cube strength

cube strength

In a test of the strength of portland cement, the load per unit area at which a concrete cube (of standard size) fails when tested in a specified manner.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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The reduction in compressive strength with increasing in the amount of polypropylene grains can be attributed to the tiny voids created within the concrete matrix by the presence of the fluffy polypropylene grains, these voids were filled with water when the concrete was wet, and this also contributed to the high water cement ration of 0.75 that was used and the eventual low cube strength of 19.07 N/ mm2 obtained for the control sample.
The estimated cube strength ([f.sub.est.cube]) was calculated by applying the following equation (1) in BS 6089:1981 [20]:
The estimated cube strength was compared to concrete mark from design drawings to verify if the columns and beams were built in accordance with the drawings.
The average cube strength of the four different batches were determined as 32.6 N[/[mm.sup.2], 32.5 N/[mm.sup.2], 21.63 N/[mm.sup.2] and 0.88 N/[mm.sup.2] respectively, as shown in Table 4.
Notations [A.sub.c] Cross-sectional area of concrete, [A.sub.s] Cross-sectional area of steel, b Internal breadth of the section, [b.sub.f] External breadth of the section, D External depth of the section, h Internal depth of the section, [f.sub.ck] Characteristic strength of concrete, [f.sub.cu] Characteristic 28-day cube strength of concrete, [f.sub.y] Yield strength of structural steel, [M.sub.u(the)] Ultimate theoretical moment of resistance, [M.sub.u(exp)] Ultimate experimental moment resistance, [M.sub.u(pla)] Ultimate plastic moment of hollow steel section, t Thickness of steel section, y Depth of neutral axis, [Z.sub.p] Plastic section modulus of the steel beam.
The increase in the cylinder and the cube strength was found to be as high as 15.37% and 9.85% compared to the plain concrete when silica fume was used; however, the addition of metakaolin increased the cube and cylinder compressive strength as 14.13% and 14.83%.