CONCRETE MIX DESIGN – M-20
(A) DESIGN
STIPULATION.
|
01.
Characteristic compressive strength required |
20.0 N/mm2 |
|
02. Max.
Size of aggregate |
20mm |
|
03. Type of
cement |
SHREE PPC |
|
04. Exposure
condition |
SEVERE |
(B) RESULTS OF CEMENT
|
TEST SAMPLE REF |
SPECIFIED REQUIREMENTS |
RESULT
OBTAINED
|
AS PER IS
1489 |
|
PHYSICAL TEST |
|
||
|
SHREE PPC |
SPECICFIC GRAVITY |
3.10 |
-------- |
|
INITIAL SETTING TIME FINAL SETTING
TIME |
134.0 MIN 196.0 MIN |
Ø
30 MIN < 600 MIN |
|
|
FINENESS |
2.20 % |
< 10 % |
|
|
SOUNDNESS |
1.0 MM |
< 10 MM |
|
|
COMPRESSIVE STRENGTH
A) AT 72 + 1h B) AT 168 + 2h C) AT 672 + 4h |
26.54 N/mm2 36.20 N/mm2 55.80 N/mm2 |
>16.0 N/mm2 >22.0 N/mm2 >33.0 N/mm2 |
(C) RESULTS OF AGGREGATE (20.0
MM)
|
SIEVE SIZE |
RESULT
OBTAINED
|
AS PER IS
|
|
20.0 MM |
PARAMETER |
|
|
GRADING
40.0 MM 20.0 MM 10.0 MM 4.75 MM |
PAASING %
100.0 % 100.0 % 12.70 % 0.32 % |
(100.0) % (95-100) % (25-55) % (0-10) % |
|
SPECIFIC
GRAVITY |
2.620 |
---------- |
|
WATER ABSORPTION |
0.64 % |
< 2% |
FLASKINESS INDEX
|
14.20 % |
<25% |
|
IMPACT VALUE |
19.55 % |
< 30% |
|
ABRASION VALUE |
19.81 % |
< 30% |
|
FREE SURFACE
MOISTURE |
NIL |
----------- |
* AGGREGATE COMLY 20.0 MM AS PER IS.
(D) RESULTS OF AGGREGATE (10.0
MM)
|
SIEVE SIZE |
RESULT
OBTAINED
|
AS PER IS
|
|
10.0 MM |
PARAMETER |
|
|
GRADING
12.5 MM 10.0 MM 4.75 MM 2.36 MM |
PAASING %
100.0 % 87.96 % 8.40 % 0.72 % |
(100.0) % (85-100) % (0-20) % (0-5) % |
|
SPECIFIC
GRAVITY |
2.610 |
---------- |
|
WATER ABSORPTION |
0.54 % |
< 2% |
FLASKINESS INDEX
|
18.85 % |
<25% |
|
IMPACT VALUE |
22.18 % |
< 30% |
|
ABRASION VALUE |
19.75 % |
< 30% |
|
FREE SURFACE
MOISTURE |
NIL |
----------- |
* AGGREGATE COMLY 10.0 MM AS PER IS.
(E) RESULTS OF SAND
|
SPECIFIED REQUIREMENTS |
RESULT
OBTAINED
|
AS PER IS
383:1970
|
|
|
PARAMETER |
|
|
GRADATION
10.0 MM 4.75 MM 2.36 MM 1.18 MM 600 MICRON 300 MICRON 150 MICRON |
PAASING %
100.0 % 99.20 % 98.03 % 79.33 % 36.20 % 9.80 % 1.13 % |
(100.0) % (90-100) % (75-100) % (55-90) % (35-59) % (0-10 ) % |
SPECIFIC GRAVITY
|
2.60 |
------ |
|
WATER
ABSORPTION |
1.80
% |
< 2% |
|
SILT
CONTENT |
NIL |
<7% |
|
FREE MOISTURE SURFACE |
0.72 % |
------ |
SAND COMPLIES WITH ZONE-II.
(F) FOR 20.0 MM GRADED
AGGREGATE
|
SIEVE SIZE |
|
RESULT
OBTAINED
|
20MM: 10MM
|
AS PER IS
383
:1970
|
|
20.0 MM |
10.0 MM |
50 %:50
% |
PARAMETER |
|
|
GRADING
40.0 MM 20.0 MM 10.0 MM 4.75 MM |
% PASING
100.0 % 100.0 % 12.70 % 0.32 % |
PAASING %
100.0 % 100.0 % 87.96 % 8.40 % |
PAASING %
100.0 % 100.0 % 50.33 % 4.36 % |
(100.0) % (95-100)
% (25-55) % (0-10)
% |
ABOVE AGGREGATE COMPLY WITH 20.0
MM GRADED IN 50:50 RATIO OF 20& 10 MM AGGREGATE.
