Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental investigation of the interface bond properties between SHCC and concrete under sulfate attack
Highlights The bonding strength degradation rate of SHCC was slower than concrete. The corrosion resistance coefficient of SHCC remained 60% at 120 corrosion cycles. The interface structure in SHCC can well prevent the invasion of sulfate ions.
Abstract A new class of high-performance fiber reinforced cementitious composite, namely Strain-Hardening Cementitious Composites (SHCC), is characterized by strain-hardening, multiple-cracking and tight crack width. This paper investigates the coupled action of sulfate and wet-dry cycles on the degradation degree of interfacial bonding performance of SHCC/concrete, through slant shear and splitting tensile test coupled with Na2SO4 wet-dry cycles. The degradation mechanism is investigated with SEM and XRD. The results show that the erosion resistance of SHCC/concrete interface is better than concrete/concrete for a range of cycles from 0 to 120. The strength of SHCC/concrete decreased more slowly than concrete/concrete, and the corrosion resistance coefficient can still reach above 60% even after 120 cycles (no matter in Type A or Type B test). By contrast, the reinforced concrete B and existing concrete A are separated from one another, when the cycles are more than 90 in Type B test. SHCC and existing concrete A was found to form a more compact structure by micromechanical analysis, which reduced calcium vanadium and enhanced the sulfate resistance of structure.
Experimental investigation of the interface bond properties between SHCC and concrete under sulfate attack
Highlights The bonding strength degradation rate of SHCC was slower than concrete. The corrosion resistance coefficient of SHCC remained 60% at 120 corrosion cycles. The interface structure in SHCC can well prevent the invasion of sulfate ions.
Abstract A new class of high-performance fiber reinforced cementitious composite, namely Strain-Hardening Cementitious Composites (SHCC), is characterized by strain-hardening, multiple-cracking and tight crack width. This paper investigates the coupled action of sulfate and wet-dry cycles on the degradation degree of interfacial bonding performance of SHCC/concrete, through slant shear and splitting tensile test coupled with Na2SO4 wet-dry cycles. The degradation mechanism is investigated with SEM and XRD. The results show that the erosion resistance of SHCC/concrete interface is better than concrete/concrete for a range of cycles from 0 to 120. The strength of SHCC/concrete decreased more slowly than concrete/concrete, and the corrosion resistance coefficient can still reach above 60% even after 120 cycles (no matter in Type A or Type B test). By contrast, the reinforced concrete B and existing concrete A are separated from one another, when the cycles are more than 90 in Type B test. SHCC and existing concrete A was found to form a more compact structure by micromechanical analysis, which reduced calcium vanadium and enhanced the sulfate resistance of structure.
Experimental investigation of the interface bond properties between SHCC and concrete under sulfate attack
Gao, Shuling (Autor:in) / Jin, Jiapeng (Autor:in) / Hu, Guanhua (Autor:in) / Qi, Lin (Autor:in)
Construction and Building Materials ; 217 ; 651-663
17.05.2019
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch