The study deals with the effect of using Slurry infiltrated fiber concrete (SIFCON) with the reinforced concrete beams to explore its enhancement to the flexural capacity. The experimental work consists of the casting of six beams, two beams were fully cast by conventional concrete (CC) and SIFCON, as references. While the remaining was made by contributing a layer of SIFCON diverse in-depth and position, towards complete the overall depths of the built-up beam with conventional concrete CC. Also, an investigation was done through the control specimens testing about the mechanical properties of SIFCON. The results showed a stiffer behavior with a significant increase in load-carrying capacity when SIFCON used in tension zones. Otherwise high ductility and energy dissipation appeared when SIFCON placed in compression zones with a slight increment in ultimate load. The high volumetric ratio of steel fibers enabled SIFCON to magnificent tensile properties.
Tensile plate specimens with dimension of 450×100×40mm were cast with 3D glass fabric having three different thicknesses 6, 10 and 15mm to measure their tensile strength. Plates with one and two layers of chicken wires, as well as micro steel fiber of 0.75% volume fraction were tested under tensile for comparison with references plates. Cement mortar with 61.2MPa cube compressive strength at 28 days was designed for casing the plates. The results indicated that after cracking of the mortar the textile reinforcement adds a strain hardening trajectory, that cause failure to occurs at slightly higher load and a higher strain. The improvement in tensile strength at 28 days ranged between 5 to 30%, and for 90 days between 5 to 60% for the three types of fibres used. Based on the results a significant increase was indicated with micro steel fiber.
This research studied the hybridization influence of polyvinyl alcohol (PVA), in the first stage as solution and the second added fibers with PVA solution. Performance under flexural loads of cement mortar composite was studied on this basis, PVA concentration in solution used was 1% of cement weight with three PVA fiber volume fraction (1%, 2% and 3%)which were considered as the variables for constant PVA solution to cement ratio (P/C) and w/c ratio as1.6% and 30% respectively. This paper is specially concentrating on the impact of fiber volume fraction contents and their metis to deform composite. The specimens were tested under one-point load test next two days wet curing and 26daysdry curing. The testes exhibited both ductility and flexural strength of cement matrix increased when the fiber volume fraction content increased. Combination only PVA fibers with the cement mortar composite showed softening in strain behaviors, whereas its performance is brittle for PVA solution-containing specimens, but mixture of PVA fiber with PVA solution to the cement mortar composites showed strain hardening performance. PVA fibers and solution in both surface properties (hydrophilic and / or hydrophobic nature) and chemical composition improved area under the curve of the reinforced cement mortar composites at 2% volume friction of PVA fiber with PVA solution about 197%, 29% and 9.6% compare with 1%, 3% volume friction of PVA with PVA solution and 2% without solution respectively. The addition 2% of PVA fibers increased about 44% flexural strength compare to the control specimens at flow diameter 190mm and 63% compare with 3% at flow diameter130 mm. It is given away that a uniform spreading of fibers through the bulk of the composite material is vital to its outstanding workability. Finally, it was observed fraction of PVA fibers plays as a result a significant role for refining ductility of cement mortar composites.
This paper investigates durability of no fine concrete containing demolished concrete as coarse aggregate after crushing to different sizes. Different no fine concrete mixes were considered using Portland cement type I with two types of coarse aggregates, crushed demolished concrete and crushed natural gravel were used with two ratios by weight (1:5 and 1:7) C/Agg. Graded aggregate and single size were used with a maximum size of 20 mm. W /C ratio was kept as 0.4 for all mixes and super-plasticizer was required to keep the same flow and compaction factor value for all mixes. Cube specimens with 150mm were cured and divided to two parts, the first part was exposed to 60 cycles of freezing- thawing; the second part of the sample was immersed in Nitric Acids solution with pH of 3.5 for (7, 28, 90 and 180 days) and then tested for compressive strength. The results indicated that it is possible to produce homogenous and workable mixes by using demolished crushed concrete as coarse aggregate. The compressive strength after cycles of freezing- thawing and immersing in Nitric acid (HNO3) at (7, 28, 90 and 180) days was decreased for samples made with crushed demolished concrete. Also it is found that the performance of concrete mixes containing graded coarse aggregate and 1:5 cement/aggregate ratios was better than other mixes.
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