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Method for constructing prediction model of heat conductivity coefficient of fully-graded concrete

A technology of thermal conductivity and prediction model, which is applied in the field of concrete construction, can solve the problems of large aggregate and specimen volume, no research model proposed, difficult thermal conductivity, etc.

Inactive Publication Date: 2011-08-24
HOHAI UNIV
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Problems solved by technology

[0004] For fully graded concrete, due to the large volume of aggregates and specimens, it is difficult to accurately measure the thermal conductivity of the existing technology, whether it is a transient method or a steady state method, and its research model has not yet been proposed.

Method used

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  • Method for constructing prediction model of heat conductivity coefficient of fully-graded concrete
  • Method for constructing prediction model of heat conductivity coefficient of fully-graded concrete
  • Method for constructing prediction model of heat conductivity coefficient of fully-graded concrete

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Embodiment Construction

[0062]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.

[0063] Thermal Conductivity Test of Cement-Based Composite Materials

[0064] Test raw materials:

[0065] Cement Conch brand P.O42.5 fully graded Portland cement;

[0066] Sand River sand, with a fineness modulus of 2.3 and good particle gradation;

[0067] Granite slab..thickness is 10mm and 15mm;

[0068] Experimental protocol

[0069] The measuring device adopts the device developed by our research group, see patent ZL200810122928 for details. The size of the test piece is 150mm×150mm×300mm. The mortar mix ratio used is shown in Table 1. The combination conditions of composite materials are shown in Table 2. The schematic diagram of composite materials is shown in Image 6 . After the pouring is completed, quickly move the specimen into the standard curing roo...

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Abstract

The invention discloses a method for constructing a prediction model of a heat conductivity coefficient of fully-graded concrete. A difficult point that the heat conductivity coefficient of the fully-graded concrete is hard to measure in a test during the heat conductivity coefficient research is simplified; by considering general characteristics of the fully-graded concrete and common concrete, the research is started from the common concrete; the heat conductivity coefficient of a common concrete test piece under different combined working conditions is measured based on composition materials of the concrete, and the heat conductivity coefficient of the concrete is predicted according to heat conductivity coefficients and a ratio of the materials; and the prediction model of the heat conductivity coefficient of the fully-graded concrete is gradually constructed by taking a size factor of the aggregate size into consideration. The method comprises the following specific steps of: establishing a series model of the heat conductivity coefficient; establishing a parallel model of the heat conductivity coefficient; and finally establishing a model of the heat conductivity coefficientof the fully-graded concrete based on the series and the parallel models. The prediction model can better represent a relation discipline of the heat conductivity coefficient of the fully-graded concrete and the heat conductivity coefficients of the composition materials of the concrete.

Description

technical field [0001] The invention relates to a method for predicting the thermal conductivity of fully graded concrete, which belongs to the field of concrete construction. Background technique [0002] In the field of civil engineering, the crack control of concrete has always been one of the problems that plague engineers and technicians. Since it cannot be solved perfectly, concrete cracking is very common, especially in fully graded concrete. The huge volume makes the internal hydration during the hydration process The heat cannot be dissipated in time, and the structural failure and durability problems caused by early cracks in engineering are becoming more and more prominent. The deformation caused by the temperature field of concrete is an important reason for its cracking. As an important thermophysical parameter in the study of concrete temperature field, thermal conductivity has been valued by scholars from all over the world, and its accuracy directly affect...

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Application Information

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IPC IPC(8): G01N25/20
Inventor 吴胜兴沈德建贾德庆栾澔魏珍中
Owner HOHAI UNIV
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