Preparation for grouting of Post Tension work/Grouting of tendon

Описание: Tests-Fluidity test & Compressive strength test

Post Tensioning Systems
• DYWIDAG Post-Tensioning System - Multiple Anchorages (MA) tendon
• UPS Systems - Flat Anchorage (FA) tendon

Proposed grout mix
• Cement in standard 50kg package (Ordinary Portland Cement)
• Water = 0.44 x 50kg = 22 kg= 22 liters
• Admixture = 0.4% weight of cement (50 kg) = 200gm StoCrete AEG
• Mixing sequence = water – additive – cement
• Min mixing time = 3-5 min

Fluidity test
• Fluidity test will be executed by means of a flow cone.
• Flow time is measured with a stop watch.
• It is the measurement of time for 1 liter grout takes to completely flow out of the cone.
• It is carried out immediate after mixing.
• The flow time should be between 10 to 25 seconds.

Compressive strength test
• 6 test cubes of 100 x 100 x 100 mm shall be prepared per grouting session.
• After 24 hours, remove cubes from mould and store in the water storage tank.
• Average compressive strength of 3 cubes shall be tested at 7 and 28 days.
• According to specification, average compressive strength of 3 cubes shall be:
7 days: minimum of 21 N/mm2
28 days: minimum of 30 N/mm2

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