Maricopa Community Colleges  CON206   19972-20046 
Official Course Description: MCCCD Approval: 10/22/96
CON206 19972-20046 LEC 1 Credit(s) 1 Period(s)
Troubleshooting Concrete Problems
Diagnosing problems in concrete. Problems and corrective action related to mix, preparation and placement, finishing, and those encountered with hardened concrete. Causes and preventative measures for problems associated with the construction of concrete walls. Prerequisites: (Indentured status with the Arizona Concrete Contractors Association and CON202) or permission of the apprenticeship coordinator.
Go to Competencies    Go to Outline
 
MCCCD Official Course Competencies:
 
CON206   19972-20046 Troubleshooting Concrete Problems
1. Describe common concrete problems associated with the concrete mix and corrective actions. (I)
2. Describe concrete problems caused by improper preparation and placement. (II)
3. Explain the causes and corrective actions for concrete problems that arise during the finishing process. (III)
4. Describe the causes and corrective actions for problems encountered with hardened concrete. (IV)
5. Explain the type of problems encountered when constructing concrete walls and describe prevention methods. (V)
Go to Description    Go to top of Competencies
 
MCCCD Official Course Outline:
 
CON206   19972-20046 Troubleshooting Concrete Problems
    I. Mixture
        A. Calcium chloride
        B. Entrained air
        C. Air -detrainer
        D. Excessive water
        E. Retarders
        F. Pozzlan
        G. False-setting
        H. "Hot" concrete
        I. Aggregate size
        J. Plastic shrinkage cracking
      II. Preparation and Placement
          A. Wire reinforcement
          B. Heating pipes
          C. Slope for drainage
            1. Sidewalks
            2. Driveways
          D. Surface tolerances
            1. Floors
            2. Residential slabs
          E. Vacuum processing
          F. Vapor barriers
        III. Finishing
            A. Blisters
              1. Cause
              2. Prevention
            B. Joints
              1. Sidewalk
              2. Floor toppings
              3. Floor-to-wall
              4. Sawed
              5. Sealants
            C. Rain damage
            D. Floor finishings
          IV. Hardened Concrete
              A. Blow ups
              B. Bond loss to toppings (delamination)
              C. Cold joints
              D. Corrosion of reinforcing steel
              E. Shrinkage cracks
                1. Floors
                2. Walks
                3. Effects of reinforcing steel
              F. Crazing
              G. Curling
              H. Damp floor slabs
              I. Discoloration
              J. Dusting
              K. Popouts and pitting
              L. Scaling and spalling
              M. Slippery surfaces
                1. Skid-resistant overlays
                2. Rough surface finishing
                3. Surface grooving
              N. Strength variations
                1. Air entrainment
                2. High temperatures
              O. Subgrade support
              P. Thin slabs
              Q. Low wear resistance
                1. Curing
                2. Aggregates
            V. Concrete Walls
                A. Cracks
                  1. Shrinkage
                  2. Jointing
                  3. Settlement
                  4. Vibration
                B. Preventative measures
                  1. Correct mix
                  2. Appropriate jointing
                  3. Proper placement procedures
                  4. Uniform soil support
                  5. Careful backfilling
            Go to Description    Go to top of Competencies    Go to top of Outline