Abstract
Increases in bending tests by the addition of low volume fractions of Polypropylene (PP) Short Fibers PP. These toughness increases are similar to those attained by Fiber Reinforced Concrete (FRC) referred elsewhere as Engineered Cementitious Composites (ECC), having some ductility and strain hardening in direct tensile and flexural tests. Concretes mixtures were manufactured using natural pozzolanic blended Portland cement, volcanic crushed coarse aggregates and fine sand from Sahara desert dunes (0-1 mm) from Canary Islands quarries and sand reservoirs, respectively, besides ordinary siliceous sand (0-4 mm) and fly ash from an anthracite-coal heat generator.
Highlights
The additions of low volume fractions (0.1%) of short Polypropylene (PP) fibers in concrete mainly attempt to reduce the early age microcracking of fresh concrete admixtures after placing
Afterwards the mean of these four Young Modules data is included in Table 8, and using the usual formula referred above Each of the other mechanical properties, reported in Table 8, were obtained as the mean value of two different specimens tested
As the fiber content increases in the referred volume fractions, the Vebe time t(s) of fresh Fiber Reinforced Concrete (FRC) samples increases too (Figure 2), evolving from stiff to very stiff, dry and extremely dry consistency, respectively
Summary
The additions of low volume fractions (0.1%) of short Polypropylene (PP) fibers in concrete mainly attempt to reduce the early age microcracking of fresh concrete admixtures after placing. Other polymeric fibres can be reco mmended too for this purpose. These low-additions do not have any remarkable influence on the mechanical properties of hardened concrete (1, 2). To improve the tensile and flexural mechanical properties of concrete structures, short hooked or wired fibers, mainly of steel, are incorporated in the concrete mixtures, besides the necessary reinforcing bars. This reinforcement is present in higher volume fractions (1-2%) than the common fiber additions for reducing early age microcracking (3, 4). Fresh higher volume fraction steel-FRC mixtures attain stiff and very dry consistency in slump tests
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