Environmental Adaptability of Epoxy Grouting Materials for Micro Cracks in Cast-in-place Cement Concrete for Bridge Deck Article

LU Youfu, WANG Chaohui, WANG Xuecheng, FAN Zhentong, XIAO Xudang

Materials Reports 2022,36(1 ):20090252 -7. DOI:10.11896/cldb.20090252

Abstract （361）

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Preparation and Performance of Cement Pavement Temperature-adjusting Phase Change Materials Under Low Temperature Article

ZHU Hongzhou, CHEN Ruipu, GOU Shan, WANG Daqian, HU Lanxin

Materials Reports 2021,35(14 ):14198 -14203. DOI:10.11896/cldb.20050159

Abstract （424）

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Research and Development of Relationship Between Aging Mechanism and Fatigue Properties of Asphalt Article

LIANG Bo, LAN Fang, ZHENG Jianlong

Materials Reports 2021,35(9 ):9083 -9096. DOI:10.11896/cldb.20010138

Abstract （1057）

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Influence of Asphalt Grade and Content on the Properties of RAP Mixtures Article

ZHU Yuefeng, SI Chundi, QIAO Yaning, LI Yanwei

Materials Reports 2021,35(6 ):6086 -6092. DOI:10.11896/cldb.19100237

Abstract （696）

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Estimation of Air Void Content of Dense Graded Water-covering Asphalt Layer Based on GPR Article

CUI Lilong, LING Tianqing, ZENG Fangui, LIANG Lijuan, LI Rukai

Materials Reports 2021,35(4 ):4092 -4098. DOI:10.11896/cldb.19120099

Abstract （460）

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Save In order to solve the problem that ground penetrating radar (GPR) can not predict the air void content of water-covering asphalt layer with metal plate reflection method, three kinds of FDTD numerical models of pavement structure with different incident angles of pulse are established to study the influence of the dispersion of pulse on the reflection coefficient of monochromatic wavelet. Under the assumption of dry-wet layers system, a nonlinear calculation algorithm is proposed based on the theory of full waveform inversion with the considering of the incident angle of pulse. The dielectric constant and air void content of dry asphalt layer can be obtained through the nonlinear calculation algorithm utilizing GPR when the surface of layer is covered water. The reliability of the algorithm is validated by employing FDTD numerical models of dry-wet layers system with seven different moisture contents as well as the laboratory test. The results show that in the range of incidence angle of three numerical models, the variation of reflection coefficient of monochromatic wavelet is very small, which can be regarded as a constant, meaning the excitation value of incident wavelet corresponding to each frequency is the same. The synthetic pulse reconstructed by nonlinear calculation algorithm match the real wave well. The error of dielectric constant estimated by metal plate reflection method and nonlinear calculation algorithm increases with the rising of moisture content of wet asphalt layer, while the error growth of nonlinear calculation algorithm is much smaller than that of metal plate reflection method. Compared with the metal plate reflection method, the relative error of the dielectric constant, the bulk specific density of asphalt mixture and the air void content obtained by the nonlinear calculation algorithm are reduced from 10.9% to 1.6%, from 4.6% to 1.1%, and from 24.9% to 7.2%, which proves the nonlinear calculation algorithm can effectively eliminate the influence of water covering on the asphalt layer to calculate the dielectric constant and air void content of dry asphalt layer accurately, providing an accurate and effective way for the real-time monitoring of asphalt layer compaction quality and intelligent compaction technology.

