Date of Graduation

5-2012

Document Type

Thesis

Degree Name

Bachelor of Science in Civil Engineering

Degree Level

Undergraduate

Department

Civil Engineering

Advisor

Hale, W. Micah (William Micah), 1973-

Reader

Heymsfield, Ernestrnie

Second Reader

Grimmelsman, Kirk A.

Abstract

Self-consolidating concrete (SCC) allows for the placement of concrete without consolidation. The use of lightweight (LW) concrete reduces dead loads and lowers transportation costs. LWSCC is a recent combination of the two types of concrete; therefore there is little information on the performance of prestressed members cast with LWSCC. This project examines transfer length of LWSCC beams and compares the measured values to control-mixture members cast with normal weight SCC. Eight prestressed beams were cast. Of the eight, four conventional were cast with SCC and the remaining four with LWSCC. The lightweight mixtures contained expanded clay aggregate and had an approximate unit weight of 1880 kg/m3. The control beams were cast with normal weight SCC and had an approximate unit weight of 2340 kg/m3. The beams measured 16.5 cm x 30.5 cm x 5.5 m and contained two 15.2 mm-diameter seven-wire strands located 25cm from the extreme compression fiber. The one-day release strengths of the LWSCC beams averaged 30 MPa and the release strengths of the NWSCC beams averaged 33 MPa. The transfer (or transmission) length was measured for all beams, determined by measuring surface strains of the beam and measuring the end slip of the stand. The results were compared to standardized ACI 318 and AASHTO LRFD equations.

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