COMPUTER MODELING OF BRIDGE DECK CRACKING

摘要：

High performance concrete (HPC) is expected to greatly enhance concrete structuredurability and service life in harsh environments. However,these durability benefits are mostoften unrealized in bridge decks due to the predominance of transverse cracking thatundermines the ability of the HPC to protect the embedded reinforcing steel from chlorideinduced corrosion. Several studies have actually pointed to the HPC as the culprit inexacerbating this propensity for transverse cracking in bridge decks,which is strongly relatedto its high early age shrinkage. This paper presents our findings of bridge deck cracking risks using a 2-D finite elementcomputer modeling for a typical bridge deck. It is found that,the usage of shrinkage-reducingadmixtures (SRA) in deck concrete mixtures is highly effective in reducing cracking risks.The combined use of SRA and an expansive agent further reduces deck cracking propensity.In addition to modeling work,a laboratory study on the effect of the SRA and an expansiveagent on concrete cracking tendency is also presented.

关键词： bridge deck cracking shrinkage SRA expansive agent modelling

作者: Lianfang Li Neal S. Berke Timothy A. Durning

作者单位: Grace Construction Products,USA

会议类型: 国际会议

会议名称: The International Conference on Durability of Concrete Structures(2008年混凝土结构耐久性国际学术会议)

会议地点: 杭州

会议语种:英文

页码: 790-795

在线出版日期: 2008-11-01（万方平台首次上网日期，不代表论文的发表时间）