CE 200L Report 3_PCC

3. Procedure: First Period — Designing the Desired Portland Cement Concrete Mix a) Following the American Concrete Institute ( ACI ) method of portland cement concrete ( PCC ) mix design, a PCC mix is designed to meet the requirements and conditions de- scribed on the final page of this report. b) The mix designed is scaled down from one cubic yard to a sufficient amount of PCC to conduct the slump test. Second Period — Batching and Mixing the Designed Portland Cement Concrete ( PCC ) Mix, and Preparing the PCC Test Specimens The above-listed references ( ASTM C 143 , ASTM C 39 , ASTM C 496 , and CE 200 Student Notes and Workbook ) are read, and, additionally, the instructions given during the briefing period are adhered to when following the steps below: a) The portland cement concrete ( PCC ) mix for the team is designed, using the American Concrete Institute ( ACI ) method of PCC mix design. b) The designed mix for the PCC is mixed in the laboratory. c) The slump of the PCC is measured and recorded. d) The PCC is molded into two cylinders, to be moist-cured for 28 days, and all equipment used is washed and stored, work area is cleaned. e) The data sheet is initialed by the instructor. Third Period — Failing the Portland Cement Concrete Test Specimens e) Twenty-eight days later, the cylinders are removed from their curing environment, their diameter and height are measured and recorded. f) One PCC cylinder is capped and tested in compression to determine the PCC ƒ ′ c , and the other is tested in tensile splitting to determine the T . g) The relevant results from the compression and tensile splitting tests are recorded. h) The failed cylinders are sketched in order to show the failure modes. i) The failed cylinders are discarded as instructed, and work areas are cleaned. – 2/10 –

6. Tabulated Data and Results (Typed) Important Note: Tables in section 6 will be shared on the Google Spreadsheet. Teams must fill their Recorded and Computed values into the tables within one week from the day tests were performed. Incorrect values or late submissions will lose points for this section. a) PCC Cylinder Compressive Strength Test Data and Results Team Cylinder Dimensions Specimen Failure Data ACI Mix Design Actual Test Results N o h  Cyl. Cross. Area Load Time to Failure Slump w /c ƒ ′ c Slump ƒ ′ c (in) (in) (in 2 ) (lb) (s) (in) ( lb / lb ) (psi) (in) (psi) 1 2 3 4 b) PCC Cylinder Tensile Splitting Strength Test Data and Results Team Cylinder Dimensions Specimen Failure Data Design Actual N o h  Cyl. Cross. Area Load Time to Failure Slump w /c T s * Slump T s ** (in) (in) (in 2 ) (lb) (s) (in) ( lb / lb ) (psi) (in) (psi) 1 2 3 4 * The design T is calculated from the design ƒ ′ c by the following equation: T = 6.7 × √ ƒ ′ c ** The actual T is calculated by using the equation: T = 7. Plotted Data 2 P π× D × h – 5/10 –

c) If the direct tensile strength of PCC is 25 % less than its tensile splitting strength, calculate for your team the: ( i ) Direct tensile strength, and ( ii ) Ratio of direct tensile strength to compressive strength d) For your team: ( i ) Whether or not there is any deviation from the procedures pre- scribed in: • ASTM C 143 — “Standard Test Method for Slump of Hydraulic-Ce- ment Concrete” • ASTM C 39 — “Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens” • ASTM C 496 — “Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens” ( ii ) If so, what those deviations are. e) Address the acceptability of the test results by responding to: ( i ) Whether or not such deviations affect test results ( ii ) If yes, how such deviations affect test results ( iii ) Reasons why the test results could be considered acceptable, or why they should be rejected – 8/10 –