高强度混凝土的研究现状

高强度混凝土的研究现状

高强混凝土为采用水泥、砂、石、高效减水剂等外加剂和粉煤灰超细矿渣硅灰等矿物掺合料以常规工艺配制,使新拌混凝土拥有良好的和易性,硬化后强度等级为C60及其以上的混凝土。高强混凝土对承受压力的构件有显著的技术经济效益,它不仅减少构件截面,减少混凝土的用量,还能降低成本。在高层建筑中,由于高强混凝土的高强、早强和变形模量,可以缩减低层梁、柱的截面并增加建筑使用面积,扩大建筑的柱网间距并改善建筑使用功能,可以增加结构刚度而减少高层房屋的压缩量与水平荷载的横向位移。

高强度混凝土致密、抗渗和抗冻性均高于普通混凝土,因此在有腐蚀的环境、易遭破损的结构、尤其基础设施工程,多采用高强混凝土结构。高强混凝土变形小,从而使构件的刚度得以提高,大大改善了建筑物的变形性能。在大跨屋盖。大跨屋盖的自重要占到全部设计荷载中的绝大部分,所以采用高强混凝土空间结构或预应力结构就变得十分有利,可以显著降低结构的重量。与传统的混凝土相比,高强混凝土在原材料的配比上主要有二点不同,即低水灰比和多组分,其目的都是为了增加混凝土的密实程度,改善骨料和硬化水泥浆之间的界面性能,从而达到高强和耐久。

The current research status of high strength concrete

High strength concrete used for cement, sand, stone and superplasticizer and admixture of fly ash and slag ultrafine silicon ash to wait mineral admixtures with conventional process configuration, make new mix concrete has good workability, strength level after sclerosis for C60 concrete and above. High strength concrete to the pressure of a significant component of the technical and economic benefits, it not only reduce the component section,

reduce the dosage of the concrete, still can reduce the cost. In the high-rise building, the high strength, high strength concrete of the early strength and deformation modulus, can cut low-level beams and columns of the section and increase use area of building, expanding the column grid spacing and improve building construction use function, can increase the structure stiffness and reduce the compression and tall buildings horizontal load transverse displacement.

High strength concrete density, anti-permeability and freeze resistance are higher than the ordinary concrete, so in the corrosion of the environment, easy to have the structure, especially by the damaged infrastructure project, use the high strength concrete structure. High strength concrete little deformation, and the stiffness of the components can be increased, has greatly improved the building deformation property. In the big span roof. Big span roof since all of the important account for most of the design load, and use high strength concrete space structure or prestressed structure will become very favorable, can significantly reduce the weight of the structure. Compared with the traditional concrete, high strength concrete in the ratio of raw materials mainly two different points, including the low water-cement ratio and many components, the purpose is to increase the degree of concrete close-grained, improve the aggregate and hardened slurry the interface between the performance, so as to achieve the high strength and durability.

The current research status of high strength concrete

High strength concrete used for cement, sand, stone and superplasticizer and admixture of fly ash and slag ultrafine silicon ash to wait mineral admixtures with conventional process configuration, make new mix concrete has good workability, strength level after sclerosis for C60 concrete and above. High strength concrete to the pressure of a significant component of the technical and economic benefits, it not only reduce the component section, reduce the dosage of the concrete, still can reduce the cost. In the high-rise building, the high strength, high strength concrete of the early strength and deformation modulus, can cut low-level beams and columns of the section and increase use area of building, expanding the column grid spacing and improve building construction use function, can increase the structure stiffness and reduce the compression and tall buildings horizontal load transverse displacement.

High strength concrete density, anti-permeability and freeze resistance are higher than the ordinary concrete, so in the corrosion of the environment, easy to have the structure, especially by the damaged infrastructure project, use the high strength concrete structure. High strength concrete little deformation, and the stiffness of the components can be increased, has greatly improved the building deformation property. In the big span roof. Big span roof since all of the important account for most of the design load, and use high strength concrete space structure or prestressed structure will become very favorable, can significantly reduce the weight of the structure. Compared with the traditional concrete, high strength concrete in the ratio of raw materials mainly two different points, including the low water-cement

ratio and many components, the purpose is to increase the degree of concrete close-grained, improve the aggregate and hardened slurry the interface between the performance, so as to achieve the high strength and durability.