Lightweight Concrete for High Strength - Expanded Shale & Clay

Table 3.3 Mean Modulus of Elasticity (psi) and Poisson Ratio Results for Mixes A, B, and C
ACC
ASTM
Mix
Time
(days)
16 hrs. 1 56 56
A Elasticity 3,530,000 3,670,000 4,020,000 4,390,000
A Poisson 0.1738 0.1869 0.1851 0.1942
B Elasticity 4,080,000 4,330,000
B Poisson 0.1817 0.1876
C Elasticity 4,080,000 4,250,000 4,240,000 4,330,000
C Poisson 0.1827 0.1881 0.1848 0.1895
Test Age
(days)
Table 3.4 Modulus of Rupture Values (psi) for Mixes A, B, and C
Mix A Mix B Mix C
ACC ASTM ACC ASTM ACC ASTM
1 649 761 670 678 645 678
56 1,077 1,030 1,164 1,006 926 918
3.2.3 Coefficient of Thermal Expansion
The CTE was tested at 56 days of age. For Mix A, 8,000 psi mix, the CTE was 5.34 x 10 -
6 / o F. For Mix C, 10,000 psi mix, the CTE was 5.28 x 10 -6 / o F. These values agreed with values
in a paper by Daly (2000). In the paper, Daly lists CTE values for lightweight concrete ranging
from 4.44 x 10 -6 / o F to 7.22 x 10 -6 / o F. Values for high-strength normal weight concrete ranged
from 5.1 x 10 -6 / o F to 5.5 x 10 -6 / o F in a paper by Shams and Kahn (2000).
3.2.4 Chloride Permeability
Chloride permeability was determined using 4x8 cylinders, ASTM C 1202 (AASHTO
T277). The results are shown in Table 3.5; they show that all mixes had a very low permeability.
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