An experimental investigation was conducted to evaluate the impact of different curing practices on porosity and compressive strength concrete. The targeted concrete at 28-day 20 N/mm2. Plain cubes were prepared with a mix ratio 1:1.5:3 by weight 0.6 water-cement ratio. A total 120 tested 7th, 14th, 21st, 28th 56th day periods for slump, strength. four methods used immersion, jute sack, plastic...

This study evaluated the surface hardness and wear resistance of indirect composites (Artglass and Solidex) and the existence of a correlation between these properties. Twenty-four specimens (12 per material) were fabricated using a polytetrafluoroethylene matrix (5.0 mm in diameter; 7.0 mm high) following an incremental technique. Polymerization was done with a xenon stroboscopic light curing ...

OBJECTIVE The aim of this study was to assess the effect of bleaching on elution of monomers from nanofilled and microhybrid composites. MATERIALS AND METHODS 80 samples (5mm diameter and 3mm thickness) of each composite were prepared. After curing, half of them were randomly polished. Each group was divided into 8 subgroups and immersed in water or 10%, 20% and 30% H2O2 for 3 or 8 hours. Elu...

Statement of problem. Acrylic resin is most commonly used for denture bases. However, acrylic resin has week points of volumetric shrinkage during polymerization that reduces denture fit. The expandability of POSS (Polyhedral Oligomeric Silsesquioxane) containing polymer could be expected to reduce the polymerization shrinkage of denture bases and would increase the adaptability of the denture ...

Abstract This manuscript presents preliminary results on the cement paste potential, with and without carbon nanomaterials, to heal high-temperature cracks. Cement beams were subjected thermal loading of 200°C 400°C after 28 days water curing. High temperature caused formation microcrack networks specimen’s surface. Self-healing was achieved by exposing cracked samples cyclic immersion. The eff...

A new lubricating coating with functionalized graphene oxide (fGO) consisting of (GO) different oxidation degrees, n-octylamine basal plane GO (bGO), and edge (eGO) was developed or without 3-aminopropyltrimethoxysilane (APTMS) to reduce friction in macroscale contact water. The optimal preparation condition the obtained by single factor evaluation a series factors (20 % APTMS aqueous solution,...

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 ...

Advancements in hybrid sol-gel technology have provided a new class of holographic materials as photopolymerizable glasses. Recently, number photosensitive glass compositions with high dynamic range and spatial resolution been reported their excellent capability for volume holography has demonstrated. Nevertheless, challenges remain, particularly relation to the processing time environmental st...

Conditions of adhesive cure process play a very important role in the quality of adhesive joints. It is known that the cure stage of adhesives correlates with the glass transition temperature and strength of adhesion. The objective of our present work was to quantitatively characterize cure of the adhesives with acoustic method. Pulse-echo mode was used for the study. Changes in acoustic parame...

We commercialized Reactive Coke Agglomerate (RCA), a cement-bonded pellet to decrease the thermal reserve zone temperature for the reduction of the reducing agent rate of blast furnaces. To achieve a high productivity of supplying RCA to large blast furnaces, a rapid curing process of RCA using steam was investigated. We obtained rapid curing of RCA within 18 h by combining primary curing for 1...