an influence law, and adopting a corresponding temperature control method according to the result and the law. According to the mass concrete-based temperature field research method and the mass concrete-based temperature control method, fissures are prevented from occurring in mass concrete, and the pouring quality of concrete and the total quantity of projects are ensured.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a temperature field research method and a temperature control method based on mass concrete. Background technique [0002] In the early stage of concrete hardening, the chemical reaction between cement and water will release more heat, and the temperature of concrete will gradually increase. Common-sized concrete components have good heat dissipation conditions, the temperature difference between the inside and outside of the concrete is small, and the deformation of the entire component is basically the same, so serious hydration heat cracks will not occur. However, due to the large size of the mass concrete, the heat dissipation is slow, and the heat of hydration makes the internal temperature of the concrete rise significantly. "Code for Construction of Mass Concrete" (GB50496-2009) pointed out that mass concrete is a mass of concrete whose minimum geometric ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G01K13/10
CPCG01K13/10G06F30/13G06F30/23G06F2119/08
Inventor 白兆梓
Owner CHINA RAILWAY 12TH BUREAU GRP
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