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Method for determining allowable value of dry shrinkage strain and temperature shrinkage coefficient of continuous reinforcement concrete

A technology of reinforced concrete and dry shrinkage strain, which is applied to the direction of coagulation pavement paved on site, roads, road reinforcements, etc., which can solve the lack of concrete dry shrinkage strain, the inability to control the width of CRCP cracks and the number of thrusts, and the inability to Optimal design and other issues

Inactive Publication Date: 2016-08-17
CHANGAN UNIV
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Problems solved by technology

However, there is still a lack of quantitative determination methods for the allowable values ​​of the dry shrinkage strain and temperature shrinkage coefficient of concrete, so the composition of continuously reinforced concrete cannot be optimally designed based on the allowable values, and the crack width and burst number of CRCP cannot be controlled.

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  • Method for determining allowable value of dry shrinkage strain and temperature shrinkage coefficient of continuous reinforcement concrete
  • Method for determining allowable value of dry shrinkage strain and temperature shrinkage coefficient of continuous reinforcement concrete
  • Method for determining allowable value of dry shrinkage strain and temperature shrinkage coefficient of continuous reinforcement concrete

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[0038] The present invention will be further described below in conjunction with accompanying drawing.

[0039] see figure 1 , the present invention comprises the following steps:

[0040] Step 1. The value of the basic parameters of the continuous reinforced concrete pavement:

[0041] That is, to determine the concrete elastic modulus E c =3×10 10 Pa, steel elastic modulus E s =2×10 11 Pa, steel bar diameter d s =0.016m, longitudinal steel bar spacing b=0.12m, steel bar temperature shrinkage coefficient α s =9×10 -6 / ℃, the bond stiffness coefficient k between steel bar and concrete s =3×10 10 Pa / m, frictional resistance coefficient k between the base layer and the surface layer c =5×10 7 Pa / m, temperature drop ΔT=30℃, crack spacing L=1.5m, cross-sectional area of ​​reinforcement A s =2.01×10 -4 m 2 , concrete area A c =0.0288m 2 .

[0042] Step 2. Determination of the allowable value of the crack width:

[0043] With comprehensive reference to my country's...

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Abstract

The invention discloses a method for determining allowable values of a dry shrinkage strain and a temperature shrinkage coefficient of continuous reinforcement concrete. The allowable values of the dry shrinkage strain and the temperature shrinkage coefficient are calculated based on a continuous reinforcement concrete pavement displacement calculation formula and a relation between the dry shrinkage strain and the temperature shrinkage coefficient, and a blank in the method for determining the dry shrinkage strain and the temperature shrinkage coefficient of the continuous reinforcement concrete at present is filled. After the allowable values of the dry shrinkage strain and the temperature shrinkage coefficient are determined, the allowable values can be used for guiding the structural design of the continuous reinforcement concrete pavement and the component design of concrete materials, the crack width of the continuous reinforcement concrete can be guaranteed to be smaller than the allowable value and thus the thrust of the continuous reinforcement concrete pavement is controlled. The method for determining the dry shrinkage strain and the temperature shrinkage coefficient of the continuous reinforcement concrete has the advantages of simple step, definite formula, clear thought and higher calculation accuracy.

Description

technical field [0001] The invention belongs to the field of continuously reinforced concrete pavement, and in particular relates to a method for determining allowable values ​​of dry shrinkage strain and temperature shrinkage coefficient of continuously reinforced concrete. Background technique [0002] Continuously reinforced concrete pavement (referred to as CRCP) is equipped with continuous steel bars in the longitudinal direction without joints. It has the characteristics of good integrity, smooth and comfortable driving, long service life, low maintenance cost, full life cycle, and reasonable economic benefits. It is suitable for High-grade highways and heavy-duty highways have been widely used at home and abroad in recent years. [0003] Thrust is the most important disease of continuously reinforced concrete pavement. It refers to the area enclosed by two transverse cracks with a small distance (less than 0.6m), short longitudinal cracks and the edge of the road (or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C7/14E01C11/18
CPCE01C7/14E01C11/18
Inventor 张洪亮余进洋何磊磊张永平苏曼曼
Owner CHANGAN UNIV
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