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CIV2235 - Structural materials - S2 2026
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Concrete must be cured for at least ...
Which of the following statements is wrong about concrete bleeding?
After casting, an ordinary cement concrete on drying ...
What is the mechanism for bleeding of fresh concrete?
A possible solution to reduce bleeding is ...
For compacting plain concrete road surface of thickness less than 20 cm, we use ...
Which one of the following statements is true regarding the workability of fresh concrete?
Air temperature 23 °C; relative humidity 50%; concrete temperature 30 degC; wind speed 20 km/h
(i) Draw in the following figure and determine rate of water evaporation. Please upload your drawings below.
(ii) The maximum evaporation rate is 1.0 kg/m2/h. What is the maximum wind speed allowed if the other parameters remain unchanged?
(ii) The maximum evaporation rate is 1.0 kg/m2/h. What is the concrete temperature allowed if the other parameters remain unchanged?
Why does bleeding occur within concrete? Mention three adjustments you would make to the concrete mix proportions to reduce it?
Why compaction is needed for concrete? List at least three types of compaction.