(F) GRADING FOR ALL IN
AGGREGATE
|
SIEVE SIZE |
|
20MM: 10MM
|
AS PER IS
383
:1970
|
|
|
AGGREGATE |
SAND |
55
%:45 % |
PARAMETER |
|
|
GRADING 80.0 MM 40.0 MM 20.0 MM 4.75
MM 600 MIC 150 MIC |
% PASING
100.0 % 100.0 % 100.0 % 4.36 % 0.0 % 0.0 % |
PAASING %
100.0 % 100.0 % 100.0 % 99.20 % 36.20 % 1.13 % |
PAASING %
100.0 % 100.0 % 100.0 % 47.04 % 16.29 % 0.50 % |
(100.0) % (100.0) % (95-100) % (30-50) % (10-35) % (0-6) % |
ABOVE AGGREGATE COMPLY WITH ALL IN
AGGREGATE IN 55:45 RATIO OF 20.0 MM
AGGREGATE & SAND.
(H) REFERENCES:
Following IS Codes/ IRC Publications have been followed for
conducting the suitable tests on materials and trials on design mix.
a) IS 383 – 1970 Specifications for coarse and fine aggregate from natural source for concrete.
b) IS 2386 – 1963 Methods
of tests of aggregate for
c) IS 456 – 2000 Code of practice for Plain & Reinforced concrete
d) IS 10262 – 2009 Recommended guidelines for concrete mix design.
e) SP 23 Hand
book on concrete mixes.
(I) MATERIAL RECIVED
1) Coarse Aggregate : 10
bags: (MARUDI)
2) Sand
:
05 bags (LUNI)
(J) TARGET MEAN
STRENGTH.
For M-20
20+ 1.65X4.0 : 26.60 N/mm2
(K) FREE WATER CONTENT BASED ON TRIALS IS = 157.50
litre
(L) CALCULATION OF
CEMNT CONTNET
WATER-CEMENT RATIO =
0.45
CEMENT
CONTENT = 157.50 =
350.00 Kg/m3
0.45
(M) MIX
CALCULATION
|
A |
VOLUME OF
CONCRETE |
1 m3 |
= 1
m3 |
|
B |
VOLUME OF
CEMENT |
= 350.0 X 1 3.10
1000 |
= 0.113 m3 |
|
C |
VOLUME OF
WATER |
= 157.50 X 1 1.0
1000 |
= 0.1575 m3 |
|
D |
VOLUME OF
PLASTICIZER @ 0.80 %
BY MASS OF CEMENT MATERIAL |
= 2.800 X
1 1.220
1000 |
= 0.0022 m3 |
|
E |
ENTRAPPED
AIR |
=2.0 % PER CUBIC METER |
= 0.0200 m3 |
|
F |
VOLUME OF
ALL IN AGGREGATE |
=[ A-(B+C+D+E)] |
= 0.7073 m3 |
|
G |
MASS OF
COARSE AGGREGATE |
=0.7073X0.55X2.615X1000 |
= 1017.27 Kg |
|
H |
MASS OF
FINE AGGREGATE |
=0.7073X0.45X2.60X1000 |
= 827.54 Kg |
|
H |
CORRECTION
FOR WATER ABSORPTION FOR C.A |
=1017.27X0.59/100 |
= 6.00 Kg |
|
H |
CORRECTION
FOR WATER ABSORPTION FOR F.A |
=827.547X1.08/100 |
= 8.93 Kg |
|
|
TOTAL WATER |
= 157.50+6.0+8.93 |
= 172.43 Kg |
(N) MIX PROPORTION
|
MIX DETAIL |
AS BELOW |
|
W/C RATIO |
0.45 |
|
CEMENT( SHREE PPC) |
350.00 Kg |
|
SAND (FA) (LUNI RIVER) |
836.47 Kg |
|
AGGREGATE (CA) (MARUDI) |
1023.27 Kg |
|
WATER (BHATKHA) |
172.43 Kg |
DETAIL OF FINAL RECOMMANDATION
MGEL/TR/MD/01519-I
|
S.NO |
MATERIAL |
QTY |
SLUMP DETAIL |
TEMP |
COMPRESSIVE
STRENGTH 7 DAYS |
COMPRESSIVE STRENGTH 28 DAYS |
|
|
1 |
CEMENT( SREE CEMENT PPC) |
350.00
KG |
INITIAL |
190 MM |
34.8ºC |
21.40 N/mm2 |
28.44
N/mm2 |
|
SAND |
836.00
KG |
20.55 N/mm2 |
27.90 N/mm2 |
||||
|
20.0
MM |
512.00
KG |
60 MIN |
150 MM |
21.24 N/mm2 |
28.15 N/mm2 |
||
|
10.0
MM |
512.00
KG |
AVG: 21.06 N/mm2 |
AVG: 28.16 N/mm2 |
||||
|
WATER |
172.40 KG |
120 MIN |
110 MM |
||||
|
PLASTICIZER |
2.800
KG |
||||||
A)
Recommendation is based on material which is
submitted by the party.
B)
So maintain the above quality of mix please
check gradation & water absorption of coarse aggregate & fine aggregate
regularly.
C)
Regular checking the slump at placing of
concrete.
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