Drying Shrinkage Presentation By Savita Goel May 17, 2002

Overview Test Program Test Results Data Phase II Tests

Specifications ASTM C 157 ASTM C 490

Specimens: Mortar Bars Size: 1”x1”x10” No.: 3 nos. with studs at each end along the length of the bar Total Bars Made: 144

Specimens: Concrete Cylinders Size: 6”x12” No.: 2 nos. with 3 demec stud points along the surface on each cylinder Total cylinders made: 108

Curing Temperature: 23 o C o C Relative Humidity: > 98 % Duration: 7 Days and 14 Days

Drying Mortar Bars –Temp.: o F –RH: % Concrete Cylinders –Temp.: o F –RH: %

Instrumentation Length Comparator Demec Strain Gage

Length Measurement Age Length measured at drying age of –4, 7, 14, 21, 28, 35, 42, 49, 56, 90, 180 and 365 Days

Mixtures Mortar: 24 mixtures Concrete: 12 mixtures

Tests Fresh Concrete –Slump (5 + 1 ½ ”) –Air Content (6 + 1 ½ %) –Unit Weight –Temperature Hardened Concrete –Compressive Strength (at 7 & 28 Days)

Phase II Test 25 Concrete Mixtures Based on Comp. Strength and Strength Ratio Specimens: –4”x4”x10” Concrete Bars –6”x12” Concrete Cylinders

Thank You ! Any Questions ?