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International Concrete Abstracts Portal

Showing 1-2 of 2 Abstracts search results

Document: 

18-461

Date: 

November 1, 2019

Author(s):

Chaomei Meng, Liangcai Cai, and Guanhu Wang

Publication:

Materials Journal

Volume:

116

Issue:

6

Abstract:

Continuously reinforced concrete pavement (CRCP) has superior durability and mechanical performance over jointed plain concrete pavement (JPCP) without preset joints. However, there are many small cracks in CRCP under environmental loading. Crack width of CRCP is the one of most important factors for pavement design, and it directly influences durability. Therefore, an approximate model is developed to predict crack width and stresses of CRCP under temperature loading. Furthermore, the effect of influenced parameters on crack width is discussed. The results show that axial components account for a great proportion of thermal stress, compared to curling stress. Reinforcement ratio and diameter of reinforcement have significant influence on crack width. Increasing reinforcement ratio, while decreasing diameter of reinforcement can decrease crack width. Adhesive strength between concrete and reinforcement influences crack width, too. Higher adhesive strength can reduce crack width. Moreover, thicknesses of pavement, tensile strength, and elastic modulus of concrete also have an effect on crack width. Improvement of the tensile strength of concrete would widen the crack width, but lengthen the spacing between adjacent cracks. Both thicker pavement and higher elastic modulus of concrete introduce wider crack widths but improve bearing capacity. Therefore, a larger reinforcement ratio but smaller diameter of reinforcement with deformation, and a lower elastic modulus of concrete pavement with larger thickness are recommended.

DOI:

10.14359/51718064


Document: 

110-M02

Date: 

January 1, 2013

Author(s):

Boo-Hyun Nam, Chul Suh, and Moon C. Won

Publication:

Materials Journal

Volume:

110

Issue:

1

Abstract:

Thin concrete pavement overlay placed on the top of flexible pavements is referred to as a thin whitetopping (TWT) pavement, which is one of the rehabilitation treatments for deteriorated flexible pavements. The primary goal of this study is to evaluate the fatigue performance of full-scale TWT pavement due to repeated traffic loading. Super-accelerated pavement (SAP) tests on full-scale TWT concrete slabs were performed under static and constant cyclic loading. The stationary dynamic deflectometer (SDD) (a truck-mounted SAP testing device) was used to statically and dynamically load the TWT slabs. To monitor the response of the TWT slabs, accelerometers and linear variable differential transformers (LVDTs) were installed and the dynamic displacements of slabs were recorded during the entire testing period. The test results show that the tested slabs have dynamic displacement peaks around the number of load repetitions corresponding to the first visible cracks. The dynamic displacement increased at a higher rate after the occurrences of the first visible crack. In addition, the tested slabs showed a stress redistribution phenomenon during the crack propagation. The concepts of the stress level and equivalent fatigue life were used to eliminate, in part, influences of other factors (that is, the water-cement ratio [w/c] and aggregate type and gradation) and correct the effect of different stress ratios, respectively. The S-N curve developed from this study was very close to Thompson and Barenburg’s S-N curve after the application of the equivalent fatigue-life concept.

DOI:

10.14359/51684362


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