Chapter 3: Tests and Implementation.
The self compacting geopolymer concrete should possess following properties:
1. Flow ability: It is the property of fresh concrete mix to flow and fully fill complex formwork under an action of its self weight. Slump flow test is performed to check flow ability of concrete.
2. Viscosity: It is the property of concrete to resist flow at a glance when it started. Low viscosity concrete will flow quickly but for a short duration while high viscosity concrete will flow slowly but for longer duration. V-Funnel test is conducted to find its viscosity.
3. Passing ability: It is the property of fresh concrete to pass through congested reinforcement assemblies or bars. It depends on the aggregate size used. L-box test is performed to …show more content…
The equipment consists of a V-shaped tunnel, shown in fig. An alternative type of V-funnel, the O funnel, with a circular section is also used in Japan. The described V-funnel test is used to determine the filling ability (flow ability) of the concrete with a maximum aggregate size of 20mm.The funnel is filled with about 12 liter of concrete and the time taken for it to flow through the apparatus measured. After this the funnel can be refilled concrete and left for 5 minutes to settle. If the concrete shows segregation then the flow time will increase significantly. 3.2.2 Assessment of test Though the test is designed to measure flow ability, the result is affected by concrete properties other than flow. The inverted cone shape will cause any liability of the concrete to block to be reflected in the result – if, for example there is too much coarse aggregate. High flow time can also be associated with low deformability due to high paste viscosity, and with high inter-particle friction. While the apparatus is simple, the effect of the angle of the funnel and the wall effect on the flow of concrete are not clear. 3.2.3
The self compacting geopolymer concrete should possess following properties:
1. Flow ability: It is the property of fresh concrete mix to flow and fully fill complex formwork under an action of its self weight. Slump flow test is performed to check flow ability of concrete.
2. Viscosity: It is the property of concrete to resist flow at a glance when it started. Low viscosity concrete will flow quickly but for a short duration while high viscosity concrete will flow slowly but for longer duration. V-Funnel test is conducted to find its viscosity.
3. Passing ability: It is the property of fresh concrete to pass through congested reinforcement assemblies or bars. It depends on the aggregate size used. L-box test is performed to …show more content…
The equipment consists of a V-shaped tunnel, shown in fig. An alternative type of V-funnel, the O funnel, with a circular section is also used in Japan. The described V-funnel test is used to determine the filling ability (flow ability) of the concrete with a maximum aggregate size of 20mm.The funnel is filled with about 12 liter of concrete and the time taken for it to flow through the apparatus measured. After this the funnel can be refilled concrete and left for 5 minutes to settle. If the concrete shows segregation then the flow time will increase significantly. 3.2.2 Assessment of test Though the test is designed to measure flow ability, the result is affected by concrete properties other than flow. The inverted cone shape will cause any liability of the concrete to block to be reflected in the result – if, for example there is too much coarse aggregate. High flow time can also be associated with low deformability due to high paste viscosity, and with high inter-particle friction. While the apparatus is simple, the effect of the angle of the funnel and the wall effect on the flow of concrete are not clear. 3.2.3