Mechanical Properties Of Normal Concrete Research Articles

Influence of Hybrid Steel –Polypropylene Fibers on the Mechanical Properties of Normal Concrete

Influence of Hybrid Steel –Polypropylene Fibers on the Mechanical Properties of Normal Concrete

Experimental Investigation on Mechanical Properties of Normal Concrete Reinforced with Discarded Steel Fibres

Experimental Investigation on Mechanical Properties of Normal Concrete Reinforced with Discarded Steel Fibres

Influence of steel slag and steel fibers on mechanical properties of normal concrete

Cement, water, and both fine and coarse aggregate make up the composite material known as concrete. It is more versatile than the other building materials and has a variety of uses. However, it is brittle in nature and weak in tensile strength. Concrete also has low impact strength and poor energy absorption. Steel slag and steel fibres are added to the concrete to strengthen the weak spots and create a sustainable mix, and green concrete is created. In this study, concrete is mixed with hook-end steel fibres at concentrations of 0.25%, 0.50%, 0.75%, and 1% by volume, and its mechanical properties are assessed and compared with conventional concrete having 20 % replacement with slag. It was observed that adding hooked-end steel fibres to concrete enhanced its mechanical properties. The required number of cubes were cast, and the M40-grade concrete was then put through compressive, split tensile, and shear tests. The mechanical characteristics of concrete that have changed as a result of the addition of steel fibres were then compared.

Mechanical properties of normal concrete for local road pavement using plastic waste substitution as course aggregate

Plastic waste can decrease the carrying capacity of the environment, only about 4% can be recycled. Through research, it is expected to be one of the solutions to the use of plastic waste to reduce environmental impacts. The use of substitution of plastic waste as coarse aggregate in the weight-volume mixture with proportion of 2%, 4%, 6%, 8% and 10% in normal concrete used for local roads and determining the mechanical properties are the aims of this research. The results showed that the compressive strength for reference concrete was 21.268 MPa greater than designed (fc = 19.3 MPa) and with a mixture of plastic waste respectively 13.298 MPa, 14.430 MPa, 11.506 MPa, 6.602 MPa, 6.602 MPa 6.602 MPa and 5.753 MPa. The tensile strength of the reference concrete is 2.853 MPa, and compared with substitution of 1.981 MPa, 2.216 MPa, 1.863 MPa, 1.155 MPa and 1.179 MPa. The flexural strength test below and do not meet the criteria for the local roads (3 MPa). Plastic waste up to 10% substitution shows the lowest decrease with 4% plastic waste resulting in 19.5% decrease in flexural strength compared to reference concrete and every 2% increase plastic was 10-20% flexural strength decreases.

Concentric compressive behavior of hybrid concrete–Stainless Steel Double-Skin Tubular Columns incorporating High Performance Concretes

This paper investigates experimentally and numerically concentric compressive behavior of hybrid concrete–Stainless Steel (SS) Double-Skin Tubular Columns (DSTCs) employing High Performance Concretes (HPCs). DSTCs can be prefabricated using outer-and-inner double tubes positioned concentrically sandwiching the concrete core in-between. However, the ordinary steel tubes beside the poor mechanical properties of Normal Concrete (NC) may not be appropriate for the environmental attack. This research proposes employing two durable SS tubes sandwiching HPCs in-between to gain satisfied performance. Beside NC, three types of HPCs were suggested: Engineered-Cementitious Composites (ECC), High-Strength Fiber-Reinforced Concrete (HSFRC) and High-Strength Concrete (HSC). Forty specimens were tested experimentally under axial monotonic compressive loading up to failure. The main variables were: void ratio created by inner tube, concrete core type and vertical stiffeners embedded in the concrete core. Parallel to those implemented experimentally, nonlinear three-dimensional Finite Element Models (FEMs) were set-up, executed and validated against experimental outcomes generating an accepted model with about 6% error. Results revealed that the studied parameters could significantly enhance the behavior in terms of load–displacement response, elastic/plastic appearance, ultimate capacity, and capturing ductile failure mode. Finally, both experimental and numerical results were extended deriving new formula could estimate the ultimate capacity with difference about 12%.

The effect of fishbone fiber and rice husk ash additive on the mechanical properties of normal concrete

Concrete is a material that strong in holding compression force but weak in holding tension force so reinforcement is needed to prevent cracks in the pull region. Tuna bone fibers work as reinforcement, which is expected to overcome the problem of brittle concrete and produce ductile concrete. To improve concrete performance, fibers and additives are used. Tuna bone fibers and rice husk ash additives were selected to be able to utilize local natural materials. The purpose of this study is to examine the mechanical properties of normal concrete, which include compressive strength and tensile strength, by adding fiber and ash additives. The percentage of fibers added is 0%, 0.5%, 1%, and 1.5% of volume of concrete, and the percentage of additives is 0%, 10%, and 15% of weight of cement. Compression tests were performed to a total of 90 pieces of objects at 7, 28, and 56 days of age. Split tensile tests were performed to a total of 60 pieces of objects at the 28 and 56 days of age. The maximum compressive strength at 7, 28, and 56 days of age are 31.45 MPa, 36.81 MPa, and 41.16 MPa, respectively which were produced by variation BNS1 (BN+fiber 0.5%). The maximum tensile strength at 28 and 56 days of age are 4.08 MPa and 4.12 MPa; respectively which were produced by variation of BNS2 (BN+fiber 1%). All specimens at 7, 28, and 56 days of age produce concrete compressive strength on average 20 MPa of concrete above so that it is categorized into structural concrete.

