By
Kaushal Kishore
Materials Engineer, Roorkee

Self-compacting concrete (SCC) is a special type of concrete which can be placed and consolidated under it’s own weight without any vibration effort due to it’s excellent deformability, and which at the same time is cohesive enough to be handled without segregation or bleeding.

WORKABILITY:
The workability of self-compacting concrete is measured by the usual slump cone having a base diameter of 200mm, top dia 100mm, and height 300mm. The slump cone is to be placed as usual upon a base plate square in shape is having at least a 700m side. Concentric circles are marked around the center point where cone is to place. A firm circle is drawn at 500mm diameter. (more…)

INTRODUCTION
The available mix design methods are mostly dependent on charts, graphs and empirical relations from repetitive experiments following the same principle with a little bit of variations in different mix methods. Some of the commonly known design methods are-
1. Trial and Adjustment method of mix design
2. British DoE mix design method
3. ACI mix design method
4. Concrete mix proportioning-IS Guidelines
5. Rapid method for mix design
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By
1. Gursharan Singh
2. Er Harish Kumar
3. Professor Geetinder Kaur
4. Professor jaspreet Singh
Department of Civil Engineering and Technology.
Guru Kashi University. Talwandi Sabo, Punjab, India

Abstract- The paper deals with the effects of addition of various proportions of polypropylene fiber on the properties of high strength concrete m20 mixes.An experimental program was carried out to explore its effects on compressive strength under different curing condition. the main aim of the investigation program is to study the effect of polypropylene fiber mix by varying content such as 0%,0.5%,1%,1.5%,2% and find the optimum polypropylene fiber content.the concrete specimen were tested at different age level for mechanical properties of concrete name compressive strength of the concrete .a detailed study was carried out of curing conditions.the increase were compressive strength

KEYWORDS-Ordinary portland cement,polypropylene fiber, different curing condition.

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(FOR BANGAlORE REGION)
DESIGNED By: G.PRABHAKARAN M.TECh, QA/QC ENGINEER

Mix proportioning for a concrete of M25 grade is given in A·I to A-ll.
A·I STIPULATIONS FOR PROPORTIONING

a) Grade designation : M25
b) Type of cement : OPC 53 Grade conforming IS 12269
c) Maximum nominal size of aggregate : 20mm
d) Minimum cement content : 300 kg/m³ (IS 456:2000)
e) Maximum water-cement ratio : 0.50 (Table 5 of IS 456:2000)
f) Workability : 100-120mm slump
g) Exposure condition : Moderate (For Reinforced Concrete)
h) Method of concrete placing : Pumping
j) Degree of supervision : Good
k) Type of aggregate : Crushed Angular Aggregates
m) Maximum cement content : 340 kg/m³
n) Chemical admixture type : Super Plasticizer ECMAS HP 890

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(FOR BANGAlORE REGION)
DESIGNED By: G.PRABHAKARAN M.TECh, QA/QC ENGINEER

Mix proportioning for a concrete of M30 grade is given in A·I to A-ll.
A·I STIPULATIONS FOR PROPORTIONING

a) Grade designation : M30
b) Type of cement : OPC 53 Grade conforming IS 12269
c) Maximum nominal size of aggregate : 20mm
d) Minimum cement content : 320 kg/m³ (IS 456:2000)
e) Maximum water-cement ratio : 0.45 (Table 5 of IS 456:2000)
f) Workability : 100-120mm slump
g) Exposure condition : Moderate (For Reinforced Concrete)
h) Method of concrete placing : Pumping
j) Degree of supervision : Good
k) Type of aggregate : Crushed Angular Aggregates
m) Maximum cement content : 360 kg/m³
n) Chemical admixture type : Super Plasticizer ECMAS HP 890

(more…)