The durability characteristics of high performance concrete:: a review
The durability characteristics of high performance concrete:: a review
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DOI：
10.1016/s0958-9465(02)00081-1
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发表时间：
2003-05-01
影响因子：
10.5
通讯作者：
Aïtcin, PC
中科院分区：
文献类型：
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作者：
Aïtcin, PC
普通混凝土的耐久性问题可能与环境的严重性和使用不适当的高水/粘合剂比有关。水胶比在0.30和0.40之间的高性能混凝土通常比普通混凝土更耐用，不仅因为它们的多孔性更小，而且因为它们的毛细和孔隙网络由于自干性的发展而在某种程度上断开。在高性能混凝土（HPC）中，侵蚀剂的渗透相当困难，而且只是表面的。然而，如果在水化反应发展的早期阶段不加以控制，自干性是非常有害的，因此，高性能混凝土的养护必须与普通混凝土有很大的不同。北海和加拿大的现场经验表明，经过适当设计和固化的高性能混凝土，在非常恶劣的环境下也能发挥令人满意的作用。然而，高性能混凝土的耐火性能虽然不如普通混凝土，但也不像一些悲观报道中有时写的那样差。与其他建筑材料相比，混凝土，无论其类型，从防火的角度来看，仍然是一种安全的材料。(C) 2002 Elsevier Science Ltd.版权所有。
Durability problems of ordinary concrete can be associated with the severity of the environment and the use of inappropriate high water/binder ratios. High-performance concrete that have a water/binder ratio between 0.30 and 0.40 are usually more durable than ordinary concrete not only because they are less porous, but also because their capillary and pore networks are somewhat disconnected due to the development of self-desiccation. In high-performance concrete (HPC), the penetration of aggressive agents is quite difficult and only superficial. However, self-desiccation can be very harmful if it is not controlled during the early phase of the development of hydration reaction, therefore, HPC must be cured quite differently from ordinary concrete. Field experience in the North Sea and in Canada has shown that HPCs, when they are properly designed and cured, perform satisfactorily in very harsh environments. However, the fire resistance of HPC is not as good as that of ordinary concrete but not as bad as is sometimes written in a few pessimistic reports. Concrete, whatever its type, remains a safe material, from a fire resistance point of view, when compared to other building materials. (C) 2002 Elsevier Science Ltd. All rights reserved.