Page 79 - GRIHA Manual Volume V - Introduction to National Rating System
P. 79
72 Griha Manual: Volume 5
Appraisal 15.3.3
Certify minimum 30% replacement of oPC with fly ash in plaster/masonry mortar, as per clause
15.2.3 – 2 points.
Required documentation
1. Calculations demonstrating use of fly ash in masonry mortar and plaster as a replacement
for cement.
2. manufacturer brochure, clearly stating the use of fly ash in cement and the percentage
replacement of cement by fly ash by weight.
3. a test certificate from an independent laboratory for demonstrating compliance with the
necessary strength requirements as per biS.
4. Certificate from the structural consultant in case additional fly ash is added to the design
mix in order to achieve more percentage replacement of fly ash. the boq/purchase order
of the additional fly ash should be attached as well.
Review checklist
1. Check that the percentage of fly ash as per the manufacture certificate and that used in the
calculations, should be the same.
2. Check the calculations for accuracy.
3. Check the design mix if specified and review the purchase order for additional fly ash.
Possible errors
1. the quantities of fly ash used in the calculations might not correspond with the manufacture
certificate and the purchase order.
2. the number of PPC bags purchased in the purchase order should correspond with the
calculation tables.
Point allocation
two points to be awarded to the project if more than 30% of oPC is replaced by fly ash by weight in
the masonry mortar and plaster.
Appraisal 15.3.3
Certify minimum 30% replacement of oPC with fly ash in plaster/masonry mortar, as per clause
15.2.3 – 2 points.
Required documentation
1. Calculations demonstrating use of fly ash in masonry mortar and plaster as a replacement
for cement.
2. manufacturer brochure, clearly stating the use of fly ash in cement and the percentage
replacement of cement by fly ash by weight.
3. a test certificate from an independent laboratory for demonstrating compliance with the
necessary strength requirements as per biS.
4. Certificate from the structural consultant in case additional fly ash is added to the design
mix in order to achieve more percentage replacement of fly ash. the boq/purchase order
of the additional fly ash should be attached as well.
Review checklist
1. Check that the percentage of fly ash as per the manufacture certificate and that used in the
calculations, should be the same.
2. Check the calculations for accuracy.
3. Check the design mix if specified and review the purchase order for additional fly ash.
Possible errors
1. the quantities of fly ash used in the calculations might not correspond with the manufacture
certificate and the purchase order.
2. the number of PPC bags purchased in the purchase order should correspond with the
calculation tables.
Point allocation
two points to be awarded to the project if more than 30% of oPC is replaced by fly ash by weight in
the masonry mortar and plaster.
