The risk of air emboli is a concern for all perfusionists. A new clamping device for use with centrifugal pumps is designed to clamp both the arterial and venous lines at the first indication of air or retrograde flow, thereby allowing the perfusionist to evaluate the situation and correct the problem before entraining air into the arterial pump head. After evaluating this device in our lab, we...

The influence of the air-entraining agent (AEA) on a density, volume entrained air mortar mix and compressive strength hardened was studied in this article. Results show that addition AEA results reduction water to cement ratio provide targeted flow density depends air. causes decrease (C:S=1:2) by 8,2% increase 13,9% after 28 days hardening compared without AEA. further sand content (C:S=1:3) ...

P. Priyadharshini, G. Mohan Ganesh, A.S. Santhi Abstract— The reduction in moisture of fresh concrete results in plastic shrinkage due to tensile stress induced by capillary pressure. When the tensile strength signs beyond the capacity of concrete, it cracks and this effect in early stage of concrete is termed as plastic shrinkage of concrete. This becomes a serious issue for large surface area...

Recent tendencies in concrete technology have been towards to high- performance concrete with a low water-cement ratio. However, high performance concretes have some problems. One of the problems is early-age cracking due to autogenous shrinkage. This study presents the results of an experimental investigation carried out to evaluate the autogenous shrinkage of high-strength concrete. Accordi...

Self-consolidating concrete (SCC) is becoming a popular choice in concrete industry due to ease of placement in congested reinforcements, reduced labor and equipment, nonsegregating character, and smooth surface. Due to its sensitivity to aggregate grading, proportions, admixtures, and filler contents and being a relatively new material, more information are required on the effects of aggregate...

Mortars intended for plastering and masonry works normally comply to EN 413-1 and/or ASTM C91 specifications. This paper seeks assess the suitability of geopolymers (GPs) composed metakaolin seashell wastes applications. The sodium hydroxide silicate activators contained air-entraining molecules secure about 10% ± 2% air content. Just like cement-based mortars, test results showed that mechanic...