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STP 208-4

Standard Test Section:CEMENT TREATED SOILS

Procedures Manual Subject: COMPRESSIVE STRENGTH

Date: 1993 12 15 Page 1 of 3

1. SCOPE1.1. Description of Test

This method describes the procedure for making and curing compression test specimens

from cement treated soils for determining the compressive strength of the specimens.

2. APPARATUS AND MATERIALS2.1. Equipment Required

101.6 mm mold. A cylindrical metal mold with a nominal capacity of 950 cm3 andinternal diameter of 101.6 mm and a height of 116.3 mm. The mold will be fitted with a

detachable collar and base plate.

Rammer. A metal rammer having a 50.8 mm diameter circular face with a 2.5 kilogram

weight which will drop freely for a distance of 305 mm.

Compaction base. A cube of concrete weighing not less than 45 kg.

Straight-edge. A steel straight-edge approximately 300 mm in length.

Balance. A balance sensitive to 0.1 g.

Sampling Equipment. Pans, trowel, scoop, 500 ml graduated cylinder, saran wrap,scarifier and tape.

Capping Compound. Plaster of Paris having a compressive strength greater than theanticipated strength of the specimen. The capping compound will be prepared and appliedto form a plane uniform surface at right angles to the axis of the cylinder.

Curing Equipment. A moist storage cabinet or room capable of maintaining 100%humidity and room temperature.

Testing Machine. The testing machine shall be equipped with two steel bearing blockswith hardened faces. One bearing block shall be spherically seated and the other rigidly

mounted. The testing machine shall be accurate within a tolerance of 1.0 percent of the

compressive strength of the specimen.

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Standard Test Procedures Manual STP 208-4Section: Subject:

CEMENT TREATED SOILS COMPRESSIVE STRENGTH

Page: 2 of 3 Date: 1993 12 15

3. PROCEDURE3.1. Sample Preparation

Sample preparations and testing procedures will be followed in accordance with spec. STP208-3 and will include the following amendments.

Two compacted specimens nearest to optimum moisture of moisture density curve will be

retained. After density-moisture calculations these compacted specimens will be used for7 day compressive strength tests.

Determine moisture contents of specimens on trimmings after compaction.

Each of the three layers will be scarified during compaction to improve the bond between

the layers.

Place specimens retained for compressive strength testing in curing box provided in field

lab. After curing for two days in moist box, specimens will be wrapped with saran wrap

and packed with moist sawdust in the wooden box provided and shipped to Central Lab.

Store the specimens at room temperature in an atmosphere of approximately 100 percent

humidity until the day of testing.

Cap specimens and soak in water for four hours before being broken.

Place the specimen in the machine and slowly bring the blocks to bear on the specimen

without shock until failure occurs.

Operate the machine at a constant rate of load of 135 KPa per second. This is equivalentto 20 lbs. per sq. inch per second.

4. RESULTS AND CALCULATIONS4.1. Reporting Results

Report the maximum pressure in KPa at failure on form MR-84.

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Standard Test Procedures Manual STP 208-4Section: Subject:

CEMENT TREATED SOILS COMPRESSIVE STRENGTH

Date: 1993 12 15 Page: 3 of 3

5. ADDED INFORMATION5.1. General

Compaction of molds must be completed as soon as possible after sampling to prevent

rapid hydration.

Extreme care must be taken when handling the soil cement specimens after compaction to

prevent distortion of the specimen when they are in the "green" state.

All specimens must be clearly identified and all test results included when the samples are

shipped to Central Lab.

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Standard Test Procedures Manual STP 208-4Section: Subject:

CEMENT TREATED SOILS COMPRESSIVE STRENGTH

Page: 4 of 3 Date: 1993 12 15

APPROVAL SHEET

New Revision X Date of Previous Document 85-04-01

Effective Date: - -

Description of Revision (Reason for Revision): Format of test procedure updated.

Review/Implementation Process:

Reviewed by the Materials Section of the Technical Standards and Policies Branch.

Other Manuals/Policies Affected:

Nil

Follow Up/Training Required:

Nil

Comments/Concerns/Implications (Budget/Environment/Stakeholders):

Prepared and Recommended by D. MacLeod 93-12-15

Materials Standards Engineer Date

Approval Recommended by R.A. Widger - - Senior Materials Engineer Date

Approval Recommended by A.R. Gerbrandt - - Dir., Technical Standards & Policies Br. Date

Approved by D.G. Metz - -

Assistant Deputy Minister, Infrastructure Date

Electronic File Updated - -Update Mailed - -