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Research on Durability Evaluation Method of Cement Concrete Pavement

Author: AnFengWei
Tutor: ZhangQing
School: Chang'an University
Course: Road and Railway Engineering
Keywords: Cement Concrete Pavement Evaluation Evaluation system Fracture toughness Flexural tensile strength Dislocation estimates Void forecast Scour Durability
CLC: U416.216
Type: Master's thesis
Year: 2011
Downloads: 105
Quote: 0
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Abstract


Currently, the cement concrete pavement early serious diseases, diseases caused by the lack of pavement durability has seriously hampered the development of the cement pavement. Existing cement pavement durability evaluation system is not perfect, can not meet the requirements of the development of cement pavement, an urgent need for a comprehensive evaluation system to evaluate the pavement, pavement design, maintenance, repair, and other reference. Evaluation system is perfect road, pavement cracks, broken plates, Void, starting wrong station several typical diseases caused by pavement durability inadequate analysis of the generation mechanism and influence factors of the disease; composed of material and structure from the road proposed durability evaluation, establish the the durability evaluation system of cement concrete pavement. In this paper, the fracture toughness, flexural strength and the base material erosion coefficient as a material resistant to Dutch evaluation indicators. Come meet durability quadratic orthogonal regression experimental analysis the Nijhuis indicators and material mix design recommended value. Weather resistance, studies air content is the main factor to control erosion performance of material antifreeze and salt freezing air content as frost durability control indicators, given the value of the gas content of pavement materials meet weatherability range. Structural durability to the radius of the Void Slab Hollow evaluation optimize the erosion Void prediction model, the radius of the state of the road damage classification Slab Hollow; road dislocation dislocation amount Evaluation and analysis of semi-rigid base dislocation mechanism, right or wrong sets the amount of the estimated dislocation, the relationship between the standard axis the number of loads and erosion coefficient; joint load transfer dowel loose direct load transfer attenuation proposed to consider the loose amount seam load transfer capacity formula to reduce the attenuation of the load transfer capability by controlling the dowel bar diameter and foundation modulus; generated for the rigid base pavement temperature warping effect The severity of the cracking condition, thickness, temperature gradient, grassroots modulus of the panel work performance, proposed to control the temperature of the plate thickness and base modulus warp, to improve the durability of the pavement. Based on the above analysis, the proposed the pavement durability evaluation system and evaluation processes. Finally, from the material, with the ratio and structural design, the proposed measures to improve the cement durability.

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Pavement Engineering > Road : use of the material points > Cement concrete pavement
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