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Research Progress on Digital Image Evaluation Method of Homogeneity of Asphalt Mixture Article

ZHAO Yi, YANG Xuan, HAO Zengheng, LIANG Naixing, TIAN Yufeng

Materials Reports 2020,34(23 ):23088 -23099. DOI:10.11896/cldb.19070174

Abstract （687）

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Save Digital image processing technology is a forward-looking, intelligent technology, which has been widely used in industry, transportation, medicine and other fields. The homogeneity of asphalt mixture is directly related to the road performance and service life of asphalt pavement, which is one of the main factors leading to the early damage of asphalt pavement. The homogeneity evaluation method of asphalt mixture based on digital image processing technology has the characteristics of high detection frequency, low cost, convenient operation, strong objectivity, real-time continuous and so on, which has been concerned by many engineering researchers and builders.
When using digital image processing technology to evaluate the homogeneity of asphalt mixture, digital image processing and homogeneity algorithm are the key to determine the evaluation results. At present, researchers at home and abroad focus on image denoising technology, image threshold segmentation method, homogeneity evaluation method and other aspects have made rich research findings, For example,the influencing factors of image acquisition, the adaptability of image enhancement method, the segmentation principle of adhesive particles and the para-meters of aggregate recognition have been studied,and the aggregate distribution of asphalt mixture is analyzed by two-dimensional image technology or three-dimensional CT scanning technology, and the homogeneity algorithm, evaluation index and standard are emphatically analyzed to evaluate quantitatively the homogeneity of asphalt mixture. However, the digital image evaluation method and standard of homogeneity of asphalt mixture have not formed a unified standard at home and abroad. There are few reports on the rapid, real-time and continuous digital image eva-luation technology of the paving homogeneity and compaction homogeneity in the asphalt mixture construction process. Therefore, the digital image evaluation technology of homogeneity of asphalt mixture in image acquisition, digital image processing, homogeneity algorithm, real-time early warning feedback, program development and other aspects still need further exploration and research.
In this paper, the research progress and development direction of the digital image evaluation method of homogeneity of asphalt mixture are discussed for the digital image processing technology of asphalt mixture. Firstly, this paper summarizes the digital image processing technology of asphalt mixture at home and abroad. Then,the two-dimensional homogeneity evaluation methods of asphalt mixture paving surface and compacted asphalt mixture surface aggregate and the three-dimensional homogeneity evaluation method of compacted asphalt mixture structure aggregate are summarized. Finally,the problems and prospects in the study of the digital image processing technology of homogeneity of asphalt mixture are proposed, so as to to provide reference for the engineering application of asphalt mixture homogeneity digital image detection and evaluation technology.

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Research and Development Trend of Road Usage Phase Change Materials Article

LIU Tao, GUO Naisheng, TAN Yiqiu, YOU Zhanping, JIN Xin

Materials Reports 2020,34(23 ):23179 -23189. DOI:10.11896/cldb.19090191

Abstract （779）

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Save Since the phase change materials (PCMs) as building materials extensively, the diversity and function have been continuously developed, and the temperature regulation and energy saving is significant. PCMs are intelligent and spontaneous, and can effectively adjust temperature range of matrix materials, these characteristics are also applicable to the field of traffic materials, can be used for road temperature regulation to reduce temperature diseases. In addition, more road functionality adopted by using appropriate PCMs, such as snow melting, freeze-thaw resistance and reducing urban heat island effect, correspond to the sustainable development concept of intelligent transportation and green transportation in China.
However, research of PCMs of traffic materials is not mature yet, including application form of pavement and the selection of materials. Various PCMs can be divided into solid-solid and solid-liquid types according to the phase change morphology. Further, the solid-solid type has a very high phase change temperature, is difficult to meet the temperature requirements of road environment, but the solid-liquid phase with transformation of liquid morphology and volume will damage pavement structure. None of them can meet the requirements of temperature regulation effect and mechanical characteristics of phase change pavement. At present, the proposed solution is in combination with other materials.
The promising solutions include composite phase change materials (CPCMS), encapsulation, chemical bridging and microcapsule, etc. Physical adsorption can combine suitable matrix materials with solid-liquid phase change materials (SLPCMs) according to the demand. The encapsulation, such as sol-gel, form shell outside the PCMs to prevent flowability of liquid PCMs and provide enough mechanical properties. The chemical bridging reinforce relationship between matrix material and PCMs through molecular bridge. While the principle of microcapsules is similar to encapsulation, the difference of microcapsules is smaller particle size and SLPCMs as objects, microcapsules can reduce disadvantageous with road. In addition, polyurethane solid-solid phase change material (PUSSPCM) can regulate phase change characteristics by adjustment of chemical reaction,having better road applicability.
This review mainly summarizes the research and development trend of phase change materials for road. The paper firstly exposes the working principle of phase change asphalt pavement, and then, the optimum application formation of phase change asphalt pavement system is determined and the technical requirements of road phase change materials are put forward. Additionally, pure phase change materials (PCMs) are screened and application prospects on road are analyzed. The composite phase change materials (CPCMs) and microcapsule technology to improve the working environment of PCMs are introduced in asphalt pavement, moreover, the adaptability and application prospects on road are evaluated. Finally, the conception of composite microcapsule with phase change and self-healing is addressed, and the diversity of intelligent pavement is enriched, as well as prospects for the future development of PCMs.

