EFFECTS OF COARSE AGGREGATE SIZES ON THE FLEXURAL STRENGTH OF CONCRETE. Ozioko, 2015 graded coarse aggregate in concrete matrix also has it share in the causes of structural failure due to the development of horny comb in the concrete. This also results in a cohesionless composite of concrete and steel with poor flexural bond.
In order to determine the effects of coarse aggregate size on the flexural strength of concrete, concrete beams were produced in accordance with BS 1881-108 (1983) and American Society for Testing of Materials (ASTM C293) with varying aggregate sizes 9.0mm, 14mm, 18mm, and 24mm, using a standard mould of internal dimension of 150 x 150 x 750mm for the reinforced concrete beam.
Jan 01, 2020· In the Table 10, the flexural strength of concrete values for conventional mix and coarse aggregates replaced with E-Waste plastic mix are given. The tests done for 7, 14 and 28 days shows that flexural strength of specimen with E-Waste plastic is lower than the conventional mix specimen.
flexural performance of the beams is discussed in terms of cracking and ultimate load capacity, load-deflection relationships, failure mode, crack pattern and ductility, as well as the mechanical properties of the concrete were studied. The test results show that using of Attapulgite as coarse aggregate and treating it by sodium
FLEXURAL STRENGTH OF CONCRETE-FILLED STEEL TUBULAR BEAM WITH PARTIAL REPLACEMENT OF COARSE AGGREGATE BY GRANITE Shehdeh Ghannam Department of Civil Engineering, Zarqa University, Zarqa, Jordan. ABSTRACT Composite members consists of steel and concrete have the advantages of both materials, steel
The proportion of fine aggregates, coarse aggregates and cement were estimated by determining the total volume of concrete required to cast nine (9) specimens for flexural strength and water absorption tests, the weight of cement, fine aggregate, coarse aggregate and water required per mix using a mix proportion of 1:1.5:3
In this research work the flexural behaviour of beams made of NCA, partially (25,50 and 75%) as well as fully replaced LCA was studied under two point loading in a Universal Testing Machine (UTM) of 1000kN capac ity. 2 MATERIALS USED . Portland Pozzolana Cement, Natural Coarse Aggregate (NCA) of maximum size 12.5 mm, fly ash based Lightweight
It is well recognized that coarse aggregate plays an important role in concrete. Coarse aggregate typically occupies over one-third of the volume of concrete, and research indicates that changes in coarse aggregate can change the strength and fracture properties of concrete. To predict the behavior of concrete under general
Average 28-day flexural strength of at least 4.5 MPa (650 psi) Coarse aggregate: nominal maximum size = 37.5 mm (1.5 inch), dry-rodded weight = 1600 kg/m 3 (100 lb/ft 3 ), specific gravity = 2.68, moisture content = 1.0 percent, absorption = 0.5 percent.
When natural coarse aggregates are replaced by recycled coarse aggregates, strength properties of concrete are decreased to some extent. The basic aim of this research was to investigate the effect of using recycled concrete pieces as coarse aggregate on flexural and tensile strength of concrete.
In order to determine the effects of coarse aggregate size on the flexural strength of concrete, concrete beams were produced in accordance with BS 1881-108 (1983) and American Society for Testing of Materials (ASTM C293) with varying aggregate sizes 9.0mm, 14mm, 18mm, and 24mm, using a standard mould of internal dimension of 150 x 150 x 750mm for the reinforced concrete beam.
Flexural MR is about 10 to 20 percent of compressive strength depending on the type, size and volume of coarse aggregate used. However, the best correlation for specific materials is obtained by laboratory tests for given materials and mix design.
Flexural strength or modulus of rupture is about the 10 to 20 % of compressive strength of the concrete and it depends upon the type, volume and size of coarse aggregate used in the concrete. Flexural strength test measures the indirect tension in concrete.
All beams exhibited a typical flexural failure mode. All Attapulgite beams produced sufficient predicted ductility (more than 3). Keywords:Attapulgite, flexural behavior, steel reinforcement ratios,treated lightweight aggregate. 1. Introduction The structural lightweight aggregate (coarse aggregate) is the aggregate with abulk density less than
The relation between the flexural strength of the concrete and the stress at which cracks first occurred in compression was independent of the type of coarse aggregate; no such unique relation existed between flexural strength and ultimate compressive strength. Tentative conclusions are drawn on the mode of failure of the concrete as follows.
Topçu and Şengel (2004) reported a 13% reduction in flexural strength when traditional coarse aggregate is replaced by 100% RCA. Xiao et al. (2005) reported that RCA could be used in structural members when the mix design and details of construction are properly maintained.
The proportion of fine aggregates, coarse aggregates and cement were estimated by determining the total volume of concrete required to cast nine (9) specimens for flexural strength and water absorption tests, the weight of cement, fine aggregate, coarse aggregate and water required per mix using a mix proportion of 1:1.5:3
Effect of Lightweight Aggregate on the Flexural Behaviour of Self Compacting Concrete Anand DEV BGa, Jayasree S. b. Abstract —Self-Compacting Concrete (SCC) is a flowing concrete mixture that is able to consolidate under its own weight. Density of all types of concrete depends on the coarse aggregate present in it.
Farid D et al [2] examined the possible use of crushed brick as coarse aggregate in concrete. The coarse aggregate was replaced with crushed brick aggregate by 25%, 50%, 75% and 100%. The author compared the flexural strength of concrete made with crushed brick to natural aggregate concrete and reported that 25% of natural coarse aggregate can
3. Flexural and Tensile Strength . ACI 55.1R reported that, flexural and tensile strength of concrete made from recycled coarse aggregates is less than conventional concrete by 10%, and this reduction increases to 20% in worst case scenario.
were used. The beams were tested for flexural strength after 28 days of casting and curing in water. Flexural strength results for the concrete and colcrete were compared. Results show that for the two mix ratios investigated, and the three types of coarse aggregates used, the flexural strength of colcrete is higher than that of concrete.
Coarse aggregate is one of the essential components of concrete and occupies the largest volume in the mix. That is why it greatly affects the concrete mix design. Its properties such as strength, maximum size, shape, and water absorption influence water demand, the quantity of cement and fine aggregate in concrete mixture. It is reported []
of 0, 20, 40, 60, 80, & 100 percent of natural coarse aggregates. Samples were cast to carry out split cylinder strength and flexural strength tests. Sieve analysis of coarse aggregates was carried out as per ASTM C136-06.The bulk specific gravity test for natural coarse aggregates was carried out conforming to ASTM C 127-81.
aggregate have openings ranging from 150 µm to 9.5 mm (No. 100 sieve to . 3 ⁄ 8. in.). The 13 standard sieves for coarse aggregate have openings ranging from 1.18 mm to 100 mm (0.046 in. to 4 in.). Tolerances for the dimensions of open-ings in sieves are listed in ASTM E 11 (AASHTO M 92). Size numbers (grading sizes) for coarse aggregates