ASTM C827 PDF

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Please help us to share our service with your friends. Share Embed Donate. A number in parentheses parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the Department of Defense. These include shrinkage or expansion sio n due to hyd hydrati ration, on, set settlem tlement ent,, eva evapor poratio ation, n, and oth other er physical physi cal and chemica chemicall ef effects.

The values stated in each system may not be exa exact ct equ equiva ivalen lents; ts; the theref refore ore,, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. These notes and footnotes shall not be considered as requirements of the test method.

Referenc Referenced ed Documents Documents 3. Terminology 2. Curren Cur rentt edi editio tion n app approv roved ed Jun Junee 15, Pub Publis lished hed Jul July y Ori Origin ginall ally y approved in Last previous edition approved in as C—01a DOI: Changes in height are measured and expressed as a positive or negative change in the height of a test specimen that is restrained from lateral movement.

However, the specimen used in this test method is not completely unrestrained so that the measurements are primarily useful for comparative purposes rather than as absolute values. In this system, the relay lens is located nearer the test specimen and has a focal length of Three sizes of molds are used in this test method with heights of , , mm [4, 6, 12 in. The mm rod shall be used with paste, grout, and mortar. The mm rod shall be used with concrete.

Protect the test specimen from heat from the light source and limit air movement Note 1. Test Specimen 6. Plastics Corp. For cementitious mixtures containing aggregate that will not all pass through a 4. For concrete mixtures having particles retained on the Fresh materials shall be used to make each trial. For premixed mortars or grouts, use the amount of water suggested by the manufacturer for the intended application. The consistency should be determined and the values recorded for all tests.

Calibration 7. Locate the test equipment and specimens on a surface substantially free of vibration during the test. If desired, use a single projected light source for both test specimens with duplicate magnifying lens systems and indicating charts. Darken the room, illuminate the projected light source, and place the dummy test specimens preferably hardened test specimens in the light beam before each of the magnifying lens systems. Then reposition the indicating chart so that the indicating ball image falls on the zero line.

Molding Specimens 9. Fabricate mm [in. Procedure 8. Preparation of Mixtures Remove pieces of large aggregate directly under the indicator balls, and repeat the procedure. Then tap the outer side of the molds lightly three times so that the indicator balls can adjust to their own natural displacement level in the mixture.

Position each specimen between the projected light source and the magnifying lens system. Adjust the position of the test specimens horizontally until the images of the indicator balls on the indicating charts are sharp and clear.

Reposition the indicating charts so that the indicating ball images fall on the zero lines. Record this time as the start of the test. Record ambient air temperature and humidity.

During the test, carefully place additional drops of oil on the test specimen surface by an eyedropper or other suitable means, taking care not to touch the indicator ball. Place all the mixing water in the mixing bowl prior to introduction of the other materials for the batch. Measurements may be continued after hardening, if desired. NOTE 7—Automated recording of time and height is permitted as long as requirements for precision and accuracy are met Calculation Precision and Bias Therefore, results of two properly conducted tests by the same operator on the same material should not differ by more than 0.

Therefore, results of two properly conducted tests by the same operator on the same material should not differ by more than 1.

Report Report all change in height and time readings from the start of the test to conclusion, as percent versus time. Show the average of the data as a smooth curve.

Calculate the maximum change in height using the largest indicating chart reading obtained during the test period and report as increase or decrease. In the event that both increase and decrease result, report the maximum change in height. Data were from tests of specimens 4 in.

Keywords Approved June 15, 1 Revised the standard as a dual units test method. Permission rights to photocopy the standard may also be secured from the ASTM website www. Please fill this form, we will try to respond as soon as possible.

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ASTM C827/C827M

Historical Version s - view previous versions of standard. More C It is particularly applicable to grouting, patching, and form-filling operations where the objective is to completely fill a cavity or other defined space with a freshly mixed cementitious mixture that will continue to fill the same space at time of hardening. It would be appropriate to use this test method as a basis for prescribing mixtures having restricted or specified volume change before the mixture becomes hard.

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A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Yield, and Air Content Gravimetric of Concrete 1. These include shrinkage or expan- C Test Method for Air Content of Hydraulic Cement sion due to hydration, settlement, evaporation, and other Mortar physical and chemical effects. It is the C Practice for Preparing Precision and Bias Statements responsibility of the user of this standard to establish appro- for Test Methods for Construction Materials priate safety and health practices and determine the applica- C Test Method for Time of Setting of Hydraulic Cement bility of regulatory limitations prior to use. Mortar by Modified Vicat Needle 1.

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This test method covers the determination of change in height of cylindrical specimens from the time of casting until the mixture is hard. If desired, this test method can be adapted to studies of changes in height involving different time schedules or other environmental treatment from the standard procedures prescribed by this test method. These include shrinkage or expansion due to hydration, settlement, evaporation, and other physical and chemical effects. The user may want to define this age as the time when a companion specimen of the same batch has reached the time of final setting by Test Method C paste , C mortar or grout , C concrete , or establish a predetermined age in minutes from the time the specimen is cast as the defined age to record the final measurement.

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A A number number in in parenthes parenthes es es indicates indicates the the year year of of last last reappro reappro val. This This standard standard has has been been approved approved for for use use by by agencies agencies of of the the Department Department of of Defense. These These include include shrinkage shrinkage or or expan- expan- sio sio n n due due to to hyd hyd rati rati on, on, set set tlem tlem ent ent , , eva eva por por atio atio n, n, and and oth oth er er. The The valu valu es es stated stated in in. Co Co mbining mbining values values from from the the two two systems systems may may result result in in non-confo non-confo rmance rmance with with the the standard. It It is is th th e e responsibility responsibility of of the the user user of of this this standard standard to to esta esta blish blish appro- appro- priate priate safety safety and and health health practices practices and and determine determine the the applica- applica- bility bility of of regulatory regulatory limitations limitations prior prior to to use. These These notes notes.

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