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Holly Holevinski Cement + water = paste Aggregates: Coarse (>1/4”) Fine (<1/4”)

Concrete Background. Holly Holevinski Cement + water = paste Aggregates: Coarse (>1/4”) Fine (<1/4”) Reinforcement (rebar) Fiberglass, plastic, steel Add mixtures: reduce weight Air-entrainment Foaming materials Accelerators and retarders. Concrete Background. 5 types of cement

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Holly Holevinski Cement + water = paste Aggregates: Coarse (>1/4”) Fine (<1/4”)

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  1. Concrete Background Holly Holevinski Cement + water = paste Aggregates: Coarse (>1/4”) Fine (<1/4”) Reinforcement (rebar) Fiberglass, plastic, steel Add mixtures: reduce weight Air-entrainment Foaming materials Accelerators and retarders

  2. Concrete Background • 5 types of cement • Types I – V • Type I- General use • Type IV- “High Early” • Reaches its maximum strength within 24 hours • Window when paste is moldable ~90-120 minutes • 3000 psi goal for slab

  3. Concrete Background • Concrete Tips: • Concrete cannot go below 80% RH during cure process • Rebar should not touch any open areas • Use plastic to keep moisture in, spray concrete regularly if possible • Mix parts of Portland cement with cheap substitutes (fly ash, silica fume, rubber pellets) • Concrete must be at least 30% Portland cement

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