Effect of Sulphuric acid on High Performance Mortar, Civil Engineering
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Transcript of Effect of Sulphuric acid on High Performance Mortar, Civil Engineering
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EFFECT OF SUPHURIC ACID ON HIGH PERFORMANCE MORTAR
GUIDED BY:MR. S. Nachimuthu
Presented BY:J. Uma BharathiP. KanageswariSonam Choden
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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.
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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.
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II. HIGH PERFORMANCE MORTARHigh performance mortar is a mortar mixture, which possess high durability and high strength when compared to conventional mortar. According to ASTM-C270, if the 28 days compressive strength of mortar is above 17.5 N/mm2 it is called as high performance mortar.
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3. CAUSES OF MORTAR DETERIORATION• DETERIORATION BY SURFACE WEAR
• CRACKING BY CRYSTALIZATION OF SALTS IN PORES:
• DETERIORATION BY FROST ACTION
• CHEMICAL CAUSES DETERIORATION
o SULPHATE ATTACKo ACID ATTACK
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CHEMICAL ATTACKS
• Carbonation
• Acid attack
• Sulfate attack
• Chloride attack
• Sea water attack
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CARBONATION
Ca(OH) 2+Co 2 CaCo 3
Leads to Carbonation shrinkage.
Reduce the PH of the pore water and leads to corrosion.
Lab test-Phenolphthalein test
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ACID ATTACK
It Converts Calcium compounds into calcium
salts
2HCL+Ca(OH) 2 CaCl 2+2H 2O
H 2So 4+Ca(OH) 2 CaSo 4+2H 2O
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SULFATE ATTACK
• Sulfuric acid is very corrosive which initiate the sulfate attack
which leads to corrosion.
• Corrosion of mortar consist of two stages
• H 2So 4+Ca(OH) 2 CaSo 4.2H 2O(Gypsum)
• Gypsum+C 3A Expansion cracking of mortar
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PROCEDURE:
1. The mortar cube of 1:2 with water content of 0.2, 0.3 and 0.4 were casted .
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2. After curing the mortars, it is submerged in Sulfuric acid bath having different normality's such as 0.3, 0.5, 1.0.
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3. The normality of sulphuric acid may get alter in time, therefore the normality is checked time to time by titration.
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4. By using the following formula :
V1N1=V2N2
V1=
For 0.3N add 8.5ml of sulfuric acid in 1000ml of water
1000 X 0.336
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5. Taking the mortar weight each week after submerging in sulphuric acid.
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6. The load carrying capacity is found by using compression testing machine.
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Erosion on mortar
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RESULTS
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FOR 0.3N SULPHURIC ACIDSL.NO SAMPLE WEIGHT
KGWEIGHT LOSS IN 7 DAYSKG
WEIGHT LOSS IN 14 DAYSKG
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
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FOR 0.5N SULPHURIC ACIDSL.NO SAMPLE WEIGHT
KGWEIGHT LOSS IN 7 DAYSKG
WEIGHT LOSS IN 14 DAYSKG
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
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FOR 1N SULPHURIC ACIDSL.NO SAMPLE WEIGHT
KGWEIGHT LOSS IN 7 DAYSKG
WEIGHT LOSS IN 14 DAYSKG
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
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FOR 0.5N SULPHURIC ACIDSL.NO SAMPLE WEIGHT
KG
WEIGHT LOSS IN 7 DAYSKG
WEIGHT LOSS IN 14 DAYSKG
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
9 0.4 814 792 750
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FOR 0.3N SULPHURIC ACIDSL.NO SAMPLE WEIGHT
KG
WEIGHT LOSS IN 7 DAYSKG
WEIGHT LOSS IN 14 DAYSKG
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
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FOR 1N SULPHURIC ACIDSL.NO SAMPLE WEIGHT
KGWEIGHT LOSS IN 7 DAYSKG
WEIGHT LOSS IN 14 DAYSKG
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
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FOR 0.5N SULPHURIC ACIDSL.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
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FOR 0.3N SULPHURIC ACIDSL.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
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FOR 1N SULPHURIC ACIDSL.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
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CONCLUSION:Increase in water content leads to
decrease in weight loss due to sulphate attack.
Strength of mortar decreases due to sulphate attack.