Interaction assessment between fiber reinforcement and cement matrix containing finely ground recycled concrete

International Conference Building Materials, Products and Technologies

土木建筑工程

Trejbal, J.^1 ; ureje, J.^1 ; Hlek, R.^1 ; Proek, Z.^1,2

Czech Technical University in Prague, Faculty of Civil Engineering, Thákurova 7, Prague

166 29, Czech Republic^1

Czech Academy of Science, Institute of Physics, Cukrovarnická 10, Prague

162 00, Czech Republic^2

关键词: Adhesion enhancement;    Cement matrix;    Individual fibers;    Macro fibers;    Oxygen plasma treatments;    Polyethylene terephthalates (PET);    Recycled concretes;    Two-materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/379/1/012016/pdf
DOI  :  10.1088/1757-899X/379/1/012016

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

This work deals with adhesion enhancement between polymer macro-fibers and cement matrix (CEM I 42.5 R). Two types of fibers were used - polypropylene (PP) and polyethylene terephthalate (PET), both having approx. 0.3 mm in diameter. To achieve the increase between the two materials, fibers were surface roughened by means of an oxygen plasma treatment. Moreover, a concrete finely ground recyclate containing grains at the size of less than 0.25 mm was admixed into the cement matrix (the amount was equal to 30 wt. % of cement) to promote the required adhesion between the two materials by principle of adhesive locks. To assess the adhesion, individual fibers were pulled-out from the matrix, while a force needed to their movement was recorded. The fiber embedded length was 30 mm. It was shown, that plasma treated fibers exhibited increased adhesion with the matrix by ca. up to 20% (PP), resp. 5% (PET) than them with no surface treatment. If the concrete recyclate was used, the adhesion further increased by ca. 5-10% for both fiber types.