As can be seen, multicem concrete showed resistance below the limit for structural lightweight concrete, which can be classified so as insulating concretes or moderate resistance. However, according to Radonjanin, Malesev, Marinkovic and Al Malty (2013), concrete made from 100% recycled coarse aggregate can achieve high compressive strength since large amount of cement to be added, which is therefore not an economical proposition. Still according to the author, concrete made with 50% or 100% of recycled coarse aggregates requires a reduction of 4% to 10% of the ratio a / c of 5% to 10% more cement than the conventional concrete to give it same compressive strength at 28 days of conventional concrete. For the lightweight concrete produced, the
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The production process and the recycled aggregates can also contribute to disintegration and additional internal fragmentation. It may be noted also that in addition to removing the mortar adhered to, this process modifies the final shape of the recycled aggregates. Thus, it is clear that depending on the amount adhered mortar in recycled aggregate, these can have very different properties to the aggregates natural (Rashad, …show more content…
The test was performed with three samples of 0.5 kg after each these pass by homogenisation and a greenhouse at a temperature of 40 ° C ± 5 ° C. According to NBR NM 248/2003, through this test one can determine the characteristic maximum dimension of the aggregates, namely the nominal mesh opening sieve normal or intermediate range in which the aggregate has a percentage retained accumulated immediately below or equal to 5% by mass. It is also possible to obtain aggregates fineness modulus corresponds to the sum of percentages retained accumulated mass of an aggregate in the series of sieves Normal divided by 100. The particle size below is 80% which is of the total weight of the material. It is one of the parameters used to characterise it. In the D 80 were used the particle sizes below which lie 10%, 50% and 90% by mass, or is, D 10 , D 50 and D 90 , respectively. Another parameter was not the coefficient uniformity (CNU). The higher the value, the greater the grain band and present highest rated is the material. Furthermore, when the non-coefficient uniformity is less than 2, it can be said that the material has a uniform particle size (Tosic, Marinkovic, Dasic and Stanic, 2015). This shows the calculation of the coefficient of
The production process and the recycled aggregates can also contribute to disintegration and additional internal fragmentation. It may be noted also that in addition to removing the mortar adhered to, this process modifies the final shape of the recycled aggregates. Thus, it is clear that depending on the amount adhered mortar in recycled aggregate, these can have very different properties to the aggregates natural (Rashad, …show more content…
The test was performed with three samples of 0.5 kg after each these pass by homogenisation and a greenhouse at a temperature of 40 ° C ± 5 ° C. According to NBR NM 248/2003, through this test one can determine the characteristic maximum dimension of the aggregates, namely the nominal mesh opening sieve normal or intermediate range in which the aggregate has a percentage retained accumulated immediately below or equal to 5% by mass. It is also possible to obtain aggregates fineness modulus corresponds to the sum of percentages retained accumulated mass of an aggregate in the series of sieves Normal divided by 100. The particle size below is 80% which is of the total weight of the material. It is one of the parameters used to characterise it. In the D 80 were used the particle sizes below which lie 10%, 50% and 90% by mass, or is, D 10 , D 50 and D 90 , respectively. Another parameter was not the coefficient uniformity (CNU). The higher the value, the greater the grain band and present highest rated is the material. Furthermore, when the non-coefficient uniformity is less than 2, it can be said that the material has a uniform particle size (Tosic, Marinkovic, Dasic and Stanic, 2015). This shows the calculation of the coefficient of