1. Poor Mix Ratios
Many block makers use too much sand and not enough cement in their mix. While this reduces costs, it results in blocks that lack strength and durability. A weak cement-to-sand ratio means the block can’t hold together under stress and absorbs water more easily.
2. Inadequate Curing
Cement blocks need to be kept moist for at least 7 days to harden properly. Unfortunately, in many cases, blocks are sold or used within a day or two of being made. Without proper curing, the blocks remain brittle, fragile, and porous.
3. Over-reliance on Manual Production
In small-scale block yards, blocks are often made with hand-mixed batches and low-pressure moulding. This results in uneven compaction, air gaps, and inconsistent quality — some blocks may look fine, but break apart easily when used.