Lesson Plans for Module 27303-14 PROPERTIES OF CONCRETE Module 27303-14 describes the properties, characteristics, and uses of cement, aggregates, and other materials that, when mixed together, form different types of concrete. The text covers procedures for estimating concrete volume and for testing freshly mixed concrete as well as methods and materials for curing concrete. Objectives Learning Objective 3 Learning Objective 1 • Describe the methods for testing concrete. • Identify various concrete ingredients and de- a. Describe the proper procedure for sampling scribe their purpose in a concrete mixture. concrete. a. Explain how portland cement affects a b. Explain the purpose of a slump test. concrete mixture and list the types of portland c. Describe how a concrete compression test is cement. performed. b. Describe the characteristics of aggregate used Learning Objective 4 in a concrete mixture. • Calculate concrete volume for rectangular or c. List the characteristics of water used in a circular structures. concrete mixture. a. Calculate rectangular volume. d. List types of concrete admixtures and b. Calculate circular volume. describe how they affect a concrete mixture. Learning Objective 2 Performance Tasks • Identify proper concrete mixture measure- Performance Task 1 (Learning Objective 3) ments and curing methods. • Perform a concrete slump test or create a con- a. Describe normal concrete-mix proportions crete test cylinder. and measurements. Performance Task 2 (Learning Objective 4) b. List special types of concrete. • Calculate concrete volume requirements using c. Describe the properties of air-entrained formulas, concrete tables, and/or concrete cal- concrete. culators, as applicable. d. Describe how concrete is cured. Teaching Time: 10 hours (Four 2.5-hour Classroom Sessions) Session time may be adjusted to accommodate your class size, schedule, and teaching style. Prerequisites Core Curriculum, Carpentry Level One, and Carpentry Level Two Before You Begin As you prepare for each session, allow sufficient time to review the course objectives, content, visual aids (in- cluding the PowerPoint® presentation), and these lesson plans, and to gather the required equipment and materi- als. Consider time required for demonstrations, laboratories, field trips, and testing. Using your access code, download the Module Examinations and Performance Profile Sheets from www.nccerirc.com. The passing score for submission into NCCER’s Registry is 70 percent or above for the Mod- ule Examination; performance testing is graded pass or fail. 27303-14 Properties of Concrete Module One i LP_M01_27303-14_Rev.indd 1 2/5/15 12:04 PM Safety Considerations This module requires that trainees work around cement. Safety is paramount in the carpentry trade and safe habits and practices must be emphasized whenever possible. Performance Tasks must be completed under your supervision. Each trainee must use required PPE and follow safe tool practices and procedures. Classroom Equipment Equipment and Materials for Laboratories and Materials and Performance Testing Whiteboard/chalkboard Personal protective equipment Samples of acceptable and Markers/chalk Eye protection unacceptable aggregates Pencils and paper Gloves Samples of admixtures Carpentry Level Three PowerPoint® Hard hat Samples of coloring agents Presentation Slides Construction calculator Samples of fine and/or coarse Computer Containers of water aggregate Copies of the Module Examination Copies of a completed concrete test Samples of portland cement and Performance Profile Sheets recording form Set of commercial construction Vendor-supplied videos/DVDs Copies of or excerpts from ASTM drawings showing concrete mixing operations C150, Standard Specification for Set of residential construction (optional) Portland Cement drawings TV/DVD player Copy of performance specifications Shovel Cylindrical molds Sieve or filter Digital thermometers Slide-rule concrete calculator Hand grips Slump cone mold Materials used for concrete hydration, Straightedge including waterproof curing paper, Tamping rod plastic sheeting, burlap mats, Tape measure blankets, and curing compounds Water Metal tags and tag wires Wheelbarrow Nonabsorbent surface Additional Resources and References This module presents thorough resources for task training. The following resource material is suggested for further study: American Concrete Institute. www.concrete.org ASTM C31, Standard Practice for Making and Curing Concrete Test Specimens in the Field, Latest Edition. West Conshohocken, PA: ASTM International. ASTM C33, Standard Specifications for Concrete Aggregate, Latest Edition, West Conshohocken, PA: ASTM