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To investigate the uniaxial compressive behavior of the granite under high strain rates, three groups of specimens with the same aspect ratio (0.5) but different …
The aim of this study is to understand the strength behaviour and fragment size of rocks during indirect, quasi-static and dynamic tensile tests. Four rocks with different lithological characteristics, namely: basalt, granite, sandstone, and marble were selected for this study. Brazilian disc experiments were performed over a range of strain rates from ~ …
Context 1 ... by the Ghana Standards (GS: 297-1:2010) shown in Table 2 were used to compare the individual compressive strength of the blocks. Class A-For external use, …
In Ghana, the rocks which are commercially crushed for use as coarse aggregates in concrete production include quartzites, gneisses, migmatites, granites and granodiorites. The use of granites and granodiorites for concrete production is common in the middle …
The dynamic compressive strength factor for the granite was less than 1; for the basalt, 1.35; for the limestone, 1.52; and for the tuff, 1.7^-« The compressional wave velocity of rock is affected by increases in both the applied axial stress and confining pressure. Velocities recorded in the direction of applied
Slump, compressive and indirect tensile strength tests were performed on fresh and hardened concrete.28 days Peak compressive and indirect tensile strength values of 40.70N/mm2 and 2.30N/mm2 ...
GHACEM cement developed the highest 28th day compressive strength of 30.96 N/mm2 and CIMAF cement the lowest strength of 25.89 N/mm 2 . In the 42.5R group, DANGOTE had the
Ghana. E-mail: [email protected] 2zakari.mustapha1967@gmail ... 14, 21, and 28 days to determine their compressive strengths. Quartzite was found to have the highest average compressive strength of 24.48N/mm 2 with an average density of 2160kg/m 3, while compressive strength of crushed granite was 22.01N/mm 2 with an …
The compressive strength and durability performance of the DHSBs were in-vestigated through laboratory experiments. The durability of the DHSBs was assessed through water absorption and abrasion tests. The 28-day compres-sive strengths of T-DHSBs and R-DHSBs were found to be 3.58 Mpa and 4.04
For the compressive strength test, moulds of 225 × 225 × 450 mm of 40% void were used to produce compressive test samples [9] and a total of 60 samples were produced altogether. The mortar was mixed manually in the ratio of 1:6 (one part cement and six part sand) ratio as shown in Table 1 and water cement ratio of 0.5 was kept …
In the present study, an attempt has been made to study the effect of mica on different engineering properties. Here, the percentage of mica by weight adopted for different test procedures are 2%, 4%, 6% and 8%. Direct shear test, standard Proctor test, CBR test and compressive strength test were conducted by percentage replacement of locally ...
From the test results, it was obtained that the average compressive strength and flexural strength of synthetic beams were 1.52 – 2.53 MPa and 0.61 – 0.95 MPa, respectively. Synthetic beams ...
of 128 concrete cubes were cast and their compressive strengths of RHAC in comparison with Conventional Concrete (CC) assessed. 2.1. Material Source and Preparation Rapid Hardening Portland cement produced by Ghana Cement with 28-day strength of 42.5N/mm 2 was used. River sand and crushed granite were the ag-gregates used.
In this study, seven grain size ranges of granite fines were used: 415 - 3.35mm, 3.35 - 2.36mm. 2 36 - 1.70mm, 1.70 - 1.18mm, 1.18 - 0.30mm, 0.30 -0.063mm …
The study aims at determining the pHs of the six different sources of water used for the concrete specimen and ascertain the influence of the water sources on their compressive strengths. The ...
Abstract Shock wave fracturing is a novel technology in coalbed methane (CBM) exploitation. Understanding dynamic damage and failure mechanisms of rock with different grain sizes is of vital importance to shock wave fracturing. In this study, we investigate the influence of grain size on the dynamic compressive strength and failure …
The compressive strengths of each brand w ere determined at ages of 7days, 14day s, 21days an d 28days b y following GB/T 50081(2002) standard r equirements. A load- factor of 10kN was applied ...
between strain hardening and softening is called the unconfined compressive strength of the rock and is denoted as Co or qu. Failure takes place continuously from C to D during which ... Granite Basalt Gneiss Schist Quart-zite Marble Lime-stone Sand-stone Shale Av. Co Max. Co Min. Co Range No. of samples 181.7 324.0 48.8 275.2 26 214.1 358.6 ...
4. Compressive and tensile strengths of the concrete increased with increase in percentage of granite fines in the mix and with the curing age. 5. The 28-day compressive and tensile strengths of PKSC were 14.70 N/mm2 and 1.90 N/mm2 respectively at granite fines contents. 6.
compressive strength test. On the 14th day another 3 samples of "S" and "Q" cubes were respectively selected again for the second category test. The last category test was carried out on the 28 th day with the remnant "S" and "Q" cubes respectively, for their compressive strengths. The basic principle underling this test is the ...
The targeted compressive strength of the concrete at 28-day of curing was 20 N/mm2. Plain concrete cubes and beams were prepared with a mix ratio of 1:1.5:3 by weight and 0.6 water-cement ratio. A ...
European Geology 58,2015 With increasing temperature up to 300 °C the uniaxial compressive strength of Patrik Granite increased by 81% (Fig. 8). On the other hand, at 600 °C the compres- sive ...
concretes were tested for compressive strength at 3, 7, 14, 21, and 28 days. Three cubes were crushed using the compressive testing machine and the average taken as the compressive
The compressive strength of granite (depth = 1377–2002 m) taken from GPK-1 (see Fig. 1 for location) was found to range between 120 and 485 MPa at a confining pressure of 40 MPa (Rummel 1992), and uniaxial compressive strength (UCS) values between 100 and 130 MPa are reported for unaltered granite from Soultz-sous-Forêts in …
Young's Modulus, Tensile Strength and Yield Strength Values for some Materials. Young's Modulus (or Tensile Modulus alt. Modulus of Elasticity) and Ultimate Tensile Strength and Yield Strength for materials like steel, glass, wood and many more. Sponsored Links.
The compressive strengths of the site-produced concrete were 26–60% less than the minimum 28-day characteristic compressive cube strength of 25 MPa required for structural use in buildings in Ghana. If an appropriate water content had been used at the sites, the compressive strengths could have still been less than the specified 25 MPa …
Based on the experiment conducted, it can be concluded that for the C15 (1:2:4) and C20 compressive strength as per IS 456:2000, Ordinary Portland Cement Brand E and G of …
In Ghana, however, proper utilization of wastes from woodworking operations has attracted but little attention and is not well documented while lateritic material naturally abounds. ... compressive & tensile strengths: Granite fines replaced lateritic soils: Laterized concrete: Ife-Ifewara, Osun State, Nigeria [47] Cement + Sand + Laterite ...
The results show that the optimum artificial network developed in this research predicts the unconfined compressive strength of weak to very strong granites (20.3-198.15MPa) …
compressive strength were 57.5%, 68.1%, 83.7%,and 87.3% respectively. The results of the study indicate that both the density and compressive strength of concrete decreased as the percentage replacement increased but replacement of sand by sawdust produced a higher percentage reduction in compressive strength than in density.
The cubes were cured for 28 days and tested for compressive strength. The 28-day compressive strength of the concrete samples were 15.0, 6.9, 5.7, and 1.5 MPa for …
