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Final results show a marked increase of revenues with Emeritus® units with respect to a dry unit.
The latter material can therefore be produced using standard methods familiar to the construction industry with a dry unit weight of 18.50 kN/m3, which in turn leads to self weight reduction of 15 20% and the associated decrease in the structure's overall cost, hence, providing a feasible challenge to normal weight concrete (NWC).
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It had an optimum moisture content of 7.8%, a maximum dry unit weight 19.62 kN/m3.
It is found that under the same freezing condition, there is a critical dry unit weight, γdcr, in terms of freeze thaw for some of the engineering properties.
To be classified as LWSCC, a mix should satisfy EFNARC-SCC industrial classifications as well as it should develop a minimum 28-day compressive strength of 17.2 MPa and attain an air dry unit weight of less than 1,840 kg/m3 (ACI Committee 213R 2003).
In general, the addition of either quick or hydrated lime resulted in a decrease in the maximum dry unit weight and a slight increase in the optimum moisture content as shown in Figs. 7 and 8. Apparently, hydrated lime treated specimens exhibited higher dry unit weight than that achieved with quick lime addition.
There is an increase in optimum moisture content (OMC), and a decrease in the maximum dry unit weight (MDD) with an increase in lime content.
This, along with changes in the particle size distribution, caused a decrease in maximum dry unit weight [21, 23].
A decrease in the dry unit weight may be due to the lower specific gravity of the SDA, while an increase in the optimum moisture content may be as a result of water needed to be hydrated.
Generally, use of fine and coarse ESH lightweight aggregates in mix proportioning yielded concretes with a 28-day air dry unit weight of less than 1,840 kg/m3, classifying them as LWSCC.
With increase in SDA content a general reduction in maximum dry unit weight was observed.
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