This research paper describes the study of combined effect of Fly Ash (FA) and Rice Husk Ash (RHA) on properties of concrete as partial replacement of Ordinary Portland Cement (OPC). These by-products are having high pozzolanic reactivity. In this research, the composition of mix was used with 10% RHA along with 10, 20 and 30% FA as partial replacement of cement. In this study, the compressive ...

The effects of an intravenous infusion of 1 microgram/kg/min nitroglycerin were studied on systemic arterial properties in nine acutely instrumented dogs. Aortic impedance and pulse-wave velocity were calculated from measured pressure and flow signals collected during random ventricular pacing. Central aortic diameter was simultaneously determined with ultrasonic dimension crystals. Mean blood ...

In this paper, we propose a new method for automatically tracking the motion of local region in left ventricular myocardium by means of ultrasonic pulsed Doppler signal. This method consists of a velocity detection procedure based on correlation weighted mean instantaneous velocity and a motion tracking procedure employing a myocardial elastic model. Most of ultrasonic pulsed Doppler signals ob...

Abstract The current study aimed to investigate the influence of expired hardened cement blended with ground granulated blast furnace slag on bond, microstructure, and durability high-strength concrete (HSC). Five mixes are prepared; first mix is taken as a control, remaining four used experimental blends. HSC characteristics evaluated by compressive, flexural, splitting tensile, tests. Further...

The aim of this study was to evaluate ultrasonic P-wave velocity as a feature for predicting some physical and mechanical properties that describe the behavior of local building limestone. To this end, both ultrasonic testing and compressive tests were carried out on several limestone specimens and statistical correlation between ultrasonic velocity and density, compressive strength, and modulu...

Pulse ultrasound technique has been applied to measure the reflected echo signals from vapor bubbles in boiling two-phase flow. In this study, an ultrasonic transducer was developed for the ultrasonic measurement in boiling two-phase flow under the atmospheric pressure. Since the Curie point of piezoelements of the transducer is above 250 ̊C, it has an allowable temperature limit of 120 ̊C. The b...

The relevance of concrete is growing in the modern world due to population growth and technological advancement. necessity for specialty arises from various usage regions constructions. Foam one most useful varieties special because it offers insulation heat sound. mechanical physical properties foam are influenced by a variety elements. characteristics substantially impacted mineral admixtures...

Abstract The setting behavior of concrete mixtures can be indirectly monitored by the penetration resistance test given ASTM C 403. Arbitrary values are associated to initial and final set times. This is carried out on previously sieved mortar portion mixture, which makes its practical use rare. Alternatively, ultrasound testing used characterize this transition period, since propagation ultras...

This paper presents the residual mechanical properties of concrete made with crushed bricks and clay roof tile aggregates after exposure to high temperatures. One referent mixture and eight mixtures with different percentages of replacement of natural aggregate by crushed bricks and roof tiles are experimentally tested. The properties of the concrete were measured before and after exposure to 2...