Lightweight Concrete for High Strength - Expanded Shale & Clay

3.2.1 Compressive Strength
Figure 3.5 illustrates the strength gain of ACC versus ASTM cured 4x8 cylinders. The
6x12 cylinders were stronger than the 4x8 cylinders at ages of 16 hrs. and 1 day, while the 4x8
cylinders were stronger at the 56 days of age. The 4x8 cylinders had an average compressive
strength 4 % higher than the 6x12 cylinders. At 56 days, ASTM 4x8 cylinders were 5 % higher
than the ASTM 6x12 cylinders, and the ACC 4x8 cylinders were 2 % higher than the ACC 6x12
cylinders.
12,000
11,000
Compressive Strength (psi)
10,000
9,000
8,000
7,000
6,000
Mix A accelerated cure
Mix A ASTM cure
Mix B accelerated cure
Mix B ASTM cure
Mix C accelerated cure
Mix C ASTM cure
0 10 20 30 40 50 60
Time (days)
Figure 3.5 Average Compressive Strengths for Mix A, Mix B, and Mix C
3.2.2 Modulus of Elasticity & Modulus of Rupture
Modulus of elasticity was measured using 6x12 inch cylinders, and the results are given
in Table 3.3. Modulus of rupture tests used a 4x4x14-inch prism under four point bending, and
the results are given in Table 3.4
3-5