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High Temperature Stability Test for Asphalt Concrete of Pavement Materials in Highway Article

WU Lingling, REN Qiliang, LUO Li

Materials Reports 2020,34(22 ):22083 -22086. DOI:10.11896/cldb.20080036

Abstract （676）

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Study on Adhesion Properties of Broken Pebble and Asphalt Based on Surface Energy Theory Article

GENG Jiuguang, LAN Qian, LIU Guangjun, ZHOU Hengyu, LIU Runxi

Materials Reports 2020,34(20 ):20034 -20039. DOI:10.11896/cldb.19070258

Abstract （522）

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Effect of Cyclic Clogging-Cleaning on Water Permeability of Porous Asphalt Mixture Article

ZHU Xuwei, LI Bo, WEI Dingbang, WEN Weijun, ZHOU Jianing

Materials Reports 2020,34(20 ):20040 -20045. DOI:10.11896/cldb.19100083

Abstract （484）

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Research Progress and Prospect of Molecular Dynamics of Asphalt Systems Article

HE Liang, LI Guannan, ZHENG Yufeng, Alessio Alexiadis, Jan Valentin, Karol J Kowalski

Materials Reports 2020,34(19 ):19083 -19093. DOI:10.11896/cldb.19070106

Abstract （1133）

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Corrosion Assessment and Prediction of Steel Bridge Deck Based on Extreme Learning Machine Article

CHEN Qian, WANG Chaohui, CHEN Yuanzhao, LI Zhenxia, GUO Tengteng, CHEN Haijun

Materials Reports 2020,34(14 ):14099 -14104. DOI:10.11896/cldb.19050091

Abstract （518）

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A State-of-the-art on Microcapsules for Asphalt Self-healing Article

HE Liang, HUANG Huduan, Wim Van den bergh, Tóth Csaba, GAO Jie, Karol Kowalski, Jan Valentin

