01336722

Component

Pavement deformation caused by the temperature and moisture variation within the slab thickness is known as curling and warping. The curling and warping stresses without traffic loading can be critical on the performance of portland cement concrete (PCC) pavements at early ages. Supplementary cementitious materials (SCMs) are used often in concrete mixtures to improve the mixture properties in both fresh and hardened concrete with the current demand for PCC sustainability. Fly ash and slag are one hundred percent recycled materials. They mitigate CO2 emissions in order to produce Portland cement concrete, and reduce landfill disposal of industrial byproducts. In this research, nine concrete mixtures including one control mixture, two binary mixtures, and six ternary mixtures, with various combinations of fly ash (class C), slag (grade 100 ground granulated blast furnace slag), and Portland cement (Type I), were fabricated. The thermal and mechanical properties of selected ternary mixtures were measured to characterize each mixture and critical temperature gradient through the slab thickness were generated using the enhanced integrated climatic model (EICM). Using the measured mechanical properties, nonlinear temperature, and coefficient of thermal expansion (CTE) gradients throughout the slab thickness, the stress analysis of ternary mixtures were performed to calculate the critical tensile stress on the PCC pavements. The calculated tensile stresses of ternary mixture were compared to the tensile strengths of each ternary mixture, and it was found that several ternary mixtures are vulnerable to curling tensile cracking at the bottom of the pavement at an early age.

01329018

11-2071

English

20p

2011

Transportation Research Board 90th Annual Meeting

DVD

Figures (9) ; References (22) ; Tables (3)

Admixtures; Curling; Fly ash; Mechanical properties; Pavement performance; Portland cement concrete; Recycled materials; Tensile strength; Thermal properties

Ternary mixtures; Warping

Highways; Materials; Pavements; I32: Concrete

Transportation Research Board Annual Meeting 2011 Paper #11-2071

TRIS, TRB

Feb 17 2011 6:02PM