Wang Shui-yin

Bio: Wang Shui-yin is an academic researcher from Ontario Ministry of Transportation. The author has contributed to research in topics: Asphalt & Surface layer. The author has an hindex of 2, co-authored 2 publications receiving 8 citations.

Influence factors of bond performance between asphalt surface layer and semi-rigid base

Abstract: Referring to foreign LPDS shear test method,the influence of asphalt mixture,sticky layer material,semi-rigid base material,the interface of asphalt mixture and sticky layer material,the interface of viscous layer material and semi-rigid base on the shear strength between asphalt surface layer and semi-rigid base was studied with self-designed interior direct shear test and oblique shear test.The shear strength and the unit shear strength were the test evaluation indexes.It is shown that increasing the maximum nominal size and the compactness of asphalt mixture can improve interlayer bond strength.High strength,coarse and dense semi-rigid material can improve interlayer bond strength.Viscosity isn't main influence factor to select viscous layer materials,but the species and doses of viscous layer materials should be selected according to engineering practice test.Cleaning the surface of semi-rigid base is an important measure to improve bond interlayer's level.Prime coat should be sprinkled with 0.3~0.6 L·m-2 after the surface of semi-rigid base is cleaned.Casting single particle size,coarse specification and alkaline crushed stone above interlayer hot asphalt is easy to construct,and can improve interlayer bond strength.15 tabs,6 figs,10 refs.

Asphalt Concrete Gap Gradation

Abstract: On the basis of lots of theories and experiment analysis,mechanical property and gradation characteristics of asphalt mixture with gap gradation are studied.Meanwhile,the differences between gap gradation and complete gap gradation are compared in mechanical property of asphalt concrete.Thus it is seen that asphalt mixture with gap gradation is suitable for asphalt pavement of high-class highway.

Characterization of bonding property in asphalt pavement interlayer: A review

Abstract: Higher requirements are put forward for interlayer bonding property with the increase of traffic load, including bearing capacity and durability. Typical diseases caused by insufficient adhesion between layers are slippage cracking, de-bonding and pavement deformation. The correct characterization of bonding property becomes necessary with evolving concerns of interlayer failure and material innovations. In the past forty years, many researches have focused on the evaluation of interlayer bonding property, and some valuable conclusions have been drawn. In this review, the mechanism, evaluation method and influencing factors of the interlayer bond strength are reviewed. The common test equipment can be classified into the shear, pull-off and torsion test. Different influence factors are analyzed including tack coat property, temperature, asphalt aging and surface condition. It is recommended to select the appropriate tack coat rate, and apply the tack coat under the conditions of clean, dry, high surface texture and good compaction. However, the interlayer failure mechanism and the interaction between the different influencing factors need to be further studied. The future work can focus on the correlation between different test methods and evaluation parameters, which would address the lack of harmonization or consistency among various evaluation approaches. Meanwhile, it is significant to add the evaluation of interlayer bonding property into the system of pavement design.

Research of Test of Shear Resistance of Modified Emulsified Asphalt by Waterborne Epoxy Resin

Abstract: In view of diseases like slippage and surge of pavement structure that result from being lack of interlayer cohesive force performance of asphalt pavement, interlayer shear stress of five kinds of typical pavement structure was calculated by means of finite element software Ansys; the shear fatigue performance and shear strength performance of epoxy emulsified asphalt were tested on the basis of calculation of interlayer maximum shear stress and shear strength. Results indicate that the shear strength increases with the increase of normal stress by approximate linearly trend; the optimum epoxy emulsified asphalt distributing amount is 0.8kg/m2 under the high temperature of 60℃; the shear strength decreases with the increase of temperature, while the distributing amount and normal stress are the same, in fact, it is mainly caused by the decrease of cohesive force; the maximum interlayer shear stress under the loads of 100kN and 200kN are less than allowable shear stress and shear strength, shear fatigue damage and ultimate shear failure under the condition of high temperature and heavy load will not be generated on the asphalt surface course.

Quality Assessment of Milling Pavement Surface Using 3D Line Laser Technology

Abstract: To ensure that a regular milled surface texture provides good bonding without residual distress, a new specification of milling surface assessment has been established for quantitatively evaluating the milled surface quality. This research explores the possibility of using three-dimensional (3D) laser scanning technology to develop an algorithm to obtain a milled surface model that can measure evaluating indicators, milling depth and texture depth, and identify poorly milled areas. A case study was conducted by using a laser scanning vehicular system to collect 3D continuous pavement transverse profiles data in a 500 m long segment of Highway S107. The results show that the proposed method is very promising and can measure the milling depth and texture depth to effectively and quantitatively differentiate between good- (milling depth between 47 mm and 53 mm and texture depth exceeding 2 mm) and poor-quality work. Moreover, the poorly milled areas such as those with residual distress and unmilled areas that will lead to premature failure can also be identified using the proposed method. The proposed method can effectively support remilling work and ensure the quality of the overlay pavement.

Method using three-control-point twin curves for determining a mineral aggregate gradation structure

Abstract: A method using three-control-point twin curves for determining a mineral aggregate gradation structure comprises the following steps: (1) determining, on the basis of the nature of the mixture, three control points which are, respectively, the nominal greatest particle diameter and pass rate thereof, the nominal least particle diameter and pass rate thereof, and the coarse/fine discontinuity point nominal particle diameter and pass rate thereof; (2) choosing, for the coarse aggregate gradation curve and fine aggregate gradation curve respectively, a power function model, an exponential function model and a logarithmic function model; (3) measuring the tamping density and voids in mineral aggregate (VMA) of the mixture and selecting, according to engineering requirements, a coarse aggregate gradation and a fine aggregate gradation. The method allows for rational selection of gradation formats on the basis of proportional design requirements for asphalt mixtures and enables realization of optimal performance of mixture minerals on the basis of the characteristics of mixtures of materials from different areas and different origins and the option to build different gradation curves.

Quality control of micro-milling treatment on tunnel concrete pavement using 3D range data

Abstract: Use of micro-milling and thin dense-graded flame-retardant asphalt overlay in long tunnel concrete pavement is a relatively new technique in China. Earlier research showed that the micro-milling qu...