What is the use for concrete? - Foundations, Floor Slabs, Walls and pre cast products., What is the ratio of concrete? - 1:2:3 Cement:sand:gravel, Mixtures with low portland cement content - Harsh concrete and slabs 2. bleed excess water to the surface 3. difficult to finish 4. poor surface characteristics, Too much Portland cement can result in? - Increased drying and shrinkage., What does workability mean - Shaped and formed into a mould., What is workability determined by? - Amount of water and aggregates contained in the concrete mix., What is the test for determining the workability of concrete? - Slump Test,

Lesson 15

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