Experimental study on self-healing effect of FRCC with PVA fibers and additives against freeze/thaw cycles
نویسندگان
چکیده
ID No: 252 ABSTRACT It has been confirmed by some previous research that some types of fiber-reinforced cementitious composites (FRCCs) particularly using synthetic fibers (e.g. polyvinyl alcohol; PVA) has a great capability of self-healing of cracks. In this study, selfhealing capability of FRCCs with the effects of additives such as silica fume and excess PVA dosage were tested. Experimental studies were carried out to evaluate the self-healing capability against freeze/thaw cycles, according to the JIS A 1148 (ASTM C 666-A) method. The damaged FRCC specimens were immersed in a water bath for up to 28 days to induce self-healing curing. For evaluating the self-healing capability, measurements of relative dynamic Young’s-modulus (RDYM) and pore structures were carried out. The results confirmed recovery of the RDYM and densification of the microstructures due to CaCO3 precipitation in the damaged FRCC specimens. In addition, an admixture of PVA could be expected to enhance the self-healing capability of cracks.It has been confirmed by some previous research that some types of fiber-reinforced cementitious composites (FRCCs) particularly using synthetic fibers (e.g. polyvinyl alcohol; PVA) has a great capability of self-healing of cracks. In this study, selfhealing capability of FRCCs with the effects of additives such as silica fume and excess PVA dosage were tested. Experimental studies were carried out to evaluate the self-healing capability against freeze/thaw cycles, according to the JIS A 1148 (ASTM C 666-A) method. The damaged FRCC specimens were immersed in a water bath for up to 28 days to induce self-healing curing. For evaluating the self-healing capability, measurements of relative dynamic Young’s-modulus (RDYM) and pore structures were carried out. The results confirmed recovery of the RDYM and densification of the microstructures due to CaCO3 precipitation in the damaged FRCC specimens. In addition, an admixture of PVA could be expected to enhance the self-healing capability of cracks.
منابع مشابه
Strength Characteristics of Clay Mixtures with Waste Materials in Freeze-Thaw Cycles
Waste tires, rubbers, plastic and steel materials, normally produced in every society, enter the environment and cause serious problems. These problems may, to some extent, be reduced by finding applications for them in engineering, for example, they can be used for geotechnical applications as backfill material and solving problems with low shear strength soils. Such materials may be subjected...
متن کاملInfluence of Rapid Freeze-Thaw Cycling on the Mechanical Properties of Sustainable Strain-Hardening Cement Composite (2SHCC)
This paper provides experimental results to investigate the mechanical properties of sustainable strain-hardening cement composite (2SHCC) for infrastructures after freeze-thaw actions. To improve the sustainability of SHCC materials in this study, high energy-consumptive components-silica sand, cement, and polyvinyl alcohol (PVA) fibers-in the conventional SHCC materials are partially replaced...
متن کاملFABRICATION AND EVALUATION OF PHYSICALLY CROSSLINKED STIMULI SENSITIVE POLYMERIC BLEND OF PVA-GELATIN AS DRUG DELIVERY SYSTEM BY FREEZE THAW CYCLES
Vacuum dried Metronidazole hydrochloride (MTZ) loaded Crosslinked polymeric blend of Poly(vinyl)alcohol (PVA) and Gelatin(GE) in different ratios by 30 freeze/thaw cycles (FTC) tested for stimuli sensitivity and crosslinking at various pH, temperature, ionic concentration and oscillatory test along with dye absorption test showed maximum swelling in alkaline pH and decreased swelling with incre...
متن کاملEffects of number of freeze-thaw cycles and freezing temperature on mode I and mode II fracture toughness of cement mortar
Natural and artificial materials including rocks and cement-based materials such as concrete and cement mortar are affected both physically and chemically by various natural factors known as weathering factors. The freeze-thaw process, as a weathering factor, considerably affects the properties of rocks and concrete. Therefore, the effect of the freeze-thaw process on the physical and mechanica...
متن کاملEffect of freeze-thaw cycle on strength and rock strength parameters (A Lushan sandstone case study)
In an era of continued economic development around the globe, numerous rock-related projects including mining and gas/oil exploration are undertaken in regions with cold climates. Winters in the Iranian western and northwestern provinces are characterized by a high precipitation rate and a cold weather. Under such conditions, rocks are exposed to long freezing periods and several freeze-thaw (F...
متن کامل