Civil Engineering Reference
In-Depth Information
12
10
8
6
4
2
y
= 0.1098x + 0.6
R
2
= 0.4
0
0
10
20
30
40
50
60
70
Mortar Content (%)
Figure 4.5
Variations in the water absorption of RCA with mortar content.
water absorption than NAs. The variations in the water absorption of RCA
with mortar content for a variety of RCA samples reported in available
literature are summarised in Figure 4.5.
Available literature suggests that regardless of the properties of the par-
ent concrete, there is a relatively proportional relationship between the
mortar content and the bulk density (and water absorption) of the RCAs.
The water absorption and bulk density of RCA have been reported to
increase and decrease almost linearly, respectively, with an increase in
mortar content when considering RCAs produced from similar concrete
sources. However, when considering RCAs produced from various con-
crete sources, the linear proportionality of such relationships do not tend
to be as obvious because of the variations in the properties of mortar and
the NAs used in the parent concrete.
4.3.3 Toughness (abrasion and impact resistance)
Crushing strength, abrasion resistance, and elastic modulus of aggregate
are all interrelated properties that are greatly influenced by porosity [22].
“The abrasion and impact resistance of an aggregate is its ability to resist
being worn away by rubbing and friction or shattering upon impact. It is a
general measure of aggregate quality and resistance to degradation due to
handling, stockpiling, or mixing” [23, p. 17]. The resistance of aggregates
against degradation caused by the effects of abrasion, wear, and impact
is measured using the Los Angeles test (American Society for Testing
and Materials [ASTM] C 131 for aggregates between 2.36 and 37.5 mm
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