【摘 要】
：
Calcium sulfate whisker (CaSO4 whiskers), a new type of microfiber material, was used in cement matrix to increase the strength of the cement based composites. Effect of CaSO4 whiskers on the mechanical properties of the resulting cement mortar was also s
【机 构】
：
Department of Civil Engineering, Jianghai Polytechnic College ,Yangzhou 225101, China;Department of
【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
Calcium sulfate whisker (CaSO4 whiskers), a new type of microfiber material, was used in cement matrix to increase the strength of the cement based composites. Effect of CaSO4 whiskers on the mechanical properties of the resulting cement mortar was also studied. The results showed that the flexural strength and compressive strength of the mortar specimen was improved as high as 28.3％ and 8.5％ by incorporating 5 wt％ CaSO4 whiskers. Also, the chemical composition and structural transformation of the hardened cement matrix with CaSO4 whiskers were identified by X-ray diffraction (XRD) and scanning electron microscope (SEM). Conclusion can be drawn that CaSO4 whiskers can effectively retard the formation and restrict the coalescence of micro-crack expansion. The interaction mechanism of CaSO4 whisker on the reinforcement is mainly on three aspects: whisker pullout, crack deflection, and crack bridging. Mercury intrusion porosimetry (MIP) tests have confirmed that for 28 d cement mortar, the harmless pores increased from 9.33％ to 10.62％, and the harmful pores decreased from 2.08％ to 1.90％. Therefore, the whisker can optimize the pore size distribution of the resulting cement mortar.
其他文献
A new hot mixed epoxy asphalt system was developed. The reaction process of epoxy resin was characterized by Fourier transform infrared spectroscopy (FTIR). The viscosity was investigated by Brinell viscometer when epoxy resin was mixed with asphalt. The
A simple strategy was developed to prepare a tough, self-healing, antibacterial and moldable hydrogel by introducing the natural polyphenolic compound tannic acid (TA) as a cross-linking center for hydrogen bonds. Polyvinyl alcohol (PVA)-TA hydrogel was p
Nano-spherical Co2+-doped FeS2 was synthesized through a simple solvothermal method. The products were investigated using XRD, FE-SEM, BET, ICP, EDS, TEM, HRTEM, XPS, and UV-vis spectroscopy. The results indicated that Co2+ ion could change the particle n
The La-Mg-Ni-Mn-based AB2-type La1-xCexMgNi3.5Mn0.5 (x = 0, 0.1, 0.2, 0.3, and 0.4) alloys were fabricated by melt spinning technology. The effects of Ce content on the structures and electrochemical hydrogen storage performances of the alloys were studie
Three different kinds of coatings were coated on the concrete surface, and the changes in appearance, surface roughness, microstructure and components of coatings in artificial sewage were investigated. In addition, the strength, micrograph, mineral compo
Polytetrafluoroethylene (PTFE) is a commonly used seal material for oil-free engine that is well known for its excellent tribological properties. In this work, the nano-ZrO2 particles were used as the friction modifiers to improve the friction and wear pe
Sapphire,belonging to hexagonal crystal system,is typically anisotropic which makes it direction-sensitive.To research the effects of growth directions on properties of sapphire,c-[0001]seed(c-sapphire)and a-[11-20]seed(a-sapphire)were used to prepare sap
Silicon nitride ceramics were prepared by means of a hot-press sintering method. The ablation behavior was studied by plasma wind tunnel tests. The data suggested that, under low heat flux and stagnation pressure conditions, the ablation process was contr
A three-dimensional dynamic model for nano/micro-fabrications of silicon was presented.With the developed model, the fabrication process of silicon on nothing (SON) structure was quantitatively investigated. We employ a diffuse interface model that incorp
ZrB2-SiC based ultra-high temperature ceramic (UHTC) struts were firstly proposed and fabricated with the potential application in the combustor of scramjets for fuel injection and flame-holding for their machinability and excellent oxidation/ablation res