International. ASTM C39, Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens, Latest Edi- tion. West Conshohocken, PA: ASTM International. ASTM C78, Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading), Latest Edition. West Conshohocken, PA: ASTM International. ASTM C138, Standard Test Method for Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete, Latest Edition. West Conshohocken, PA: ASTM International. ASTM C143, Standard Test Method for Slump of Hydraulic-Cement Concrete, Latest Edition. West Con- shohocken, PA: ASTM International. ASTM C150, Standard Specification for Portland Cement, Latest Edition, West Conshohocken, PA: ASTM International. ASTM C157, Standard Test Method for Length Change of Hardened Hydraulic-Cement Mortar and Concrete, Latest Edition. West Conshohocken, PA: ASTM International. ii NCCER – Carpentry Level Three 27303-14 LP_M01_27303-14_Rev.indd 2 2/5/15 12:04 PM ASTM C171, Standard Specification for Sheet Materials for Curing Concrete, Latest Edition. West Con- shohocken, PA: ASTM International. ASTM C172, Standard Practice for Sampling Freshly Mixed Concrete, Latest Edition. West Conshohocken, PA: ASTM International. ASTM C173, Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method, Lat- est Edition. West Conshohocken, PA: ASTM International. ASTM C231, Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method, Latest Edition. West Conshohocken, PA: ASTM International. ASTM C308, Standard Test Methods for Working, Initial Setting, and Service Strength Setting Times of Chem- ical-Resistant Resin Mortars, Latest Edition. West Conshohocken, PA: ASTM International. ASTM C403, Standard Test Method for Time of Setting of Concrete Mixtures by Penetration Resistance, Latest Edition. West Conshohocken, PA: ASTM International. ASTM C470, Standard Specification for Molds for Forming Concrete Test Cylinders Vertically, Latest Edition. West Conshohocken, PA: ASTM International. ASTM C494, Standard Specification for Chemical Admixtures for Concrete, Latest Edition. West Con- shohocken, PA: ASTM International. ASTM C595, Standard Specification for Blended Hydraulic Cements, Latest Edition, West Conshohocken, PA: ASTM International. ASTM C618, Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Con- crete, Latest Edition. West Conshohocken, PA: ASTM International. ASTM C666, Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing, Latest Edi- tion. West Conshohocken, PA: ASTM International. ASTM C1157, Standard Performance Specification for Hydraulic Cement, Latest Edition, West Conshohocken, PA: ASTM International. ASTM C1240, Standard Specification for Silica Fume Used in Cementitious Mixtures, Latest Edition, West Conshohocken, PA: ASTM International. ASTM C1315, Standard Specification for Liquid Membrane-Forming Compounds Having Special Properties for Curing and Sealing Concrete, Latest Edition, West Conshohocken, PA: ASTM International. ASTM D98, Standard Specification for Calcium Chloride, Latest Edition, West Conshohocken, PA: ASTM Inter- national. Cement Association of Canada. www.cement.ca Effect of Cement Characteristics on Concrete Properties. 2006. Portland Cement Association. Skokie, IL. Portland Cement Association. www.cement.org Properties of Concrete. 2011. A. M. Neville. Trans-Atlantic Publications, Inc. There are a number of online resources available for trainees who would like more information on the properties of concrete. A search for additional information may be assigned as homework to interested trainees. 27303-14 Properties of Concrete Module One iii LP_M01_27303-14_Rev.indd 3 2/5/15 12:04 PM LP_M01_27303-14_Rev.indd 4 2/5/15 12:04 PM Session Outline for Module 27303-14 PROPERTIES OF CONCRETE The lesson plan for this module is divided into four 2.5-hour sessions. Each session includes 10 minutes for administrative tasks and one 10-minute break. SEssION ONE SEssION THREE Session One introduces concrete ingredients Session Three introduces concrete volume and their impact on a concrete mixture. calculations. 1. Show Session One PowerPoint® presentation 1. Show Session Three PowerPoint® slides. presentation slides. 2. Introduce trainees to hydration and its 2. Introduce trainees to the proper technique for various stages. determining the volume of rectangular and circular solids. 3. Introduce trainees to the various types of aggregates and admixtures that may be used 3. Introduce trainees to the proper technique for in a concrete mixture. determining concrete volume. SEssION TWO SEssION FOUR Session Two introduces concrete mixture Session Four is a review and testing session. proportions, measurements, and concrete Have trainees complete the module Review testing.