Advanced Materials Research Vols. 374-377

Abstract: Discarded tires used as reinforced materials have distinctive merits, such as high tensile strength, good anti-friction, fine flexility and durability, which can be used in reinforced wall, embankment and slope etc. some successful applications of discarded tire in reinforced slope are introduced, which have not only obtained significant economic benefits, but also resulted in good social and ecological benefits. The environment stress resulted from the world black pollution of discarded tires may be relieved through these new geotechnical applications. Different reinforced pattern of discarded tires are compared. The result has shown that discarded tire used for reinforcement is a particularly useful method. The settlement need to be given attention during reinforced engineering. Clay soil is averted as reinforcement with discarded tires. The tire with inside wall removed and backfilled with sandy soil is a good reinforced pattern.

Abstract: Ceramisite concrete was charateristic of size effect as common concret. Through the experimentation of size effect on cubic compressive strength and axial compressive strength,and analysed and research coefficient of size effect by classical theoretics,elicit size effect of ceramisite concrete.

Abstract: The mathematical analysis model of LCC of self-thermal insulation system of external wall that is applicable to Changsha region is established by using degree days and present worth factor. And the LCC of three commonly used self-thermal insulation systems in Changsha is analyzed by using this model. Analysis results have proven that self-thermal insulation system of external wall has very significant comprehensive economic benefits compared with the wall that energy-saving measures are not taken, and it has an important practical significance to promote the development of energy-saving building in Changsha, China．

Abstract: Monuments are precious historical and cultural heritages, they are non-renewable cultural resources, the authenticity of monuments lies in the value of cultural relics, protecting the monument’s historical value and reflecting the complete history characteristics in particular historical period are the restoration principles of monuments. This paper proposed the attentions of applied chemicals in the restoration of monuments by introducing the application of chemicals in monument’s anti-corrosion treatment of wooden components, reinforcement of wooden components, protection of masonry as well as masonry reinforcement etc. Chemicals can effectively protect the unique historical, scientific and artistic value of monuments, chemicals and chemical technology will have broad application prospects in the field of monument restoration technology.

Abstract: This paper studies on the relative denseness of fresh cement pastes compounded with multi-cementitious materials and the performances of their harden concretes. Results show that with the dense packing of several ultra-fine particles, higher the relative denseness of different cementitious material system, higher the compressive strength and lower the air permeability of the harden concrete. The multi-cementitious material compounded by 37% cement、20% fly ash、40% pulverized slag and 3% silica fume has the higher relative denseness of fresh cement paste, and its compressive strength and air permeation of harden concrete composite is also improved.

Abstract: The Work made use of two different asphalts-Shengli and Kalamayi and two different aggregates-Granite and Lime-stone to study the performance of asphalt mixtures under high temperature and moisture condition. Two modifers AST-3 and hydrated lime were investigated as prospective performance enhancers. Film stripping and marshall’s Retained stability tests were used to determined the adhesion characteristics and Moisture susceptibility of mixture, immersion wheel tracking test was used to study the rutting potential at high temperature in the presence of moisture.

Abstract: Bamboo fiber concrete is a type of architectural material. Because of its fast growth and environmental protection, bamboo fiber concrete attracts much attention from researchers and industries. However, research on bamboo fiber concrete is not enough which greatly affects its applications in engineering. Based on the splitting tensile test of bamboo fiber concrete, the formulas of splitting tensile strength are presented using composite material theory and fiber spacing theory respectively. A comparison of the theoretical values of splitting tensile strength with those of test is made. It is found that the formula deduced from composite material theory leads to severe errors because of its unrealistic hypothesis. Therefore the composite material theory is inappropriate to explain the strengthening mechanism of bamboo fiber concrete. On the other hand, fiber spacing theory not only has higher accuracy but also reflects the effect of fiber content and length-radius-ratio on the splitting tensile strength of concrete. So the fiber spacing theory is adapted to study the strengthening mechanism of bamboo fiber to concrete.

Abstract: Hydrated lime, as additive agent, was applied into asphalt mix to improve water stability. In this paper, asphalt retention ratio (According Schellenberg Leaking Test) and volume properties of asphalt mix containing hydrated lime, cement and conventional limestone mineral powder were comparatively investigated. The effect of hydrated lime on mastic asphalt was estimated using Dynamic Sheer Rheometer (DSR). The test results indicated that the asphalt retention ratio containing hydrated lime is superior to those of cement and mineral powder. At the same temperature, the viscosity and G*/sinδ of mastic asphalt containing hydrated lime increased apparently. To integrate the volume characteristics, asphalt retention ratio and mastic asphalt, the anti-stripping procedure of aggregate pre-damping using hydrated lime has been recommended.

Abstract: Properties of plain concrete and polyacrylonitrile fiber concrete, including fatigue resistance performance，flexural toughness and impact resistance performance were respectively studied．Improved effect on airport pavement classification number(PCN)by the addition of polyacrylonitrile fiber in concrete was then analyzed．Experiment results showed that all property indexes of concrete increased greatly，and pavement classification number also was enhanced by the percentage of 8.4．In this way，load-carrying capacity of airport pavement was enhanced greatly．

Abstract: Fair-faced light weight aggregate (FLWA) concrete is of all good performance of both LWA and fair-faced concrete. There is a fluorocarbon coating on its surface. This paper studies on how this paint influences FLWA durability.