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1.QUALITY REQUIREMENTS OF CONCRETE - MAKING MATERIALS
2.CEMENTS
2.CEMENTS
3.CHEMICAL ADMIXTURES
4.MINERAL ADMIXTURES
Flyash ( Good Quality) (15-35% in PPC)
Fineness: 3200 Cm2/gm (Min.)
Lime Reactivity: 4.5 N/mm2 (Min.)
Loss on Ignition: 5% (Max.)
2. GGBS (Ground Granulated Blast Furace
Slag) (25-70%)
3.Silica Fume (5-10%)
Fineness: 1,50,000 Cm2/gm (Min.)
(BET)
Flyash ( Good Quality) (15-35% in PPC)
Fineness: 3200 Cm2/gm (Min.)
Lime Reactivity: 4.5 N/mm2 (Min.)
Loss on Ignition: 5% (Max.)
2. GGBS (Ground Granulated Blast Furace
Slag) (25-70%)
3.Silica Fume (5-10%)
Fineness: 1,50,000 Cm2/gm (Min.)
(BET)
5.WATER
The pH of Water: Not less than 6
Acidity/Alkalinity test:
a)To neutralize 100 ml sample of water,
using phenolphthalein as an indicator,
it should not require more than 5ml of
0.02 N NaOH.
b) To neutralize 100 ml sample of water,
using mixed indicator,it should not require
more than 25ml of 0.02N H2SO4.Mixed indicator
to get sharp end point,green to yellow.
Dissolve 0.02g methyl red &0.01g bromocresol green
in 100ml 95% ethyl or isopropyl alcohol.
The pH of Water: Not less than 6
Acidity/Alkalinity test:
a)To neutralize 100 ml sample of water,
using phenolphthalein as an indicator,
it should not require more than 5ml of
0.02 N NaOH.
b) To neutralize 100 ml sample of water,
using mixed indicator,it should not require
more than 25ml of 0.02N H2SO4.Mixed indicator
to get sharp end point,green to yellow.
Dissolve 0.02g methyl red &0.01g bromocresol green
in 100ml 95% ethyl or isopropyl alcohol.
6.LIMITS FOR SOLIDS,IN WATER
7.TESTS WITH DISTILLED WATER
(i)The initial setting time of test block made
with the cement &water proposed to be
used should not be less 30 minutes &
should not differ by +/- 30 minutes from the initial setting time of test block prepared with the same cement and distilled water.
(ii)The average 28-day compressive strength of 3,15cm cubes prepared with the water proposed to be used shall not be less than 90% of the average strength of 3 similar cubes prepared with distilled water.
(i)The initial setting time of test block made
with the cement &water proposed to be
used should not be less 30 minutes &
should not differ by +/- 30 minutes from the initial setting time of test block prepared with the same cement and distilled water.
(ii)The average 28-day compressive strength of 3,15cm cubes prepared with the water proposed to be used shall not be less than 90% of the average strength of 3 similar cubes prepared with distilled water.
8.FIBRES IN CONCRETE (Steel & Polypropylene)
Crack-control
Impact resistance
Abrasion resistance
Increased flexural strength
STEEL FIBRES:
(0.5-1.5% by volume of concrete)
Aspect Ratio: 80-100
POLYPROPYLENE FIBRES
0.6-1.8 Kg/m3 of concrete.
Crack-control
Impact resistance
Abrasion resistance
Increased flexural strength
STEEL FIBRES:
(0.5-1.5% by volume of concrete)
Aspect Ratio: 80-100
POLYPROPYLENE FIBRES
0.6-1.8 Kg/m3 of concrete.
9.TESTS (Which can be conducted at site)
1.Flyash in PPC(using 1:1 HCl)
(About 95% of flyash & 4-5% of OPC
are insoluble)
1.Flyash in PPC(using 1:1 HCl)
(About 95% of flyash & 4-5% of OPC
are insoluble)
2.Fineness of flyash,by wet sieving through
45 micron sieve (Optional Test)
45 micron sieve (Optional Test)
3.The pH of water
4.Sp.gr of superplasticizer(using a Hydrometer)
5.Silt in sand (by volume) (CPWD Method)
6.Sieve Analysis of C.A and F.A
7.Cement-Admixture compatibility
8.Estimation of chloride content of fresh concrete
9.Estimation of cement content of fresh concrete
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