CONCRETES SELF-HEALING POTENTIALS FOR PROMOTING DURABILITY; NUMERICAL EVALUATION OF CONTRIBUTIONS FROM UNHYDRATED CEMENT
Transport of harmful substances through the pore space of concrete can give rise todeterioration of concrete structure or to corrosion of steel reinforcement. Internal and externalinfluences,e.g. shrinkage and freeze-thawing,will additionally lead to the formation ofmyriads of tiny cracks in the virgin state. These cracks can have detrimental impact onconcrete durability. Cement particle nuclei left unhydrated in concrete after completematuration can provide under favorable conditions self-healing capability to micro-crackedconcrete. Basically,the self-healing capability can be expected depending on the amount ofunhydrated cement,however,also on the number and spacing of the nuclei of unhydratedparticles. This is obviously a configuration-sensitive material problem for which commonRSA-based computer simulation systems cannot provide reliable estimates. Therefore,theconcurrent algorithm-based computer simulation system with the acronym SPACE has beenemployed. The impact of principal design parameters of concrete (cement fineness,water tocement ratio) on maximum healable micro-crack opening is emphasized.
self-healing unhydrated cement bulk concrete fineness of cement water to cement ratio maximum healable crack opening
H. He P. Stroeven Z. Guo M. Stroeven
Faculty of Civil Engineering and Geosciences,Delft University of Technology,The Netherlands
国际会议
The International Conference on Durability of Concrete Structures(2008年混凝土结构耐久性国际学术会议)
杭州
英文
412-418
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）