MECHANIC CHARACTERISTICS OF POLYPROPYLENE FIBER CONCRETE
This paper elaborated the influnce of polypropylene fiber reinforced concrete by three stages. They involve: the fresh stage of concrete and the early period of hydration, the hardened period and the service period of materials. At the first stage, after adding the polypropylene fiber into concrete, the slump loss of concrete and bleeding ratio decrease; the polypropylene fiber incorporate into concrete as a aggregate, the interface zone between mortar and fiber will appear as that between mortar and aggregate, the mechanism is possibly due to a wall effect, flocculation of binder, microbleeding effect, transportation, precipitation and nucleation of ion. At the second stage, the self-desiccation shrinkage, chemical shrinkage，drying shrinkage，the difference in expansion coefficient between aggregate and paste, hydration of paste and re-crystallization of hydrated products can be contributed to the mechanism, polypropylene fiber make the surface of concrete difficult to lose water and migrate water and the polypropylene fiber in general are effective in controlling shrinkage cracking in concrete. At the last stage, concrete may suffer load, aggressive agent , freeze-thaw, alkali-aggregate reaction and continuous hydration of paste, polypropylene fiber postpone the degradation of concrete. In addition, the influence of water-cement ratio, admixtures and the length-wide ration, shape, volume of the polypropylene fiber concrete were reviewed.
Polypropylene fiber cement concrete interface zone between mortar and aggregate shrinkage crack-resistance property
Chen-Fei Wang Di-Tao Niu
School of Civil Engineering,Xi an University of Architecture and TechnologyXi an 710055,P.R.China School of Civil Engineering,Xi an University of Architecture and Technology Xi an 710055,P.R.China
国际会议
长沙
英文
998-1002
2009-10-26（万方平台首次上网日期，不代表论文的发表时间）