Materials Reports 2020,34(15 ):15092 -15101. DOI:10.11896/cldb.19060096

Abstract （1369）

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Save Microcapsule technology has been applied in many fields in the world, including medicine, food and chemical industry, and has broad application prospects. Introducing the microcapsule into the self-healing of the asphalt material can improve the self-healing ability of the asphalt material, self-healing in the initial stage of the crack generation and prolong the service life of the pavement. Compared with traditional crack healing methods, microcapsule self-healing technology has the advantages of energy saving and emission reduction, reducing maintenance cost and preventing micro cracks from expanding to macro cracks.
On the other hand,the self-healing microcapsule technology of asphalt is still in the preliminary exploration stage. For the application of micron-sized microcapsules in the self-healing of asphalt materials, the required compressive strength of microcapsules remains unknown, and the theory of microcapsule rupture is immature, and there is no wide consensus on the design of microcapsule preparation process parameters and the eva-luation methods of the improvement of self-healing performance of asphalt mixture containing microcapsules(AMM).Therefore, in addition to studying the influence of the preparation process, the researchers have been trying to select the appropriate preparation process to influence the parameters and the structure and performance of the microcapsules, and have achieved fruitful results. With the continuous maturity of the preparation process and the continuous optimization of the influencing parameters, the microcapsules prepared by the in-situ polymerization method have a compact structure and excellent performance.
For the self-healing of AMM, there is no wide consensus on the evaluation methods of the improvement of self-healing performance of AMM.At present, the self-healing effect of AMM is mainly manifested by different indexes, including ductility, complex modulus, tensile strength, specimen load and crack opening displacement value, and fatigue life of asphalt mixture. The road performance of the AMM was also studied.Through diffe-rent evaluation indicators, it has better self-healing effect on asphalt mixture, the incorporation of microcapsules slightly decreases the moisture stability and high temperature stability of AMM, and decreases its low temperature crack resistance greatly to barely above the requirements.
A comprehensive review on self-healing microcapsules for asphalt materials is conducted in this research. Specifically, the preparation methods of self-healing microcapsules and the main factors affecting the quality of microcapsules (core-wall ratio, reaction temperature, end point pH value, emulsifying speed and acidizing time) are compared and analyzed. In addition, the structural characterization methods of microcapsules are presented, the evaluation method and improved self-healing performance of AMM are introduced, and the mechanical performance of AMM are elaborated, the feasibility of studying the self-healing behavior of AMM via molecular dynamics is discussed. We have confidence that the microcapsules have a bright future in the development and provide reference for the application and development of micro-scale microcapsules.

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Surface Texture of Cement Concrete Pavement: a Review Article

CONG Zhuohong, CHEN Hengda, ZHENG Nanxiang, ZHOU Wanjun

Materials Reports 2020,34(9 ):9110 -9116. DOI:10.11896/cldb.19010079

Abstract （922）

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Save China is the country with the longest miles of Portland cement concrete (PCC) pavement in the world. PCC pavement is widely applied in rural areas and tunnels of high-grade highway. The surface textures of PCC pavement in long tunnel are easy to be worn to be a mirror. So its surface friction declines rapidly to cause more traffic accidents. Surface textures of PCC pavement are the main parts to provide anti-skidding performance and make noise.
The surface textures of PCC pavement are mainly made up of macrotexture and microtexture. Macrotexture is formed by construction, which allows water to escape beneath a vehicle’s tires to prevent hydroplaning. Microtexture is the fine-scale roughness contributed by the fine aggregate in the concrete mortar to provide surface friction on sunny days. According to the construction time, the textures of PCC pavement can be classified as fresh and harden concrete. Textures for fresh concrete are done between the placement and curing of concrete. The forms include burlap dragging, transverse brooming, transverse or longitudinal tining. Transverse tining is the most common texturing technique used by state highway agencies. Textures for harden concrete are done after the formation of its strength. The forms include diamond grinding, diamond grooving and next generation concrete surface (NGCS). They are also available for restoring surface friction or lowering tire-pavement noise on existing PCC pavement. Because of aggregate and concrete strength, diamond grinding has some defects on land area. The next generation concrete surface is the most recent new concrete texture introduced in the past 20 years. It synthesizes diamond grinding and grooving techniques to make a diffe-rent texture which are more consistent and durable.
The main problems of PCC concrete are tire-pavement noise and wearing of textures. On-Board Sound Intensity (OBSI) is applied to evaluate the noise of textures. Transverse tining makes the loudest noise of all of the textures. NGCS and conventional diamond grinding (CDG) seem to be the quietest pavements. Exposed aggregate makes louder noise itself, but with combination of NGCS or CDG, it can be quiet a lot. The ASTM E274 locked-wheel skid method is used to measure friction. The loss of friction is attributed to the wearing of textures. NGCS has stable friction because of wider land area.
Transverse grooving is widely used in China. There are less researches about PCC textures on mainland. Most of them are focused on the construction parameters of transverse grooving. There are less applications for other forms of textures. For the exposed aggregate, there are more researches than applications. Diamond grinding is still confined to the research stage. It is the first time for the NGCS that is introduced to China.
This review offers the research progress of PCC textures. The types, construction parameters, application and problem were emphasized. Textures have great impact on tire-pavement noise and friction. New textures introduced by this paper could provide reference for the future application of PCC with lower noise and stable friction.

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Quantitative Analysis of Structural Changes of Asphalt Mastic with Curve-fitted of FTIR Spectrum in Salty High Temperature and High Humidity Article

ZHANG Qinling, HUANG Zhiyi

Materials Reports 2020,34(8 ):8083 -8089. DOI:10.11896/cldb.19040057

Abstract （563）

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Domestic and Foreign Research Progress of Air-entraining Agents for Low-slump of Plastic Concrete and No-slump of Dry-hard Concrete Used in Highway Concrete Article

BAI Yafei,WANG Dongmin

Materials Reports 2020,34(7 ):7099 -7106. DOI:10.11896/cldb.19030152

Abstract （534）

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Save Air entraining agent, as an admixture capable of introducing a large number of evenly distributed, closed and stable microbubbles in the mixing process of concrete mixture, has been highly concerned by researchers and peers at home and abroad since its discovery. Because on the one hand, it can effectively improve the workability, water retention and cohesiveness of concrete mixture, and improve the fluidity of concrete; on the other hand, it can greatly improve the frost resistance, salt resistance, impermeability, sulfate corrosion and alkali-resistant aggregate reaction performance of concrete, effectively reduce the thermal diffusion and conductivity of concrete, and can improve the volume stability of concrete, enhance the weather resistance of field structures, thereby prolonging the service life of highway concrete and improving durability of highway concrete. The air entraining agent is mainly used for structures with high frost resistance requirements, such as concrete dams, pavements, bridge decks, airport road surfaces and other large areas that are susceptible to freezing, and has a very broad research and application prospect.
However, today’s air entraining agents, for highway concrete, especially low-slump of plastic concrete and non-slump of dry-hard concrete, have always had difficulty in ventilating, poor foaming of introduced bubbles, poor foam stability, and air bubbles. The problems of large diameter and uneven distribution of bubbles lead to serious problems such as poor workability, frost resistance and durability of highway concrete. In recent years, the focus of research has been based on how to effectively solve the problem of air entrainment dynamometer, poor foaming of introduced bubbles, poor bubble stability, large bubble diameter, and uneven bubble distribution.
At present, research has been carried out on raw materials such as rosin resins, alkyl and alkyl arene sulfonic acids, fatty alcohol sulfonates, sapiens, etc., and in recent years, researchers at home and abroad have based on the above raw materials, from the perspective of structural design, through the effective modification of molecules and the introduction of a certain amount of special functional groups, which have made some exploration and progress on the problems of air entraining agents in highway concrete.
This paper discusses the definitions and types of air-entraining agents about low-slump of plastic concrete and no-slump of dry-hard concrete used in highway concrete and its evaluation methods from a new perspective, focusing on the domestic and foreign research progress of air-entraining agents about low-slump of plastic concrete and non-slump of dry-hard concrete used in highway concrete. And the latest research progress of air-entraining agents in highway concrete is analyzed from the new perspectives of molecular type, synthesis, design, model and so on, and a comprehensive review of the research status of low-slump of plastic concrete and non-slump of dry-hard concrete for highway concrete in terms of workability, frost resistance and durability, and two “ideal” air entraining agent molecular structure models are proposed based on our research results. It is helpful to understand the effect of air entraining agent for highway concrete on low-slump plastic and no-slump of dry-hard concrete, and better designs directly and develops a new air entraining agent used in low-slump of plastic concrete and no-slump of dry-hard concrete in highway concrete.

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