For overcoming disadvantages of wood, an esterification process was employed and tetrabromophthalic anhydride (TBPA) was used as a reactive chemical agent to prepare an esterified wood with the high dimensional stabil...For overcoming disadvantages of wood, an esterification process was employed and tetrabromophthalic anhydride (TBPA) was used as a reactive chemical agent to prepare an esterified wood with the high dimensional stability, flame resistance, and resistance to biodegradation from water-leaching. The experimental results indicated that esterification of wood plus maleic anhydride / tetrabromophthalic anhydride / glycerol could endow wood with dimensional stability, the antiswelling efficiency during water absorption (ASEw), reduction in water absorptivity (RWA), antiswelling efficiency during moisture absorption (ASEm), moisture excluding efficiency (MEE), and oxygen index (OI) of treated wood increased with an increase in the weight percent gain (WPG). And the treated wood showed great decay resistance and resistance to water leaching, too.展开更多
In recent years, with the rapid development of China's economy and the acceleration of the urbanization process, the demand for infrastructure construction has become higher and higher, thus ensuring the sustainab...In recent years, with the rapid development of China's economy and the acceleration of the urbanization process, the demand for infrastructure construction has become higher and higher, thus ensuring the sustainable development of the national economy and the circulation of commodities. Therefore, the construction quality of soft foundation is an important factor affecting the quality of highway bridge engineering in our country. Soft foundation is an important potential safety hazard in highway and bridge construction. Its water content is above 70%, and it has low foundation bearing capacity, permeability, compressibility, viscosity and other characteristics. If not paid attention to in the construction process, it will not only affect the overall use effect of the project, but also cause uneven settlement, instability, collapse and other problems, causing serious consequences. Therefore, it is necessary to adopt appropriate technical measures in highway, bridge and other projects. Therefore, in highway bridge construction, technical personnel should strengthen the control of the soft soil foundation in time, understand the influence of the current soft soil foundation on the bridge structure from the perspective of soft soil foundation treatment, fully understand the engineering requirements, and master the technical key points of construction at the same time, improve the construction treatment technology of the soft soil foundation of the road bridge, and guarantee the construction quality. In order to further improve the quality of highway and bridge construction, the feasibility analysis scheme of soft foundation reinforcement technology is formulated. Based on the characteristics of soft foundation and the problems in construction technology, this paper discusses its specific application.展开更多
文摘For overcoming disadvantages of wood, an esterification process was employed and tetrabromophthalic anhydride (TBPA) was used as a reactive chemical agent to prepare an esterified wood with the high dimensional stability, flame resistance, and resistance to biodegradation from water-leaching. The experimental results indicated that esterification of wood plus maleic anhydride / tetrabromophthalic anhydride / glycerol could endow wood with dimensional stability, the antiswelling efficiency during water absorption (ASEw), reduction in water absorptivity (RWA), antiswelling efficiency during moisture absorption (ASEm), moisture excluding efficiency (MEE), and oxygen index (OI) of treated wood increased with an increase in the weight percent gain (WPG). And the treated wood showed great decay resistance and resistance to water leaching, too.
文摘In recent years, with the rapid development of China's economy and the acceleration of the urbanization process, the demand for infrastructure construction has become higher and higher, thus ensuring the sustainable development of the national economy and the circulation of commodities. Therefore, the construction quality of soft foundation is an important factor affecting the quality of highway bridge engineering in our country. Soft foundation is an important potential safety hazard in highway and bridge construction. Its water content is above 70%, and it has low foundation bearing capacity, permeability, compressibility, viscosity and other characteristics. If not paid attention to in the construction process, it will not only affect the overall use effect of the project, but also cause uneven settlement, instability, collapse and other problems, causing serious consequences. Therefore, it is necessary to adopt appropriate technical measures in highway, bridge and other projects. Therefore, in highway bridge construction, technical personnel should strengthen the control of the soft soil foundation in time, understand the influence of the current soft soil foundation on the bridge structure from the perspective of soft soil foundation treatment, fully understand the engineering requirements, and master the technical key points of construction at the same time, improve the construction treatment technology of the soft soil foundation of the road bridge, and guarantee the construction quality. In order to further improve the quality of highway and bridge construction, the feasibility analysis scheme of soft foundation reinforcement technology is formulated. Based on the characteristics of soft foundation and the problems in construction technology, this paper discusses its specific application.
