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Full-Text Articles in Engineering Science and Materials
Sulfate Resistance Of Nanosilica Contained Portland Cement Mortars, Iani Batilov Batilov
Sulfate Resistance Of Nanosilica Contained Portland Cement Mortars, Iani Batilov Batilov
UNLV Theses, Dissertations, Professional Papers, and Capstones
Soils, sea water and ground water high in sulfates are commonly encountered hostile environments that can attack the structure of concrete via chemical and physical mechanisms which can lead to costly repairs or replacement. Sulfate attack is a slow acting deteriorative phenomenon that can result in cracking, spalling, expansion, increased permeability, paste-to-aggregate bond loss, paste softening, strength loss, and ultimately, progressive failure of concrete. In the presented research study, Portland cement (PC) mortars containing 1.5% to 6.0% nanosilica (nS) cement replacement by weight were tested for sulfate resistance through full submersion in sodium sulfate to simulate external sulfate attack. Mortars …
Alkali-Activated Natural Pozzolan/Slag Binder For Sustainable Concrete, Meysam Najimi
Alkali-Activated Natural Pozzolan/Slag Binder For Sustainable Concrete, Meysam Najimi
UNLV Theses, Dissertations, Professional Papers, and Capstones
This study aimed to fully replace Portland cement (PC) with environmentally friendly binders capable of improving longevity of concrete. The new binders consisted of different proportions of natural Pozzolan and slag which were alkaline-activated with various combinations of sodium hydroxide and sodium silicate. A step-by-step research program was designed to (1) develop alkali-activated natural Pozzolan/slag pastes with adequate fresh and strength properties, (2) produce alkali-activated natural Pozzolan/slag mortars to assess the effects of dominant variables on their plastic and hardened properties, and (3) finally produce and assess fresh, mechanical, dimensional, transport and durability properties of alkali-activated natural Pozzolan/slag concretes. The …