In this paper, twelve different concrete mixes made from local materials were studied with a view to determining which of the mix designs will produce high-performance concrete. Varied water-cement ratios (w/c) 0.3, 0.35, and 0.4 combinations particle sizes coarse aggregates. Twelve then produced, cast, cured for 7, 14, 21, 28, 45, 90 days. Superplasticizer was used facilitate workability mixes...

Mortar with high workability even without a water-reducing agent and with high tensile and compressive strengths (3.1 and 78 MPa, respectively) was obtained by using as an admixture silica fume that had been surface treated with a silane coupling agent. The treatment enhanced the wettability of silica fume by water, thereby increasing the workability of the mortar mix. It also enhanced the bond...

OBJECTIVE To analyze the variables associated with fatigue perception and workability on workers working 12-hour fixed night and day shifts. METHODS A cross-sectional study was carried out. Forty-three workers, working 12-hour fixednight and day shifts in a textile factory, filled out questionnaires about fatigue, workability index, individual characteristics, life style and working condition...