This is the project we have done on.

1. GUIDED BY:
MR. S. Nachimuthu
Presented BY:
J. Uma Bharathi
P. Kanageswari
Sonam Choden

2. ABSTRACT
Durability is the property required for fulfilling all the service
requirements of a mortar structure such as an RCC framed building, during
its intended life, with normal expected maintenance.
The majority of masonry structures exhibit excellent long-term
performance with comparatively low maintenance cost. Durability of a
masonry structure is influenced by many factors including the durability of
both the masonry units and mortar, as well as proper installation of a damp
proof course; the durability of the mortar contributes significantly to the
overall durability. Mortars used in masonry structures exposed to aggressive
environments are designed to resist a range of possible physical and chemical
degradations. The physical forms of degradation may be caused by abrasion
from wind action, salt crystallization and freeze-thaw action; the chemical
form of deterioration is usually caused by reactions with soluble salts.
The sulphuric acid solution can harm the structure which
may be present in the ground water, polluted building materials, sea
water, etc. The ordinary mortars have been ineffective over this
environmental condition, hence letting us to adapt high performance
mortar.

3. 1. INTRODUCTION
I.
Mortar:
Cement mortar is a building compound created by
mixing sand and a selection of aggregates with a
specified amount of water. The mortar can be used for
a number of applications, such as plastering over bricks
or other forms of masonry. Sometimes referred to as
sand cement, mortar blends today often incorporate
different grades of plastics to create various types of
polymer cement mortars.

4. II. HIGH PERFORMANCE MORTARHigh performance mortar is a
mortar mixture, which possess high durability and high strength
when compared to conventional mortar. According to ASTMC270, if the 28 days compressive strength of mortar is above
17.5 N/mm2 it is called as high performance mortar.

5. 3. CAUSES OF MORTAR
DETERIORATION
•
DETERIORATION BY SURFACE WEAR
• CRACKING BY CRYSTALIZATION OF SALTS IN
PORES:
•
DETERIORATION BY FROST ACTION
• CHEMICAL CAUSES DETERIORATION
oSULPHATE ATTACK
o ACID ATTACK

6. CHEMICAL ATTACKS
• Carbonation
• Acid attack
• Sulfate attack
• Chloride attack
• Sea water attack

7. CARBONATION
Ca(OH)2+Co2
CaCo3
Leads to Carbonation shrinkage.
Reduce the PH of the pore water and leads to corrosion.
Lab test-Phenolphthalein test

8. ACID ATTACK
It Converts Calcium compounds into calcium salts
2HCL+Ca(OH)2
H2So4+Ca(OH)2
CaCl2+2H2O
CaSo4+2H2O

9. SULFATE ATTACK
• Sulfuric acid is very corrosive which initiate the
sulfate attack which leads to corrosion.
• Corrosion of mortar consist of two stages
• H2So4+Ca(OH)2
• Gypsum+C3A
mortar
CaSo4.2H2O(Gypsum)
Expansion cracking of

10. PROCEDURE:
1. The mortar cube of 1:2 with water content
of 0.2, 0.3 and 0.4 were casted .

11. 2. After curing the mortars, it is submerged in
Sulfuric acid bath having different
normality's such as 0.3, 0.5, 1.0.

12. 3. The normality of sulphuric acid may get
alter in time, therefore the normality is
checked time to time by titration.

13. 4. By using the following formula :
V1N1=V2N2
V1=
For 0.3N add 8.5ml of sulfuric acid in
1000ml of water

14. 5. Taking the mortar weight each week after
submerging in sulphuric acid.

15. 6. The load carrying capacity is found by
using compression testing machine.

