Lab Report on Reinforced Concrete Design
In this laboratory experiment, we were required to produce a concrete mixture based on the BRE Manual Design of concrete mixtures which is attached to this report. It is then used to produce concrete cubes and prisms.
The objective of this experiment is to learn the methods of producing concrete and concrete characteristics as well as comparing the theoretical values of the concrete’s Young’s Modulus with experimental values.
Procedure for concrete mix:
A concrete mix was designed based on the BRE Manual Design of concrete mixtures. Then, a total of 40kg of the required proportions of Ordinary Portland cement which includes water, fine aggregate, and 20mm size crushed gravel coarse aggregate was weighed out. The materials …show more content…
Ec(t)=4n2L2ρ × 1015 (kN/mm2)
Where L = 500mm n = first natural resonant frequency (Hz)
The static modulus Ecm is determined using Eurocode 2 equation:
Ecm=Ec(t)1.05 (kN/mm2)
The direct static method is:
Ecm=22 ((fck+8)/10)0.3 (kN/mm2) fck = 0.8 fcu (N/mm2)
The Flexural Tensile Strength of the prisms is calculated by using the formula:
Where P= Failure load a= Breadth, Depth & Shear Span of prism
Calculations are tabulated in table 3.1 & 3.2: Test  Prism  ρ (kg/m3)  V (m/s)  n (Hz)  Ec(t) (kN/mm2)  Ecm (kN/mm2)  Deviation (%)  Pundit  Air cured  2282  3851.83    28.21  26.87  13   Water cured  2339  3563.67    24.75  23.58  12  Erudite  Air cured  2282    2.33  12.42  11.82  156   Water cured  2339    3.87  35.09  33.42  19 
Table 3.1: Modulus of prisms using Pundit and Erudite Tests
Test  Ecm (kN/mm2)  Air cured cylinder  11.85  Water cured cylinder  10.56 
Table 3.2: Static modulus for air and water cured cylinders
Average values of Ecm six cases above = 19.68 kN/mm2
Difference with theoretical values = 32% less
Sieving Results: Fine aggregate  Weight (kg)  Percent retained  Percentage passing  Pan lid  0  0%  100%  10mm  0  0%  100%  5mm  0.002  0%  100%  2mm  0.019  4%  96%  1.18mm  0.041  8%  87%  600μm  0.128  26%  61%  300μm  0.187  38%  23%  150μm  0.078  16%  7%  Base  0.034  7%  0%  Total 

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