AASHTO TP 137-20 pdf free download

AASHTO TP 137-20 pdf free download.BoxTest in Slip Form Paving of Fresh Portland Cement Concrete.
1.SCOPE
This test method describes the workability measurement of hydraulic-cement concrete in a slip formed paving applications, both in the laboratory and in the field.
The values stated in either inch-pound units or SI units are to be regarded separately as the standard. Within the text, the SI units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
This standard does not put port to address all the safety concerns, if any, associated with its use. It is the responsihihiy of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatoty limitations prior to use.
The text of this standard references notes and endnotes that provide explanatory information. These notes and footnotes shall not be considered as requirements of this standard.
2.REFERENCED STANDARDS
AASHTO Standards:
• R 60, Sampling Freshly Mixed Concrete
• T 11 9M/T 119, Slump of Hydraulic Cement Concrete
2.2. Other Documents:
• Alturki, R. Quantitative Evaluation in the Box Test and Evaluation of Field Mixtures by the
Tarantula Curve. Oklahoma State University at Stillwater, OK, M.S. Thesis, December 2016.
• Cook, M., M. Ley, and A. Ghaeezadah. A Workability Test for Slip Formed Concrete
Pavements. Con.s’truction and Building Materials, Vol. 68, 2014, pp. 376—383.
3.SUMMARY OF TEST METHOD
This test method composes a two-part measurement to assess the dynamic behavior (i.e., ability to flow) of plastic concrete through vibration and the static behavior (i.e., ability to hold an edge) of plastic concrete mixtures through removal of forms.
3.2. First, a sample of unconsolidated concrete is filled into a standard box.
3.3. Second, a vibrator is used to consolidate the concrete using the standard procedure.
3.4. Third, the forms are removed and the amount of voids are determined. This parameter indicates the responsiveness of a mixture to vibration.
3.5. Last, a straightedge is used to measure top and bottom edge slumping. This parameter indicates the potential of a mixture to edge slump.
SIGNIFICANCE AND USE
This test method provides a simplistic and economic approach to determine the workability of slip formed paving applications. This test method measures the response of a pavement mixture to vibration and the ability of the concrete to hold an edge.
4.2. This test method is not considered applicable to mixtures with a slump greater than 3 in. (75 mm) as measured in T 1 19M/T 119.
APPARATUS
The box test apparatus is composed of a platform, box test forms, form holders, a vibrator, and a straightedge as shown in Figure 1.
5.2. Box Test Forms—For enclosing a 1-ft3 (0.028-rn3) sample as shown in Figure 2; shall he made of 0.5-in. (12.5-mm) plywood with an inside measurement for length, width, and height of 12 in (300 mm) when connected together for a box shape with an open top and bottom. Two form
clamps were installed in two of the four corners of the forms to create L-shaped forms as shown in Figure 2.AASHTO TP 137-20 pdf download.