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Precautions while applying cement mortar

Short answer

Use fresh cement, clean sand, and potable water; measure proportions by volume correctly. Dry-mix first then add water on a clean platform and use within 30 minutes. Wet bricks or surfaces beforehand, keep joints thin and uniform, and cure with water for 7-10 days, avoiding extreme weather.

What precautions are to be taken (things to be considered) before/while applying ordinary cement mortar in construction?

Precautions before and during the application of cement mortar:

  1. Materials: use fresh cement of the right grade (not lumpy), clean sharp sand free from silt, clay and organic matter, and potable water.
  2. Proportions: measure the proportions by volume correctly, for example 1:3 to 1:6 as required by the job.
  3. Mixing: mix dry first, then wet, on a clean, watertight platform; mix thoroughly until the colour is uniform. Do not use too much water.
  4. Time: use the mortar within about 30 minutes of adding water; do not re-temper mortar that has started to set.
  5. Surface preparation: clean and wet the masonry surface (soak the bricks in water) so it does not suck water from the mortar; rake out the joints so plaster adheres well.
  6. Joint thickness: keep the joints uniform and thin (about 10 mm), and fully filled with mortar, with no hollows.
  7. Alignment: check levels, plumb and lines while laying.
  8. Curing: keep the work wet for at least 7 days (10 days for plaster); protect it from sun, wind, rain and frost in the early days.
  9. Weather: avoid working in hot, dry or freezing weather without proper care.

✓ Answer checked by Claude Opus 5.5 (high effort)

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