Papers by Keyword: Mixture Design

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Authors: Quan Lv, Ming Huang, Wei Dong Huang
Abstract: In this paper, theoretical basis and feasibility of implement of utilizing epoxy asphalt in airport pavement construction are analyzed on the purpose of choosing a satisfying material. Afterwards, we tested the high-temperature and fatigue performance of the mixture which is a major concern during airport pavement design , and the results show that the performance of the epoxy asphalt mixture is very excellent compared to conventional asphalt mixture. At the end of this paper the author put forward the problems to be solved and studied of to promote the application of epoxy asphalt mixture.
Authors: Xi Rong Wu, Nan Xiang Zhen, Zhuo Hong Cong, Guo Qing Sun
Abstract: Based on the special performance of the tunnel, a low temperature, flame-retardant and safety environmental noise reduction asphalt mixtures was developed. The result of paving the experimental road section showed that environmental protection and safety bituminous mixture compared with ordinary hot mix asphalt mixture has low temperature, fire-retardant, noise reduction characteristics. Keywords: road tunnel; viscous and environment asphalt; Mixture design; Pavement performance;test road
Authors: Yong Sheng Guan, Feng Wei An, Chao Han, Zhi Xiang Zhang
Abstract: Because of the small thickness, the mixture temperature of Ultra Thin Friction Courses (UTFC) decreased quickly during construction process, which causes the great difficulty to guarantee the pavement compaction, especially for the dense gradation asphalt mixture. In order to solve this problem, Polyolefin and SBS modified asphalt (Abbrev. PSA) mixture was designed. Volumetric properties, compaction characteristics, water sensitivity, as well as high/low temperature performance of the mixture were investigated. Laboratory test results show the PSA mixture has very good high temperature performance and other beneficial characteristics. Field tests show that the new asphalt mixture possesses very good pavement performance, as well as easily to be constructed. The PSA mixture can be used as preventive maintenance and repair materials.
Authors: Kuang Huai Wu, Guo Liang Yang, Ai Yu Zeng
Abstract: In order to find a convenient approach to design the mix of rubberized asphalt concrete (RAC) and make full use of the properties of RAC, a kind of RAC-13 (13 is the nominal maximum aggregate size of the mixture) was designed by means of coarse aggregate void filling method (CAVF). A series of conventional tests of asphalt mixture with five asphalt-rubber aggregate ratio(ARAR) were carried out to check the target mix design and evaluate the performance of RAC. Performance evaluation tests such as Marshall and submerged Marshall stability test, moisture damage test and wheel tracking test were included. Test results show that the high temperature stability, moisture susceptibility and road performance of RAC-13 designed with CAVF method are all favorable. The recommended optimum asphalt-rubber aggregate ratio(OARAR) is 7.1% under the condition of skeleton structure. CAVF is a good means for designing RAC to ensure its stone-on-stone contact structure.
Authors: Qin Qin Liu, Zi Mao Peng, Meng Jie Lin
Abstract: Firstly, based on contrast to the the merits of conventional asphalt, natural colored asphalt, bitumen thermoset and thermoplastic light colored asphalt, the paper proposed the base asphalt selection method. Then on the basis of comparison of the performance of organic pigments and inorganic pigments of paint, the pigmentselection method was identified. Thirdly, the paper compared the color characteristics of different types of stone and provided some recommendations on aggregate selection. Finally, the paper briefly introduced the design method and technical requirement of colored hot-mix asphalt material.
Authors: Wassanai Wattanutchariya, Atitaya Oonjai, Kittiya Thunsiri
Abstract: This study reports the effects of the mixing ratio of hydroxyapatite (HA), silk fibroin (SF) and chitosan (CS) on the physical properties of the scaffold used in tissue engineering. Experimental design based on mixture design was implemented to investigate the degradation rate of the scaffolds fabricated from various ratios of those biomaterials. Furthermore, pore morphology and pore size were evaluated to confirm the compatibility of the scaffold topography for cell growth and adhesion. The results from the study showed that all ratios, except pure HA solution, can be fabricated into porous scaffolds with an interconnected pore structure and appropriate pore sizes to allow all types of human cells to pass through. Furthermore, the scaffold solutions with high CS ratio resulted in a uniform pore structure and lower rates of biodegradation. Therefore, CS is recommended as the main structure because it provides the highest resistance to biodegradation. The scaffolds from various ratios may be applied for different tissue replacements in the near future.
Authors: Chang Hong Zhou, Shao Hua Liu, Qiang Yuan
Abstract: In order to reduce the cost of Porous asphalt concrete and the effective use cheap limestone widely distributed in local, the gradation design works of limestone-typed PAC is presented in this paper. Considering convenience of building and testing for local enterprises, Marshall Design Method, still used in local standards, is adopt. Limestone usually shows low strength and easy break, which obviously affect the performance of mixture. Therefore, Forming temperature and beat numbers of Marshall Test is researched. The results show that: a) Regular aggregate, whose shape is similar to a cube, with low flat ratio and low crushing value is important for improving the performance of limestone-typed PAC. b) Forming temperature and Beat number is suggested taking 155°C and 35 times. c) The standard of limestone-typed PAC should not be as same as basalt-typed. The indices can be suitably lessened according to the actual conditions of aggregates.
Authors: Magdaléna Doleželová, Jitka Krejsová, Alena Vimmrová
Abstract: The influence of different types of fine aggregates on behavior and properties of gypsum mortars was investigated. The design procedure and results of some basic physical tests are described. The composition of mixtures was designed in order to minimalize all other impacts than type of aggregate. Four types of fine aggregates of different origin, with different shape and surface of particles were used. The presence of fine aggregate in gypsum increases the bulk density and reduces setting time. Crushed stone with angular rough particles worsen workability and reduce setting time more significantly than aggregates with round and smooth particles.
Authors: J.V. Nardi, Dachamir Hotza
Abstract: Preliminary results of the use of electroomosis technique for removal of organic contaminants in ceramic filtration porous structure are presented. The method employed provokes the migration of chemical residue and waste retained or adsorbed on the pore surfaces by applying a controlled tension within an electrochemical system. Porous ceramics have been the most common filtration medium employed within a broad range of applications. Conventional cleaning of a ceramic medium is not entirely effective for organic contaminants since they cannot be excluded by size, but retained through chemical affinity to the oxide surface. Under the influence of an electrical current, adsorbed molecules underwent shear stress due to the diffuse moving layer. In their ionic state the specimens are dragged and thus move towards the opposite charged electrode. Phenol was chosen as a standard contaminant and tests carried out using commercial ceramic filtration candles. Relative contaminant concentration was assessed by optical densities (UV-Vis spectroscopy). The results show that removal is proportional for up to 58% of the contaminant in diluted condition.
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