【摘 要】
：
Backscattered electron images (BSE) obtained by scanning electron microscope was used to quantitatively characterize the microstructure of interfacial transition zone (ITZ) in concrete. Influences of aggregate size (5, 10, 20, and 30 mm), water to cement
【机 构】
：
School of Materials Science and Engineering, Jiangsu Key Laboratory of Construction Materials, South
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
Backscattered electron images (BSE) obtained by scanning electron microscope was used to quantitatively characterize the microstructure of interfacial transition zone (ITZ) in concrete. Influences of aggregate size (5, 10, 20, and 30 mm), water to cement ratio (0.23, 0.35 and 0.53) and curing time (from 3d to 90d) on the microstructure of interfacial transition zone between coarse aggregate and bulk cement matrix were investigated. The volume percentage of detectable porosity and unhydrated cement in ITZ was quantitatively analyzed and compared with that in the matrix of various concretes. Nanoindentation technology was applied to obtain the elastic properties of ITZ and matrix, and the elastic modulus of concrete was then calculated based on the Lu & Torquato model and self-consistence scheme by using the ITZ thickness and elastic modulus obtained from this investigation. The experimental results demonstrated that the microstructure and thickness of ITZ in concrete vary with a variety of factors, like aggregate size, water to cement ratio and curing time. The relative low elastic properties of ITZ should be paid attention to, especially for early age concrete.
其他文献
SiCp/Cu composites with a compact microstructure were successfully fabricated by vacuum hot-pressing method. In order to suppress the detrimental interfacial reactions and ameliorate the interfacial bonding between copper and silicon carbide, molybdenum c
The nanostructure of cementitious materials has important effects on concrete properties.The effects of rice husk ash (RHA) on cement hydration product phases and interfacial transition zone (ITZ) in mortar were investigated from the nano-scale structure
Crack potential and hydration processes of the cement pastes were monitored using an up-to-date eccentric steel cracking frame (ESCF), associated with the non-contact electrical resistivity apparatus, independently. The objective of employing the ESCF is
Thermodynamic stability,microvoid distribution and phases transformation of natural pozzolana opal shale (POS) were studied systematically in this work.XRD analysis showed that opal-CT,including microcrystal cristobalite and tridymite,is a major component
The properties ofAl/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-WC-ZrO2 composite anode for zinc electrowinning were investigated.The electrochemical performance was studied by Tafel polarization curves (Tafel),electrochemical impedance spectroscopy (EIS)
Through the comparison of calcination conditions between cement preclinkering technology and cement precalcining technology, we studied the characteristics of temperature ifeld distribution of cement preclinkering technology systems including cyclone preh