16. Erosion on mortar

17. RESULTS

18. FOR 0.3N SULPHURIC ACID
SL.NO
SAMPLE
WEIGHT
KG
WEIGHT LOSS
IN 7 DAYS
KG
WEIGHT LOSS
IN 14 DAYS
KG
1
0.2
792
773
753
2
0.2
749
729
707
3
0.2
782
762
740
4
0.3
766
751
727
5
0.3
745
732
705
6
0.3
751
737
711
7
0.4
810
803
795
8
0.4
790
874
778
9
0.4
803
796
787

19. FOR 0.5N SULPHURIC ACID
SL.NO
SAMPLE
WEIGHT
KG
WEIGHT LOSS
IN 7 DAYS
KG
WEIGHT LOSS
IN 14 DAYS
KG
1
0.2
679
655
628
2
0.2
674
653
627
3
0.2
652
630
601
4
0.3
733
713
688
5
0.3
746
726
699
6
0.3
781
762
738
7
0.4
835
827
814
8
0.4
843
833
821
9
0.4
852
842
832

20. FOR 1N SULPHURIC ACID
SL.NO
SAMPLE
WEIGHT
KG
WEIGHT LOSS
IN 7 DAYS
KG
WEIGHT LOSS
IN 14 DAYS
KG
1
0.2
774
748
710
2
0.2
792
777
742
3
0.2
794
767
730
4
0.3
806
783
752
5
0.3
777
754
723
6
0.3
781
759
724
7
0.4
827
811
790
8
0.4
807
791
771
9
0.4
829
817
795

21. FOR 0.5N SULPHURIC ACID
SL.NO
SAMPLE
WEIGHT
KG
WEIGHT LOSS
IN 7 DAYS
KG
WEIGHT LOSS
IN 14 DAYS
KG
1
0.2
730
690
635
2
0.2
715
671
614
3
0.2
691
655
598
4
0.3
794
760
716
5
0.3
767
734
690
6
0.3
789
751
708
7
0.4
796
773
733
8
0.4
821
799
762

22. FOR 0.3N SULPHURIC ACID
SL.NO
SAMPLE
WEIGHT
KG
WEIGHT LOSS
IN 7 DAYS
KG
WEIGHT LOSS
IN 14 DAYS
KG
1
0.2
679
655
628
2
0.2
674
653
627
3
0.2
652
630
601
4
0.3
733
713
688
5
0.3
746
726
699
6
0.3
781
762
738
7
0.4
835
827
814
8
0.4
843
833
821
9
0.4
852
842
832

23. FOR 1N SULPHURIC ACID
SL.NO
SAMPLE
WEIGHT
KG
WEIGHT LOSS
IN 7 DAYS
KG
WEIGHT LOSS
IN 14 DAYS
KG
1
0.2
724
676
609
2
0.2
743
694
627
3
0.2
769
720
651
4
0.3
794
753
694
5
0.3
740
700
642
6
0.3
735
690
630
7
0.4
801
763
711
8
0.4
794
756
703
9
0.4
799
761
709

24. FOR 0.5N SULPHURIC ACID
SL.NO
SAMPLE
LOAD IN KG
LOAD CARRYING
CAPACITY IN
N/MM2
1
0.2
4750
9.7
2
0.2
4250
8.7
3
0.2
4500
9.2
4
0.3
4000
8.2
5
0.3
3500
7.1
6
0.3
4250
8.7
7
0.4
3750
7.7
8
0.4
3750
7.7
9
0.4
3500
7.1

25. FOR 0.3N SULPHURIC ACID
SL.NO
SAMPLE
LOAD IN KG
LOAD CARRYING
CAPACITY IN
N/MM2
1
0.2
6000
12.2
2
0.2
5500
11.2
3
0.2
4500
9.2
4
0.3
4750
9.7
5
0.3
4500
9.2
6
0.3
5500
11.2
7
0.4
4250
8.7
8
0.4
4750
9.7
9
0.4
4250
8.7

26. FOR 1N SULPHURIC ACID
SL.NO
SAMPLE
LOAD IN KG
LOAD CARRYING
CAPACITY IN
N/MM2
1
0.2
3000
6.1
2
0.2
3000
6.1
3
0.2
3750
7.7
4
0.3
3000
6.1
5
0.3
2500
5.1
6
0.3
3250
6.6
7
0.4
2750
5.6
8
0.4
3250
6.6
9
0.4
3000
6.1

27. CONCLUSION:
 Increase in water content leads to
decrease in weight loss due to sulphate
attack.
 Strength of mortar decreases due to
sulphate attack.