Development of a Recommended Practice for Use of Controlled Low-Strength Material in Highway Construction (2008) / Chapter Skim
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Appendix B - Recommended Test Methods for CLSM
Appendix B - Recommended Test Methods for CLSM
Pages 94-109
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From page 94... ...
, except for tests for which no standard test methods exist, which is designated in Table B-1 as "No standard." Tests shown in group D are methods that the research team believes may have potential as standard CLSM methods, but the methods were either not included in the investigation or were not studied in enough detail to give adequate guidance. For instance, the researchers performed only limited testing using CBR, resilient modulus, and triaxial shear methods.
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From page 95... ...
Summary of CLSM test methods. Group Properties/Characteristics Test Methods Descriptions Sampling ASTM D 5971 A Flow ASTM D 6103 Existing standard test methods Setting/hardening AASHTO X 1 (modified ASTM C 403)
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From page 96... ...
Change Section 12 of ASTM C 403/C 403M to the following: "Precision and Bias are not currently available." Air Content (Pressure Method) Although there is an existing ASTM standard (D 6023, "Standard Test Method for Unit Weight, Yield, Cement Content, and Air Content (Gravimetric)
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From page 97... ...
But, as discussed in Chapter 3, some modifications are needed to measure compressive strength of CLSM specimens accurately and in a repeatable manner. Provisional Method of Test for Air Content of Freshly Mixed Controlled Low-Strength Material (CLSM)
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From page 98... ...
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 2 Referenced Documents 2.1 ASTM Standard A 674, "Standard Practice for Polyethylene Encasement for Ductile Iron Pipe for Water or Other Liquids" E 177, "Practice for Use of the Terms Precision and Bias in ASTM Test Methods" E 691, "Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method" G 57, "Standard Method for Field Measurement of Soil Resistivity Using the Wenner Four-Electrode Method" 2.2 Other Standards ANSI/AWWA C 105/21.5 American National Standard for Polyethylene Encasement for Ductile Iron Pipe for Water or Other Liquids 3 Significance and Use 3.1 Information on the pH of CLSM can be used as an aid in evaluating the potential corrosivity of pipe in a CLSM mixture environment.
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From page 99... ...
for standard buffered solutions. 4.2.3 A combination electrode consisting of a saturated calomel reference electrode and a glass electrode (4.2.1 and 4.2.2)
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From page 100... ...
ASTM G 57, "Standard Test Method for Field Measurement of Soil Resistivity Using the Wenner Four-Electrode Method," is an adequate test method to evaluate the resistivity of CLSM. The only proposed change is to change all references to the soil from "soil" to "soil and CLSM."
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From page 101... ...
Provisional Method of Test for Freezing and Thawing CLSM Mixtures AASHTO Designation: X 6 (2008) ASTM Designation: D 560-96 AASHTO X 6 (2008)
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From page 102... ...
2 Referenced Documents 2.1 ASTM Standards G 1, "Standard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens" D 4832, "Standard Test Method for Preparation and Testing of Controlled Low Strength Material (CLSM) Test Cylinders" C 192, "Standard Practice for Making and Curing Concrete Test Specimens in the Laboratory" C 496, "Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens" 2.2 Other Standards 3 Significance and Use 3.1 The environment in which the metallic sample is exposed directly impacts underground corrosion of metallic samples.
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From page 103... ...
Longer exposure periods are allowable, but all samples shall be evaluated for mass loss at the same exposure time. 9 Mass Loss Testing 9.1 After the exposure period has elapsed, the coupons can be removed from the CLSM by placing the CLSM specimen in a testing machine and loading similar to ASTM C 496.
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From page 104... ...
2 Referenced Documents 2.1 ASTM Standards C 136, "Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates" D 4832, "Standard Test Method for Preparation and Testing of Controlled Low Strength Material (CLSM) Test Cylinders" 3 Significance and Use 3.1 Information on the potential segregation of CLSM mixtures can be determined.
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From page 105... ...
Ensure that all aggregate and paste is removed from the segregation mold by gently washing the sides of the mold into the sieve stack. 5.6 Continue to place water onto the CLSM in the upper sieve.
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From page 106... ...
2 Referenced Documents 2.1 ASTM Standards D 4832, "Standard Test Method for Preparation and Testing of Controlled Low Strength Material (CLSM) Test Cylinders" 3 Significance and Use 3.1 Subsidence of CLSM occurs when the fresh CLSM mixture loses water and entrapped air through bleeding and absorption into the surrounding soil.
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From page 107... ...
The following subsections briefly discuss each method. Suitability for Load Application ASTM D 6024, "Standard Test Method for Ball Drop on Controlled Low Strength Material (CLSM)
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From page 108... ...
Interested practitioners may use it as a check for the proposed pressure method, AASHTO X 2. California Bearing Ratio Specimens from only six CLSM mixtures were tested for CBR values at the age of 28 days according to slightly modified AASHTO test method T 193.
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From page 109... ...
If a pipe leaks, a CLSM mixture with low permeability could make detecting the location of the leak difficult. Based on the literature review, air permeability of CLSM mixtures can be evaluated using ASTM D 4525, "Standard Test Method for Permeability of Rocks by Flowing Air." Leaching/Environmental Impact An entire procedure, shown in Figure B.4, has been proposed to evaluate constituent raw materials for potential leaching of heavy metals.
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