CSM Exam 2 Questions & Answers

CSM Exam 2 Questions & Answers Portland Cement Concrete - ANS-concrete Asphaltic concrete - ANS-asphalt Concrete mixture - ANS-portland cement+aggregate+water Hydration - ANS-cement combines with water to form crystals Concrete mix ratio - ANS-1 cement: 3 fine and coarse sand: 4 aggregate Products formed from cement and water reaction - ANS-Calcium silicate hydrate, Calcium hydroxide, and Calcium sulfoaluminate hydrate Concrete cubic foot - ANS-12"x12"x12"; 150 pounds Concrete cubic yard - ANS-3'x3'x3'=27 cubic feet; 4,050 pounds Slump - ANS-the effect of water addition on strength of concrete; from greater to less Setting - ANS-hardening Curing - ANS-controlling the setting by preventing moisture from the concrete for the first week Honeycombing - ANS-Failed consolidation and air pockets around the aggregate Bird bath - ANS-low spot in the concrete Scalding/Spalling - ANS-Flaking-off of weak thin top layer caused by too much water at the surface; can be caused by over-consolidation Formword - ANS-wood or aluminum; ribbon Concrete boom truck - ANS-expands the discharge chute Exposed aggregate - ANS-Washed and brushed while setting; can be acid washed Porous (Pervious) Concrete - ANS-Mixed from cement and uniform coarse aggregate, no sad, less water, stiffer mix, reduces flooding in roadways, less strength PCA - ANS-Portland Cement Association: set standards for PC ACI - ANS-American Concrete Institute: set standards for concrete CRSI - ANS-Concrete Reinforced Steel Institute: set standards for steel in concrete ASTM - ANS-American Society of Testing and Materials: set standards for testing and material properties for all types of materials (NOT JUST CONCRETE) Slab on grade - ANS-A concrete surface, lying upon, and continuously supported by, the ground beneath Suspended or Structural Concrete Slab - ANS-A slab that spans between intermediate lines or points of support Proof rolling - ANS-A heavy roller or loaded dump truck makes multiple passes over the subgrade Capillary Break or Drainage Layer - ANS-Crushed rock or gravel placed over the subgrade; narrowly or uniformly graded particle sizes provide void space conducive to good drainage Edge forms - ANS-Strips of wood or metal are placed to contain the concrete pour; wood, rebar, or bracing; don't want to change slope Isolation/Expansion Joints - ANS-Allow unrestrained expansion and contraction of the slab Insulation - ANS-Reduce heat losses through the slab Vapor Retarder or Moisture Barrier - ANS-A heavy plastic sheet or other impervious material provides additional protection against subgrade moisture; important when slab will receive moisture-sensitive finishes Reinforcing - ANS-Bars or WWM is placed at the mid-slab depth to resist cracking due to thermal stresses Concrete placement - ANS-Concrete is placed as close as possible to its final deestination Striking off/Screeding - A...