The construction controlling elements,including construction performance at low ambient temperatures,reserved time ranges,and the strength increasing rule,for locally developed epoxy asphalt mixture（LDEAM） are studi...The construction controlling elements,including construction performance at low ambient temperatures,reserved time ranges,and the strength increasing rule,for locally developed epoxy asphalt mixture（LDEAM） are studied through laboratory tests.Air void and Marshall stability are chosen as the performance measures for evaluating the construction quality.The wheel rolling test is used to simulate the actual construction situations,while the Marshall test and the Brookfield viscosity test are adopted to study the strength increasing rule.The experimental results reveal that the LDEAM can be constructed under a low ambient temperature condition of 10℃,and its longest reserved time is 70 min at a reserved temperature of 120℃.Test also shows that the strength of the LDEAM increases with time and temperature before cured.Finally,the theoretical reason for the strength increasing rule is analyzed on the basis of the organic chemistry theory.展开更多
If a local structural region in the vessel is subjected to the external loads, its strength shall be evaluated. After analysis, it is shown in this paper that the strength evaluation conditions for local stresses shal...If a local structural region in the vessel is subjected to the external loads, its strength shall be evaluated. After analysis, it is shown in this paper that the strength evaluation conditions for local stresses shall be determined in accordance to the nature of loads and the category of stresses. Moreover, it is explained by an example in this paper that the flexibility of the joint between the nozzle and the vessel has a big influence on the load values in the joint and the maximum bending moment values in the pipe connected to the joint as the stress analysis of the piping system is carried out in order to determine the loads exerted on the vessel. Therefore, a consideration of the flexibility of the joints in the design is significant for improving safety and economy of the design.展开更多
基金The National Natural Science Foundation of China (No.50578038)the National Key Technology R& D Program of China during the 11th Five-Year Plan Period (No. 2009BAG15B03)
文摘The construction controlling elements,including construction performance at low ambient temperatures,reserved time ranges,and the strength increasing rule,for locally developed epoxy asphalt mixture（LDEAM） are studied through laboratory tests.Air void and Marshall stability are chosen as the performance measures for evaluating the construction quality.The wheel rolling test is used to simulate the actual construction situations,while the Marshall test and the Brookfield viscosity test are adopted to study the strength increasing rule.The experimental results reveal that the LDEAM can be constructed under a low ambient temperature condition of 10℃,and its longest reserved time is 70 min at a reserved temperature of 120℃.Test also shows that the strength of the LDEAM increases with time and temperature before cured.Finally,the theoretical reason for the strength increasing rule is analyzed on the basis of the organic chemistry theory.
文摘If a local structural region in the vessel is subjected to the external loads, its strength shall be evaluated. After analysis, it is shown in this paper that the strength evaluation conditions for local stresses shall be determined in accordance to the nature of loads and the category of stresses. Moreover, it is explained by an example in this paper that the flexibility of the joint between the nozzle and the vessel has a big influence on the load values in the joint and the maximum bending moment values in the pipe connected to the joint as the stress analysis of the piping system is carried out in order to determine the loads exerted on the vessel. Therefore, a consideration of the flexibility of the joints in the design is significant for improving safety and economy of the design.
