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The minimum compressive strength obtained was 33.9 MPa, which is accepted as satisfactory for many structural applications.
Recommendations regarding both the minimum compressive strength of concrete for housing and the time for removing the formwork are also proposed.
The optimal mix contained 10.91% cement and 11.40% water which resulted in an average compressive strength of 15.15 MPa; ASTM C90 mandates a minimum compressive strength of 13.79 MPa.
The results showed that considering mechanical properties, the 100% natural coarse aggregates' replacement would be possible when RCA were produced from original concrete with a minimum compressive strength of 60 MPa.
However, while minimum compressive strength were measured as 28.5 N/mm2 on the concrete samples prepared with 0% (Reference samples) chemical additives the maximum water absorption were measured as 5.9% on the same samples.
Similar to internally cured concrete, the IC4 condition resulted in minimum compressive strength for control samples (Fig. 6).
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The aim of this paper is to optimize the ratio of three effective factors for foamed concrete production including cement mass, water and foam volume in order to achieve minimum density and maximum compressive strength along with minimum cost.
Moreover, several mixes have met the minimum Illinois Department of Transportation compressive strength requirements.
Different control concrete mixtures using ordinary Portland cement (OPC) with a minimum design compressive strength of 40 N/mm2 were prepared.
It is found that the optimum thickness values that make both heat transfer minimum and compressive strength maximum are 40 mm and 20 mm for the EPS and pumice blocks, respectively.
Nevertheless, these reactions could be time-consuming at ambient temperatures, demanding lengthy curing periods to reach a minimum unconfined compressive strength – qu ≥ 1.3 MPa and 2.1 MPa, to be employed in constructing walls of habitations and base/sub-base of pavements, respectively.
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