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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-3 of 3 Abstracts search results
September 1, 2020
Chaomei Meng, Liangcai Cai, Guanhu Wang, Xingang Shi, and Jianming Ling
Cross-tensioned prestressed concrete pavement (CTPCP) has superior mechanical and durable performance over ordinary concrete pavement. An approximate model to predict stresses and displacement of CTPCP under temperature loading is developed. Elasticplastic model is adopted to describe the performance of sliding layer between CTPCP and subgrade. The stresses in concrete are divided into friction introduced, curling, and prestressed components. Friction introduced component is obtained with the equivalent equation of CTPCP and curling component is obtained with Westergaard solution for concrete pavement with infinite length but finite width. Furthermore, influences of parameters, including length and thickness of slab, elastic modulus of concrete, frictional coefficient, space, angle and position of prestressed strands
and reaction modulus of subgrade, on stresses and displacements are discussed. Results show that decreasing length and thickness of pavement, frictional coefficient, and elastic modulus of concrete are effective ways to reduce stress under temperature loading. Furthermore, decreasing space but increasing diameter of prestressed strands is another way to prevent too large tensile stress in CTPCP. Additionally, it seems to be more concise that the perfect plastic model is adopted to predict friction introduced stress in engineering application after comparative analysis of difference between to bilinear model and plastic model.
November 1, 2019
Chaomei Meng, Liangcai Cai, and Guanhu Wang
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.
January 1, 2013
Boo-Hyun Nam, Chul Suh, and Moon C. Won
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.
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