避免钢筋混凝土短柱破坏的构造措施及其探讨

钢筋混凝土框架结构中的短柱,影响了房屋的抗震性能和工程质量。其破坏状态为脆性,在新建钢筋混凝土房屋的抗震设计和现有钢筋混凝土房屋的抗震加固中应尽量避免;在施工中应杜绝不符合设计思想而形成的短柱,只有这样才能从根本上提高钢筋混凝土房屋的抗震性能和工程质量。

STATE-OF-ART ON CORROSION AND PREVENTION OF REINFORCED CONCRETE

The corrosion causes of rebar in concrete under corrosive environment are analyzed and discussed. It is mainly suffered from the penetration of corrosive species from environment in to the surface of rebar. Corrosion is initiated by penetration of chlorides and breakdown of passivation, and then propagated by crack of concrete induced by st ress from volume expansion of corrosion product of rebar in succession. Some eff ective countermeasures for corrosion prevention for reinforced concrete are brie fly specified and discussed. Finally, some important techniques commonly used or to be developed are also suggested.

亚硝酸钙水泥外加剂应用价值高

亚硝酸钙水泥外加剂是在砂浆或混凝土搅拌中或拌和前掺入的阻锈剂。它能按要求改变和提高混凝土的性能,

神奇的混凝土外加剂

所谓混凝土外加剂,是指在拌制混凝土过程中掺入的,掺量不大于水泥重量的5％,用于改善混凝土普通性能的一类物质。混凝土外加剂的种类很多,现已成为混凝土中少不了的第五组分(其它组分为水泥、砂、石、水)。 常用的混凝土外加剂有; 1、早强剂。早强荆是能显著提高混凝土早期强度。