Strength of cement concrete mainly depends upon:
Try it first: pick an option, then read the explanation.
Correct answer: D. Water-cement ratio
What Does Concrete Strength Mainly Depend On?
By Abrams’ water–cement ratio law (1919), the compressive strength of fully compacted concrete is governed principally by the water–cement (w/c) ratio. Lower w/c ratios produce a denser paste with fewer capillary pores, giving higher strength. This law applies when the concrete is properly placed and compacted — excess water simply remains as capillary pores, weakening the matrix.
While cement quality, aggregate quality, and curing all influence strength, the w/c ratio is the primary controllable parameter in mix design.
Strength mainly depends on the water–cement ratio — option D.
Key takeaway
Lower w/c → fewer pores → higher strength. Abrams’ law is fundamental to all mix design methods.