PURPOSE To evaluate the effects of hydrogen peroxide pretreatment and heat activation of silane on the shear bond strength of fiber-reinforced composite posts to resin cement. MATERIALS AND METHODS The specimens were prepared to evaluate the bond strength of epoxy resin-based fiber posts (D.T. Light-Post) to dual-curing resin cement (RelyX U200). The specimens were divided into four groups (n...

Abstract Geopolymer concrete represents the future of green and sustainable concrete. It has a large impact on construction industry owing to its better performance than that conventional Portland cement This study aimed identify effect curing conditions physical, mechanical, microstructural properties specimens using ambient oven-curing. In experimental analysis, we tested slump setting time f...

    Freezing and thawing resulting from the ingression of water into concrete causes cracking or spalling. Corrosive ions such as chloride or sulfate penetrate the concrete surface and eventually reach the reinforcing steel. This causes the steel to corrode.     Because of the high maintenance and replacement costs, responsible officials should be increasingly concerned about the growing number...

Nuclear Magnetic Resonance (NMR) is used to study the early-age hydration as well autogenous shrinkage and drying of cement paste with addition coir fibers. The dosage water content fibers are evaluated. results show that added have a negligible influence on kinetics. However, internal curing effect saturated competition induced by dry visualized. As fiber increases, decrease due reinforcing ef...

The reuse of construction and demolition waste as a substitute for natural coarse aggregate in the production recycled concrete has been widely used. In order to study capillary water absorption performance waterborne-polyurethane-modified (WPUMRC), effects different curing systems, polymer-cement ratios, waterborne polyurethane addition methods on cumulative rate WPUMRC were analyzed, through ...

Lime treatment can enhance the workability and hydro-mechanical properties of soil through different physical-chemical reactions. Nevertheless, beneficiary effect lime be altered when was exposed to wetting-drying cycles, depending on wetting fluid state. In present study, changes in small strain shear modulus (Gmax) microstructure a compacted lime-treated silt under cycles were studied. The un...

the present work reports and discusses the results of a 3d simulation of the injection molding process of a rubber compound that includes the mold flling stage and  material curing, using the computer code is developed in “udf” part of the fluent 6.3 cae software. the data obtained from a rheometer (mdr 2000) is used to characterize the rubber material in order to fnd the cure model parameters ...