An experimental clarification of the association of delayed ettringite formation with alkali-aggregate reaction
An experimental clarification of the association of delayed ettringite formation with alkali-aggregate reaction
复制标题
延迟钙矾石形成与碱骨料反应关联的实验澄清
DOI：
10.1016/0958-9465(96)00012-1
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发表时间：
1996
影响因子：
10.5
通讯作者：
I. Ivanusec
中科院分区：
文献类型：
--
作者：
A. Shayan;I. Ivanusec
确定混凝土构件在延迟钙矾石形成（DEF）和碱-骨料反应（AAR）的组合存在下损坏的主要原因的问题是非常有争议的。一些作者认为，DEF已在高温下固化的混凝土元件的严重损坏（开裂）的原因，和其他一些属性的损害AAR，与DEF的一个小角色。为了帮助澄清这个问题，实验砂浆标本设计，其中任何这些化学过程可以单独或组合发生。使试样经受在40 °C下连续固化或在75 °C下初始蒸汽固化8小时，随后在40 °C、100%RH下储存。对这些标本的长度变化测量结果有利于AAR是损坏的主要原因的结论，但在某些条件下DEF可能有助于it. However，在AAR开裂的情况下，没有DEF被观察到在这里检查的系统，强调的主要作用的AAR在造成损害的形式在混凝土开裂。
The issue of determining the primary cause of damage to concrete elements in the presence of a combination of delayed ettringite formation (DEF) and alkali-aggregate reaction (AAR) is very controversial. Some authors believe that DEF has been the cause of serious damage (cracking) to concrete elements cured at elevated temperatures, and some others attribute the damage to AAR, with a minor role for DEF. To assist in clarifying the issue, experimental mortar specimens were devised in which either of these chemical processes could occur separately or in combination. The specimens were subjected to either continuous curing at 40 °C or initial steam curing at 75 °C for 8 h followed by storage at 40 °C, 100% RH. The results of length change measurements on these specimens favour the conclusion that AAR is the primary cause of damage, but under certain conditions DEF may contribute to it. However, in the absence of AAR cracking no DEF was observed in the systems examined here, emphasising the primary role of the AAR in causing damage in the form of cracking in concrete.