Coarse aggregates gradings have varying effects on the properties of concrete. sizes 10mm, 20mm and 25mm were used for this study. Sieve analysis was conducted these aggregates. Their coefficients curvature (Cc) ranged between 1.01 1.19, while uniformity (Cu) 1.24 1.73, showing that they are all uniformly graded. 10mm coarse mixed in various proportions to produce five different concrete mixes ...

RESUMO O comportamento da alvenaria estrutural resulta do desempenho de cada componente: unidades, juntas argamassa, grautes e armaduras. Comercialmente, os blocos para são produzidos com concreto seco ou zero-slump. Sua dosagem propriedades físicas se diferem consideravelmente dos concretos convencionais dependem eficiência compactação das máquinas vibroprensas. Ensaiar elementos em tamanho na...

in this paper, we give a characterization of strongly jordan zero-product preserving maps on normed algebras as a generalization of  jordan zero-product preserving maps. in this direction, we give some illustrative examples to show that the notions of strongly zero-product preserving maps and strongly jordan zero-product preserving maps are completely different. also, we prove that the direct p...

Participants in human computation workflows may become fatigued or get bored over long, interminable working hours. This leads to a slump of motivation and morale, which in the long run causes reductions in both productivity and work quality. In this paper we propose an initial investigation into possible ways to alleviate worker fatigue and boredom by employing micro-breaks that provide timely...

Fundamental interactions between polymeric superplasticizers and cement are studied. Cements with different alite-, belite-, C3Aand C4AF-contents are used. The use of commercially available superplasticizers like melamine formaldehyde sulfite(MFS) and β-naphthalene sulfonic acid formaldehyde-(NSF) resins is investigated. These superplasticizers (industrial products) are characterized by means o...

This study presents the effect of incorporating metakaolin (MK) on the mechanical and durability properties of high strength concrete for a constantwater/binder ratio of 0.3.MKmixtureswith cement replacement of 5, 10 and15 %weredesigned for target strength and slump of 90 MPa and 100 ± 25 mm. From the results, it was observed that 10 % replacement level was the optimum level in terms of compres...