tailieunhanh - Standard Method of Test for Slump Loss of Portland Cement Concrete

SCOPE To determine the slump loss of freshly mixed Portland Cement Concrete over a period of time. This method is typically used for drilled shaft concrete. It may also be applicable in special circumstances as deemed necessary by the RCE. The purpose of this test is to ensure that drilled shaft concrete has a slump within the range specified in Subsection of the 2007 edition of SCDOT’s Standard Specifications For Highway Construction when placed and maintains a minimum slump as specified in Subsection of the 2007 edition of SCDOT’s Standard Specifications For Highway Construction. . | Standard Method of Test for Slump Loss of Portland Cement Concrete SCDOT Designation SC-T-45 09 09 1. SCOPE . To determine the slump loss of freshly mixed Portland Cement Concrete over a period of time. . This method is typically used for drilled shaft concrete. It may also be applicable in special circumstances as deemed necessary by the RCE. . The purpose of this test is to ensure that drilled shaft concrete has a slump within the range specified in Subsection of the 2007 edition of SCDOT s Standard Specifications For Highway Construction when placed and maintains a minimum slump as specified in Subsection of the 2007 edition of SCDOT s Standard Specifications For Highway Construction. 2. REFERENCED DOCUMENTS ASTM C172 - Sampling Freshly Mixed Concrete ASTM C143 - Slump of Hydraulic-Cement Concrete ASTM C1064 -Temperature of Freshly Mixed Hydraulic-Cement Concrete ASTM C231 - Air Content of Freshly Mixed Concrete by the Pressure Meter if required ASTM C31 - Making and Curing Test Specimens in the Field if required 3. PROCEDURE Perform the test on concrete intended for use in the final product and meeting all applicable SCDOT specifications. Prepare the approved mix for the slump loss test at a temperature consistent with ambient and concrete temperatures expected during actual concrete placement. Ensure that the test batch is a minimum of 3 cubic yards. After the test batch has been mixed according to Division 700 requirements perform initial slump ASTM C143 ambient and concrete temperatures ASTM C1064 and if air entrained air content ASTM C231 . Part A In-Place Concrete To simulate in-place plastic concrete discharge approximately 1 cubic yard of test batched concrete in a hole or form having approximate dimensions of 3 feet x 3 feet x 3 feet lined with plastic to prevent moisture loss through the ground or forms. Have enough plastic to cover the top of the hole or form to prevent rapid evaporation.