The present study involved assessing the replacement of fine aggregate in the mortar with sustainable local materials like clay bricks and glass included 168 specimens (cubes and prisms). Seven mixtures were cast for this work, one control mix (R1) with 100% natural sand whereas mixes from R2 to R5 have 10% and 20% replacing natural sand with waste clay bricks and waste glass separately and respectively. Mix R6 was included 20% replacing sand with combination waste materials (10% waste clay bricks with 10% waste glass). Mix R7 has involved the same percent of replacing the previous mix R6 but with adding Polypropylene fibers 1% by volume. The samples have put in an electrical oven for one hour at 200, 400, and 600 ᵒC then cooled to room temperature to be tested and compared with samples at normal temperature 24 ᵒC. Different mechanical tests were adopted involved flow tests, density, weight loss, compressive strength, flexural strength, and water absorption. The results at different temperatures were discussed where many findings were specified. The flexural strength at 400 ᵒC was showed improving by 56% for 20% waste clay brick and 69% with 10% waste glass, as well all combination mixes illustrated higher strength than the control. Doi: 10.28991/cej-2021-03091729 Full Text: PDF
In this paper Slurry Infiltrated Fiber Concrete (SIFCON) has been used at plastic hinge locations to fix the ductility problem of continuous reinforced concrete beams. The use of SIFCON in compression parts of plastic hinge zones for continuous beam has been experimentally studied under both static and repeated loads. Six continuous beams with full scale have been tested; two with normal concrete totally and four with SIFCON at compression parts of plastic hinge locations. Three fraction volumes of fibers (Vf) % have been considered, 7%, 9% and 11%. Also, the influence of using SIFCON parts on redistribution of bending moment for continuous beams is investigated. It was noticed that, in all the reinforcement concrete beams, the using of SIFCON increased the capacity and ductility of the samples at same time. The improvement in the flexural capacity, the toughness and the moment redistribution for continuous beams could reach as high as 20%, 20% and 104% respectively. In addition, it was found that the reduction in flexural strength of composite continuous beam when it exposures to repeated loads was about 0.6% in comparison with that under static loads.
This paper aims at studying the flexural behavior of continuous composite beams casting from normal concrete and Slurry Infiltrated Fiber Concrete (SIFCON) by using DIC (Digital Image Correlation) technique. The DIC results are compared with the standard methods measurement. DIC is a new non-contacting and non-destructive optical technique based on digital photographs for the tested area to compare them at different stages of loading. Tests were performed on three full-scale T-section continuous beam specimens subjected to two-point loads. In this paper, the effect of using SIFCON at compression or tension parts of plastic hinge locations on the flexural capacity, moment redistribution and crack width are investigated experimentally. The results indicate that the DIC technique gives very good correspondence comparing with the results recorded by standard methods measurement. In addition, it was found that the enhancement in moment redistribution ratio for the beam with SIFCON at compression parts of plastic hinge zones was significantly higher by about 38% comparing with the beam with SIFCON at tension parts of plastic hinge zones.
SIFCON is featured construction material has a high strength in addition to large ductility making it convenient for special structural applications. However, the SIFCON unit weight is higher than fibre reinforced concrete due to the heavy weight of the high steel fibre content. This paper aims to investigate the flexural behaviour of Modified Weight Slurry Infiltrated Fibre Concrete (MWSIFCON) by using combination of different types of fibres which are micro steel fibres, macro hooked end steel fibres and polypropylene fibres. For this purpose, 21 prisms and 84 cubes are casted. The volumetric ratios (7%, 4% and 3%) for micro steel fibres, macro hooked end steel fibres and polypropylene fibres respectively are used of each type alone for the purpose of comparison. Moreover, hybrid fibres from combination of two types of these fibres using 50% from ratios above of each type are used to investigate the flexure behaviour of prisms. The other related properties for resulted SIFCON are studied from cube tests. The results indicate that SIFCON of combination macro hook end steel fibres with polypropylene fibres gives a good density for SIFCON with 18.66 KN/m3 and performed adequate flexure strength with 8.09 MPa. Also, it has kindly reduced in the water absorption of SIFCON.
This analytical study aims to investigate the flexural behavior of simply supported RC beams having longitudinal hole with circle cross section under monotonic two point loads. The commercial FE program ABAQUS was used for simulating and implementing the specimens behavior that tested experimentally in previous researches. The overall specimens investigated were thirteen RC rectangular beam specimen, the first one was solid while the others with longitudinal circular hole. The specimens with holes divided into three groups, each one has a specified hole diameter 25 mm, 40 mm, and 50 mm. The distance from center of hole to the top section face was variable where the hole would be completely in the stress block, below it, or partially within it. The validity of the simulated model were verified by comparing the available load deflection data with the implemented one, where good agreement were noticed. The simulated models could introduce the ultimate load, first cracking load and its propagation in addition to the maximum attended deflection. It is concluded that the existence of a longitudinal hole with a percentage of diameter to beam depth ratio below 20% with different positions from top surface of the cross-section to the center of the hole values caused decreasing in ultimate load not exceeding 5% compared with the solid beam.
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