M. Taylor

Bio: M. Taylor is an academic researcher from Brookhaven National Laboratory. The author has contributed to research in topics: Glass fiber & Kevlar. The author has an hindex of 1, co-authored 1 publications receiving 10 citations.

Interfacial and mechanical behavior of fiber-reinforced calcium phosphate cement composites☆

Abstract: One basic drawback of hydrothermally synthesized calcium phosphate cements (CPC) is that they are brittle and fragile. To solve this problem, we investigated the interfacial chemistry, microstructure development, and toughness-related physical properties of CPC composites reinforced with strong fibrous materials (carbon fiber, glass fiber, and Kevlar). The most ideal interfacial structures between fiber and CPC were observed in carbon-fiber-reinforced composites, i.e., intermediate layers that were created by a moderate interfacial interaction of carbon with CPC promoted cross-linking, which tightly interconnects the fibers and thereby significantly improves ductility and toughness. In contrast, an undesirable interfacial mode was identified in Kevlar- and glass-fiber-reinforced CPC composites that were autoclaved at 250°C: the alkali-catalyzed hydrolysis of Kevlar in the composite prevented adherence to the CPC, and an extensive interaction between CPC and glass fiber resulted in the formation of porous intermediate layers. These negative factors were correlated directly to a lack of toughness and to catastrophic failure.

Cement compositions comprising strength-enhancing lost circulation materials and methods of cementing in subterranean formations

Abstract: The present invention provides cement compositions comprising a strength-enhancing lost circulation material, and methods for cementing using such cement compositions. Exemplary embodiments of the cement compositions comprise cement, water, and a strength-enhancing lost circulation material. Optionally, other additives suitable for inclusion in cement compositions may be added.

Phosphate modified calcium aluminate cement for radioactive waste encapsulation

Abstract: AbrstractThe present study is part of a wider investigation to develop an alternative cementing system for the encapsulation of problematic low and intermediate level radioactive waste. It has been suggested that alternative cementing systems, with lower internal pH than conventional Portland cement based composite cements, may reduce the corrosion of some reactive metals and may be beneficial for the long term durability of wasteforms. A potential alternative is an acid–base cementing system, based on mixing calcium aluminate cement (CAC) with acidic phosphate solutions. Although these systems have been studied previously, there has been no systematic investigation to identify phosphates for producing suitable matrixes for application in radioactive waste encapsulation. In the current study, monophosphate modified CAC formulations did not set or develop significant strength, whereas polyphosphate modified CAC formulations exhibited rapid setting and strength development. It is proposed that polyp...

Pultruded glass fiber- and pultruded carbon fiber-reinforced chemically bonded phosphate ceramics

Abstract: The main goal of this article is to present the pultrusion process for glass fiber- and carbon fiber-reinforced chemically bonded phosphate ceramics (CBPCs). Samples were fabricated with 15% of fibers by volume. An improvement (with respect to the matrix) of 29 times for the bending strength of CBPCs pultruded graphite fibers composites and 17 times for CBPCs pultruded glass fiber composites is shown. Bending strength was obtained with the three-point bending test. The CBPCs were fabricated by mixing special formulations of both wollastonite powder and phosphoric acid, through resonant acoustic mixing. The microstructure was analyzed with optical and scanning electron microscopes. X-ray compositional maps were obtained for the cross-section of pultruded samples with SEM-EDS. Pultruded sample response at high temperature and thermal shock were also analyzed. The structural characterization of samples was conducted by using X-ray micro tomography.