Drying Shrinkage

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: 23o C + 1.5o C • Relative Humidity: > 98 % • Duration: 7 Days and 14 Days

Drying • Mortar Bars • Temp.: 73.3 + 3 oF • RH: 50 + 4 % • Concrete Cylinders • Temp.: 96 + 3 oF • RH: 20 + 4 %

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

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

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 ?

Drying Shrinkage

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