摘要
利用密度4.05~4.25 g/cm^3的铁矿石作为重骨料设计出4种3040 kg/m^3混凝土配比,喷射涂敷制备出混凝土配重海管,对混凝土配重层进行性能检验,结果表明:使用4.05~4.25 g/cm^3密度铁矿石配制出的混凝土配重层密度大于3040 kg/m^3;配重层的吸水率、抗压强度和抗冲击强度均可满足工程设计技术要求;在混凝土设计目标密度相同条件下,所用铁矿石密度在4.05~4.25 g/cm^3范围内,混凝土中铁矿石含量的变化对喷射配重层密度、抗压强度和抗冲击强度的影响较小;混凝土配重层的吸水率随混凝土配比中铁矿石含量的增大而逐渐降低。4.05~4.25 g/cm^3密度铁矿石混凝土配比的研发,完善了海管喷射配重混凝土配比体系,扩大了重骨料铁矿石的选用范围,节约了海管配重涂敷材料成本。
Four kinds of mix proportion of concrete with 3040 kg/m 3density by using 4.05~4.10 g/cm 3density iron ore as heavy aggregates are designed.The concrete weight coatings have been coated on pipes by impingement method,and the properties of concrete weight coatings are measured.The experimental results show that the density of all concrete weight coatings consisted of 4.05~4.10 g/cm^3 density iron ore aggregates is higher than 3040 kg/m^3.And water absorption,compressive strength and impact resistance of concrete coatings could meet the requirements of engineering design and international standards.When the design density of concrete which consisted of iron ore with density ranging from 4.05 g/cm^3 to 4.10 g/cm^3 for different mix proportion is the same,the variation of iron ore aggregates proportion in concrete has little effect on the density,compressive strength and impact resistance of concrete coatings produced by impingement method.The water absorption of concrete weight coatings decreases gradually with the increase of iron ore proportion in concrete.By the development of high density concrete consisted of iron ore with density 4.05~4.10 g/cm^3,the design system of concrete mix proportions has been optimized supplementarily that results in the enlargements of the optional scope of heavy aggregates and reduction of the raw material costs of concrete weight coating.
作者
武占文
周建彬
贾振
芮东
王长怀
Wu Zhan-wen;Zhou Jian-bin;Jia Zhen;Rui Dong;Wang Chang-huai(CNOOC Energy Technology&Services Zhuhai Pipe Engineering Co.,Ltd,Zhuhai 519000,China)
出处
《海洋工程装备与技术》
2019年第S01期64-68,共5页
Ocean Engineering Equipment and Technology
关键词
海管
混凝土配重
低密度铁矿石
喷射涂敷
submarine pipeline
concrete weight
low density iron ore
impingement coating
