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Mortar Test Report

The document describes procedures for testing the compressive strength of cement mortar cubes according to ASTM standards. It lists materials and equipment needed, including scales, molds, mixers, a flow table, and a testing machine. The procedure describes mixing the mortar, determining its flow, molding test cubes, and compressing the cubes at 7 days. The results met ASTM specifications but testing at additional ages was not possible. Running more complete tests in the future was recommended.

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Muhd Farid
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3K views3 pages

Mortar Test Report

The document describes procedures for testing the compressive strength of cement mortar cubes according to ASTM standards. It lists materials and equipment needed, including scales, molds, mixers, a flow table, and a testing machine. The procedure describes mixing the mortar, determining its flow, molding test cubes, and compressing the cubes at 7 days. The results met ASTM specifications but testing at additional ages was not possible. Running more complete tests in the future was recommended.

Uploaded by

Muhd Farid
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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References

1. 2. 3. 4. ASTM C109 Compressive Strength of Hydraulic Cement Mortars ASTM C778 Specification for Standard Sand ASTM C150 Specification for Portland Cement ASTM C305 Mechanical Mixing of Hydraulic Cement Pastes & Mortars of Plastic Consistency 5. ASTM C230 Specification for Flow Table for Use in Tests of Hydraulic Cements 6. http://www.durhamgeo.com/testing/concrete/mortar-testing.html

Apparatus & Materials


Scale (2000 g) Specimen Molds Mixer, Mixing Bowl, Mixing Paddle, & Scraper Flow Table and Flow Mold Tamper Trowel Testing Machine, Forney 400 kip testing machine Graded Standard Sand - Natural silica sand, form Ottawa, Illinois, conforming to the requirements of ASTM Specification C778. Portland Cement per ASTM C150 Mold Release Agent

Procedure
1) Place all the mixing water in the bowl. 2) Add the cement to the water; then start the mixer and mix at slow speed (140 rpm) for 30 s. 3) Add sand slowly over a 30 s period, while continued mixing at slow speed. 4) Stop the mixer, change to medium speed (285 rpm), and mix for an additional 30 s. 5) Stop the mixer and let the mortar stand for 1.5 minutes. During the first 15 s, quickly scrape down into the batch any mortar that may have collected on the side of the bowl; then for remainder of the interval, cover with the lid. 6) Finish mixing for 1 minute at medium speed (285 rpm). 7) Determine flow of mortar as follows: a) Wipe table clean and dry and place flow mold at center. b) Place a layer of mortar about 1 inch thickness in the mold and tamp 20 times. c) Then fill the mold and tamp this second layer 20 times. d) Cut mortar flush with top of mold with a trowel, held perpendicular to the mold, using a sawing motion. e) Wipe table around mold clean of all mortar and dry; then remove mold. f) Drop table through inch height 25 times in 15 s. g) Use calipers to measure the diameters along the 4 scribed lines on the table. The sum of the four readings is the flow (the percent increase in the original diameter). Record this flow value. 8) Following flow test, return all mortar to the mixing bowl. Scrap down the sides and remix for 15 s at medium speed (285 rpm). Molding Test Specimens - Start molding within 2 minute and 30 s after completion of the original mixing of the mortar.

Statement of Test Results


We were unable to test the mortar cubes at 1, 3, and 28 days. If we would have been able to test at the other days listed, we would be able to plot up the data and see how the strength increases with time. The data we achieved from the 7 day tests meet the ASTM C150 specifications of 2200 psi.

Conclusion
The cement mortar cubes that were prepared and tested in lab sufficiently met the ASTM C150 specifications. I would have liked to have ran the 1, 3, and 28 days tests to see the strength-time relationship we would have achieved. I would recommend having volunteers run the tests if the classes are not in lab to get the data.

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