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Method for constituting model for predicting thermal diffusivity of normal concrete along with development of age

A common concrete and predictive model technology, applied in the field of concrete construction, can solve problems such as thermal conductivity and temperature field deviation without consideration

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

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Problems solved by technology

If the characteristics of the thermal conductivity with the age development are not considered in the simulation calculation of the early temperature field of concrete, the calculated temperature field will deviate from the actual situation

Method used

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  • Method for constituting model for predicting thermal diffusivity of normal concrete along with development of age
  • Method for constituting model for predicting thermal diffusivity of normal concrete along with development of age
  • Method for constituting model for predicting thermal diffusivity of normal concrete along with development of age

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Embodiment Construction

[0018] The invention will be further described below in conjunction with the description, but the scope of protection required by the present invention is not limited to the scope described in the embodiments.

[0019] 1. Test overview

[0020] 1.1 Test raw materials

[0021] Cement Conch brand P.O42.5 ordinary Portland cement;

[0022] Sand and river sand, the fineness modulus is 2.3, and the grain distribution is good;

[0023] Gravel 5 ~ 20mm gravel, continuous grading.

[0024] 1.2 Test plan

[0025] The size of the specimen is 150mm×150mm×300mm, and the concrete mix ratio used is shown in Table 1. After the pouring is completed, quickly move the specimen into the standard curing room for curing, and measure the thermal conductivity of the concrete every 1.5 hours.

[0026] Table 1 The amount of each material in concrete

[0027]

[0028] 1.3 Analysis of test data

[0029] Data analysis and graphing were performed using Origin software.

[0030] 2. Result analys...

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Abstract

The invention discloses a method for constituting a model for predicting the thermal diffusivity (alpha) of normal concrete along with the development of age (t). The invention studies the change rule of the thermal diffusivity (alpha) of the concrete with different water-cement ratios, admixtures, cement types, sand ratios and aggregate contents along with the development of the age (t), and establishes the model for predicting the thermal diffusivity (alpha) of the normal concrete along with the development of the age (t) according to the common rule of the thermal diffusivity (alpha) of the concrete along with the development of the age (t) under the different working conditions. The model is shown in a formula (as in the drawing). In the formula, alpha (t) is the value of the thermal diffusivity of the concrete at the age of t and has a measurement unit of m<2> / h; and alpha (t) is the value of the thermal diffusivity of reinforced concrete and has a measurement unit of m<2> / h; andt is the age and is measured by hour. The model can well represent the change rule of the thermal diffusivity (alpha) of the normal concrete along with the development of the age (t).

Description

technical field [0001] The invention relates to a method for predicting the thermal conductivity of ordinary concrete changing with age, and belongs to the field of concrete construction. Background technique [0002] In the field of civil engineering, many different computational models have been developed to predict the temperature and stress distribution of hardening concrete. Regardless of the use of a simple one-dimensional or complex three-dimensional heat conduction calculation model, the key thermal performance parameter required in the calculation - the temperature conductivity coefficient is a function of time. If the characteristics of the thermal conductivity with the age development are not considered in the simulation calculation of the early temperature field of concrete, the calculated temperature field will deviate from the actual situation. Therefore, only by finding out the change law of thermal conductivity with age and proposing a reliable prediction mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/38
Inventor 沈德建吴胜兴李杰贾德庆佘小颉
Owner HOHAI UNIV
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