報(bào)告題目：Resilience of reinforced concrete structures in corrosive conditions （腐蝕環(huán)境下鋼筋混凝土的韌性研究）

報(bào)告人：Robert E. Melchers

報(bào)告時(shí)間：10月21日（星期二）10:00 - 12:00

報(bào)告地點(diǎn)：西華大學(xué)5A427會(huì)議室

主辦單位：材料科學(xué)與工程學(xué)院

報(bào)告人簡(jiǎn)介：

Robert E. Melchers, Professor of Civil Engineering (Emeritus), The University of Newcastle, Australia, BE, MEngSC (Monash), PhD (Cambridge, UK), Fellow, Australian Academy of Technology and Engineering. Honorary Fellow, The Institution of Engineers Australia. Awards include 2009 ACA Corrosion Medal, 2012 Jin S Chung Award (ISOPE), 2013 John Connell Gold Medal (The Institution of Engineers, Australia), 2014 Eminent Speaker, Structural College, The Institution of Engineers, Australia, 2006 and 2018 Guy Bengough Award (IOM3).

Robert E. Melchers，澳大利亞紐卡斯?fàn)柎髮W(xué)土木工程學(xué)院榮譽(yù)教授。先后獲莫納什大學(xué)工學(xué)學(xué)士、工程科學(xué)碩士及英國(guó)劍橋大學(xué)博士學(xué)位，澳大利亞技術(shù)與工程院院士、澳大利亞工程師協(xié)會(huì)榮譽(yù)會(huì)士。曾榮膺2009年度澳大拉西亞腐蝕協(xié)會(huì)腐蝕獎(jiǎng)?wù)隆?/span>2012年國(guó)際海洋與極地工程學(xué)會(huì)(ISOPE) Jin S. Chung獎(jiǎng)、2013年澳大利亞工程師協(xié)會(huì)的最高獎(jiǎng)John Connell Medal、2014年澳大利亞工程師協(xié)會(huì)結(jié)構(gòu)學(xué)院杰出演講人稱(chēng)號(hào)，并于2006年及2018年兩度獲英國(guó)材料、礦物與采礦學(xué)會(huì)(IOM3) Guy Bengough獎(jiǎng)。

報(bào)告內(nèi)容簡(jiǎn)介：

This presentation reviews why reinforced concrete structures, properly made, can endure very aggressive conditions for very long periods of time without reinforcement corrosion or concrete deterioration. Field evidence for this has been available for many years. Laboratory experiments do not always properly represent the behaviour of actual concrete structures. Chlorides are of little importance early in the exposure period. High quality well-compacted, low-permeability concretes eventually deteriorate through the slow outward leaching of concrete alkalis mainly Ca(OH)₂. Its loss is accelerated when chlorides are present. Also reviewed is recent experience with so-called 'carbonation' of concrete. Usually, this is assumed to cause reinforcement corrosion. It is shown that in this case, too, the critical mechanism is the slow loss of Ca(OH)2 by outward leaching. The calcium carbonate layer (carbonation') on the external surface tends to act as a diffusion barrier for such leaching. In addition to these two mechanisms, increasing evidence suggests that reinforcement corrosion may be the result of alkaline-silicate reactivity (ASR) or alkaline-aggregate reactivity (AAR) of the aggregates in the concrete. These break-down of protection of the concrete through break-down and expansion of aggregates.