introduction: mineral trioxide aggregate (mta) mixed with normal saline has short working time, delayed setting time, and poor consistency when used as an apical plug. a preliminary study suggested that substituting normal saline with ky jelly or 5% calcium chloride (cacl 2 ) as a vehicle expedites the setting time of mta. the present in vitro study compared the microleakage of proroot mta mixe...

This paper presents the experimental results of the investigation of various properties related to the durability and longterm performance of mortars made of Fly Ash blended cement, FA and Ordinary Portland cement, OPC. The properties that were investigated in an experimental program include; equilibration of specimen in different relative humidity, determination of total porosity, compressive ...

Corrosion induced by chloride ions becomes a critical issue for many reinforced concrete structures. The chloride ingress into concrete has been usually simplified as a di↵usion problem where the chloride concentration throughout concrete is estimated analytically. However, this simplified approach has several limitations. For instance, it does not consider chloride ingress by convection which ...

Cement is widely used in marine concrete, and its resistance to chloride ion corrosion has been considered. In this paper, based on a laboratory test, the influence of different hydrostatic pressures, coarse aggregate contents w/c ratios performance analyzed. Based COMSOL finite element software, two-dimensional cementitious materials model established, simulation results are compared with expe...

Abstract This study systematically investigates the hardened properties, durability and void distribution of large-scale 3D printed cement-based materials (3DPC). Experimental results indicate that 3DPC has higher compressive flexural strengths, lower drying shrinkage, better resistance against sulfate attack carbonation than mold-cast materials, but to frost damage chloride ion penetration. Co...

This case study aimed to compare the differences in durability and prestress loss between normal-weight-concrete (NC) lightweight-aggregate-concrete (LWC) prestressed box girders, which were constructed at same time area, so as verify superiority of using synthetic lightweight aggregate (LWA) made from reservoir sediments bridges. For NCs LWCs used basic mechanical properties (compressive stren...

In this experimental work, Manganese oxide (MnO2), Zinc oxide (ZnO), Iron oxide (Fe2O3) and Magnesium chloride (MgCl2) were used as activating flux to investigate the effects for SS 304 in tungsten inert gas (TIG) welding. Ultimate tensile strength, percentage elongation, Penetration depth and width were studied of material SS 304. The experimental results indicated that the MnO2 and Fe2O3 flux...

Recycled concrete aggregates (RCAs) have been demonstrated as an alternative source to exhaustible natural aggregates. In this paper, we focus on the enhancement treatments for coarse and fine RCAs effect of these durability recycled (RC) made from treated by weakening strengthening cement paste adhered their surface. We conducted comparative analyses improvement mechanical properties. The resu...