3.1 Composite Materials

• Meaning of composite materials
• Identifying composite materials in the locality: concrete, bricks, manufactured boards, stone, papier-mâché and plastic-coated paper
• Composition of concrete and bricks
• Composition of manufactured boards
• Composition of stone, papier-mâché and plastic-coated paper
• Uses of composite materials in the work environment
• Importance of composite materials used in the locality

• identify composite materials in the locality
• describe the composition of composite materials in the locality
• relate composite materials to their use in a work environment
• acknowledge the importance of composite materials used in the locality

“How can composite materials be identified?”

“Why are composite materials used in day-to-day life?”

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1. What composite materials are
   40 min · 1 practice tasks · quiz
   Define a composite as two or more constituents combined on purpose, and start identifying the six Grade 8 examples in the locality.
2. Concrete: composition and local use
   40 min · 1 practice tasks · quiz
   Describe cement, sand, ballast and water as the constituents of concrete, and match the mix to floors, beams and tanks in the locality.
3. Bricks: composition and local use
   40 min · 1 practice tasks · quiz
   Describe clay bricks and cement blocks as shaped composites and match them to walls, latrines and stores in the locality.
4. Manufactured boards
   40 min · 1 practice tasks · quiz
   Describe plywood, chipboard and blockboard as wood-plus-adhesive composites and match them to doors, shelves and desktops.
5. Stone, papier-mâché and plastic-coated paper
   40 min · 1 practice tasks · quiz
   Describe the remaining three Grade 8 composites: stone used with mortar or recast, papier-mâché, and plastic-coated paper.
6. Uses and importance of composites
   40 min · 1 practice tasks · quiz
   Match the six composites to work-environment jobs and acknowledge why the mixes matter in Kenyan daily production.