abstract: Ultra-high performance concretes with steel microfibers have been studied in depth the aim of producing more efficient and durable structures. The these materials depends on characteristics interface between cementitious matrix. This research investigates micro-nanomechanical properties interfacial transition zone matrix ultra-high composite. effect water/cement ratio distance from mi...

Experiences in the development of Ultra High Performance Concrete found a very high flowability in concrete with low water powder ratio. Because of the high viscosity of the cement paste, compaction was necessary. To improve the compaction characteristics of the concrete the idea of adding coarse aggregate was developed. The first tests showed a good workability of the fresh concrete and a good...

In this paper a novel very high performance current mirror is presented. It favorably benefits from such excellent parameters as: Ultra high output resistance (36.9GΩ), extremely low input resistance (0.0058Ω), low output (~0.18V) and low input voltage (~0.18V) operation, very low power consumption (20μW), very low offset current (1pA), ultra wide current dynamic range (150dB), and ultra high a...

Abstract Marine sediments can be stabilized by ultra high-strength binders: cement, Cement Kiln Dust (CKD) and slag. The properties of the soil indicate potential to their reuse. This study investigated performance unconfined compressive strength (UCS) in marine binder (cement, CKD, slag), tested ultrasonic P-waves. Materials include 194 specimens collected from port Gothenborg. experiment was ...

In this work, the effect of graphene oxide nanosheet (GONS) additives on the properties of cement mortar and ultra-high strength concrete (UHSC) is reported. The resulting GONS-cement composites were easy to prepare and exhibited excellent mechanical properties. However, their fluidity decreased with increasing GONS content. The UHSC specimens were prepared with various amounts of GONSs (0-0.03...

This paper presents the development and performance assessment of a novel ultra-lightweight high ductility cement composite (ULHDCC) incorporated with fly ash cenospheres, rubber powders low fiber content 0.7%. To address brittle nature such composite, this utilized surface treated polyethylene (PE) fibers to improve behavior, used replacing part cenospheres reduce matrix fracture toughness ach...

In undergoing this life, many people always try to do and get the best. New knowledge, experience, lesson, and everything that can improve the life will be done. However, many people sometimes feel confused to get those things. Feeling the limited of experience and sources to be better is one of the lacks to own. However, there is a very simple thing that can be done. This is what your teacher ...

‎ introduction: controversial results have been reported about the effect of morphine and stress on learning and spatial memory in rodents. there are very few studies about the effects of ultra low doses of morphine on memory. in this study, effects of acute administration of low and usual doses of morphine on memory formation and retention in the presence and absence of repeated stress were in...

BACKGROUND Both vertebroplasty and balloon kyphoplasty have been described for treatment of vertebral compression fractures. Vertebroplasty is known for its high leakage rate compared with balloon kyphoplasty. In vitro studies have shown that high-viscosity cements significantly decrease the incidence of cement leakage and increase the predictability of cement fill in cancellous bonelike substr...