6 tensile strength of cement
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The document summarizes a laboratory experiment to determine the tensile strength of cement. Mortar samples were created with a 1:3 mix of cement and sand, and tested after 1 day. The tensile strength was calculated by dividing the failure load by the cross-sectional area. The results were then compared to Iraqi standard specifications to determine if the cement passed requirements for its tensile strength after 1 day.
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6 tensile strength of cement
- 1. University of Salahaddin/ College of Engineering 2015-2016 Dept. Of Dams & Water resources Engineering By: Goran Adil Test No. 6 Test Name: Tensile strength of cement. Introduction: Cement is very weak in tensile strength. Its strength is determined directly using the briquettes. Purpose: To find the tensile strength of the cement. Materials: 1- Ordinary Portland cement. 2- Standard sand ( Rounded single size particles passed on sieve 850 µm (No.20) and not more than 10% pass through sieve 600 µm (No.30) ). 3- Water. Apparatus: 1- Cement tensile strength machine. 2- Briquettes, the thickness of the briquettes is 25.4 mm and the minimum area of its cross section is 645 mm2 . 3- Balance. 4- Container. 5- Hand gloves, Trowel, and Scoop. 6- Glass Graduates. Procedure: 1- Prepare cement-sand mortar, with a mix proportion 1:3 and water to both weights of cement and sand ratio of 8 %. Use 50 grams of cement. 2- Mixing cement and sand at dry condition for one minute then add the water and continue the mixing for 4 minutes. 3- Oiling the internal faces of the mould. 4- Place the mould on the sheet of glass and fill it with a mortar. 5- Strike surface of the paste in a mould by a spatula until full compaction has achieved. 6- Level the surface of the mortar. 7- Store the moulds in air under temperature about 20±1o C and a minimum relative humidity of 90 %, for 24±0.5 hour. 8- Open the moulds and take out specimen. 9- Testing the specimens which has the shape No. 8, using direct tension testing machine. 10- Apply the load until the failure of specimen and record the failure load. Calculation: Tensile strength of cement A p MPa. Where: P = failure load (N). A = sectional area of the specimen (mm2 )
- 2. University of Salahaddin/ College of Engineering 2015-2016 Dept. Of Dams & Water resources Engineering By: Goran Adil Specification: Iraqi standard specification 5/1984 Age 1 day Tensile strength of rapid hardened cement (MPa) 2.1 Discussion: - Compare the test results with the standard specifications. - What is the significance of this test?
- 3. University of Salahaddin/ College of Engineering 2015-2016 Dept. Of Dams & Water resources Engineering By: Goran Adil Data Sheet Tensile strength of cement Test No.: 6 Test name: Tensile strength of cement Name of the student: Group No.: Date: Group No. Age day Failure load N Tensile strength MPa Results: