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Table 4 Mortar test plan.

From: Laboratory Investigation into the Flexural Behavior of Embedded Concrete Sleepers in Two-Stage Concrete with Preplaced Ballast Aggregate

Parameters Test type
Compressive strength (ASTM C109/C109M, 2013) Flexural strength (ASTM C78/C78M, 2018; ASTM C348, 2014) Fluidity test (ACI304.1-R-92, 1997)
Cement content (kg/m3) 750 800 850 750 800 850
Age (day) Number of constructed specimens Number of tests on fresh mortar  
w/c
0.35 0.4 0.35 0.4 0.35 0.4 0.35 0.4 0.35 0.4 0.35 0.4
1 3 3 2 3 4 3 Impossible 4 Impossible 3 3 4
3 4 3 4 4 4 4
28 3 3 3 4 3 3