The use of lithium compounds for inhibiting alkali-aggregate reaction effects in pavement structures

Resilient and Safe Road Infrastructure

土木建筑工程

Zapala-Slaweta, J.^1 ; Owsiak, Z.^1

Kielce University of Technology, Al. Tysiclecia Pastwa Polskiego 7, Kielce

25-314, Poland^1

关键词: Alkali-aggregate reactions;    Alkali-silica reaction;    Corrosion of concretes;    Durability of concretes;    Impregnation methods;    Pavement structures;    Reactive aggregate;    Transportation infrastructures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/356/1/012008/pdf
DOI  :  10.1088/1757-899X/356/1/012008

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Internal corrosion of concrete caused by the reaction of reactive aggregate with sodium and potassium hydroxides from cement is a threat to the durability of concrete pavements. Traditional methods for reducing the negative effects of the reaction include the use of unreactive aggregates, low alkali cements, mineral additives or chemical admixtures, incorporated during mixing. Lowering the relative humidity of the concrete below 80% is another measure for limiting the destructive reaction. The incorporation of lithium compounds, in particular lithium nitrate and lithium hydroxide, to the concrete mix is a method of limiting alkali-silica reaction effects. The challenge is to reduce the negative effects of aggregate reactivity in members in which the reaction has occurred because the aggregate happened to be reactive. The paper presents ways of limiting the deterioration of ASR-affected concrete in road pavements and other forms of transportation infrastructure, mainly through the use of lithium compounds, i.e. lithium nitrate. Impregnation methods that allow the penetration of lithium ions into the concrete structure were characterized, as was the effectiveness of the solutions applied.