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利用普通硅酸盐水泥、二级优质粉煤灰和GHPC海洋耐蚀掺合料三元复合胶料作胶料,破碎的礁石作粗集料代替石子,礁砂作细集料代替大陆河砂,配制了礁砂高性能海洋混凝土。对三元复合胶料礁砂混凝土的物理力学性能开展了试验研究,并对其高性能化的机理进行了分析与探讨。利用现有材料和技术,通过对岛礁原料进行新的组合,可以使礁砂混凝土高性能化,配制出C30~C50的大流动、免震捣、自密实、耐腐蚀、寿命长的高性能海洋礁砂混凝土。 相似文献
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Optimization for vehicle scheduling in iron and steel works based on semi-trailer swap transport 总被引:1,自引:0,他引:1
In order to solve internal logistics problems of iron and steel works, such as low transportation efficiency of vehicles and
high transportation cost, the production process and traditional transportation style of iron and steel works were introduced.
The internal transport tasks of iron and steel works were grouped based on cluster analysis according to demand time of the
transportation. An improved vehicle scheduling model of semi-trailer swap transport among loading nodes and unloading nodes
in one task group was set up. The algorithm was designed to solve the vehicle routing problem with simultaneous pick-up and
delivery (VRPSPD) problem based on semi-trailer swap transport. A solving program was written by MATLAB software and the method
to figure out the optimal path of each grouping was obtained. The dropping and pulling transportation plan of the tractor
was designed. And an example of semi-trailer swap transport in iron and steel works was given. The results indicate that semi-trailer
swap transport can decrease the numbers of vehicles and drivers by 54.5% and 88.6% respectively compared with decentralized
scheduling in iron and steel works, and the total distance traveled reduces by 43.5%. The semi-trailer swap transport can
help the iron and steel works develop the production in intension. 相似文献
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