Effecting of Steel Fibers and Fly Ash on the Properties of Concrete

In this research, the effect of the addition of fly ash particles with different weight ratios of 15%, 20%, and 25% as well as the addition steel fibers with different volume fractions of 0.25%, 0.75%, and 1.25% on the mechanical properties of concrete (compressive strength and modulus of rupture) was studied. To carry out this research, ten concrete mixes were prepared, one of which is the reference normal concrete (without any additives), the others contain steel fibers and fly ash as additives with the mentioned volumetric and weight proportions. For each type of concrete mix, three standard 150×300 mm cylinders and three standard prisms 100×100×500 mm were casted, water to cementing material ratio was fixed for all concrete mixes (W/cm = 0.435) and the superplasticizer was used with ratio of 0.98%-1.22% by weight of the cementitious material in mixtures that contain steel fibers and fly ash particles as a partial replacement of cement weight. The results showed that the addition of fly ash particles had little effect on the mechanical properties of normal concrete, while the steel fibers had the greatest effect. The highest increase in compressive strength and flexural strength compared with reference concrete was 61.60% and 78.84%, respectively in the volume fractions 1.25% of steel fiber.

Sifat Mekanis Beton Normal dengan Campuran Tepung Marmer

This study is describe about the mechanical properties of normal concrete by adding of marble flour based on the mixed plan made. The compressive strength of the planned test object fc '20.0 and fc' 30.0 MPa was prepared by using the ACI method. The addition of marble flour in a concrete mixture varies from 0%, 5%, 10%, 15%, 20% and 25% to the weight of the cement used. Concrete test specimens were made in the form of cylinders 15.0 cm in diameter, 30.0 cm in height and made in the form of concrete beams measuring 15.0 cm x 15.0 cm x 75.0 cm, the type of mechanical testing performed in the form of compressive strength tests on cylindrical specimen, split tensile strength test on cylindrical specimen and flexure test on beam specimen. Curing is done by immersion technique at 25ºC and the test is done when the concrete is 28 days old. The test results show that the addition of marble flour to the normal concrete mixture can increase its mechanical properties by 26% for compressive strength, 24% for split tensile strength, and 17% for flexural strength.

Effect of Elevated Temperature on Mechanical Properties of Waste Polymers Polyethylene Terephthalate and Low Density Polyethylene Filled Normal Concrete Blocks

Thermal properties of M30 normal concrete block (NC) were compared with concrete filled with waste poly ethylene terephthalate and waste low density polyethylene aggregates which were used as partial replacement of sand in the production of concrete blocks (plast-cretes). Tests were carried out using 100mm×100mm Cubes and 100mm×200mm Cylinder for Compressive and Split tensile Test respectively. The mechanical properties of normal concrete and plast-crete were studied and compared over two temperature regimes at 100°C-400°C and 400°C-800°C. The compressive and Split Tensile strength of normal concrete increased slightly from 100°C-400°C, and reduced from 400°C-800°C. However, the compressive and split tensile strength of the plast-crete showed a gradual reduction from 100°C-400°C and this continued from 400°C-800°C, and became more pronounced as the percentage of waste plastics in the plast-crete increased. The percentage of weight loss for the normal concrete increased from 100°C-400°C, this increase continued from 400°C-800°C. The plast-crete also showed an increase in the percentage weight loss for both temperature regimes and the percent weight loss became more pronounced as the percentage of waste plastics in the plast-crete increased. The normal concrete showed greater spalling than the plat-cretes. Even with the slight reduction in strength with increasing temperature, Plast-cretes can still be applied in areas where low temperature and minimal load bearing applications are needed such as fancy blocks, pedestrian walk ways, slabs, partition walls, fences, houses and light traffic structures.

Experimental Study on Mechanical Properties of Steel and Polypropylene Fiber-Reinforced Concrete

The mechanical tests of normal concrete (NC) specimens, steel fiber reinforced concrete (SFRC) specimens and polypropylene fiber reinforced concrete (PPFRC) specimens have been carried out. Fiber-reinforced concretes containing different volume fraction and aspect ratio of steel and polypropylene fibers were compared in terms of compressive, splitting tensile, ultimate tensile properties. Test results indicate that the mechanical properties of NC can be improved by addition of steel fibers and can be enhanced with the increase of fiber content. However, polypropylene fiber may cause opposite effect, if volume fraction too high.