الهندسة المدنية تقرير بحث الخرسانة ذاتية الدمك type of concrete civil engineering research report self Compacting Concrete
الهندسة المدنية تقرير بحث الخرسانة ذاتية الدمك type of concrete civil engineering research report self Compacting Concrete
PPT on self compacting ConreteFull description
Self compacting concrete can be placed and compacted under its own weight without any vibration and without segregation or bleeding. The use of mineral admixture such as fly ash, GGBS, etc. as partial replacement of cement in SCC can bring down cost.
Report :SELF HEALING CONCRETE
Self Healing Concrete -Abstract
This paper describes the methdology of using shotcrete concrete technology.Full description
Concrete
Self compacting concrete SCC is relatively a recent development in the construction world. SCC is defined basically by two properties Deformability and segregation resistance. It flows under its own weight while remaining homogeneous in composition.
Self compacting concrete SCC is a very fluid concrete and a homogeneous mixture that solves most of the problems related to ordinary concrete. Self Compacting Concrete gets dense and compacted due to its own self weight. An experimental investigation
Cement concrete possesses the most significant job in the field of common building. Cement is the most significant part in Concrete which ties the Totals together, however its creation is very vitality expending and adds to about 7 of Greenhouse gase
A very useful presentation on Self Esteem, designed with the help of very renowned personality Shiv Khera's book 'You can Win'
Development of Self-compacting High and Ultra High Performance Concretes
Conventional concrete used in building and civil engineering applications requires compaction to achieve strength, durability and homogeneity. The typical method of compaction, vibration, generates delays and additional costs in projects and moreover
Self compacting concrete is a non segregating concrete that is placed by means of its own weight. It is highly flow able concrete that can spread without need of vibration. In this study steel and polypropylene fiber are used as hybrid fiber to enhan
Ready Mix Concrete PptFull description
C1621Descripción completa
Self Compacting Concrete (SCC) merupakan salah satu metode yang dipergunakan dalam suatu keadaan tertentu dimana penggunaan metode konvensional tidak dapat dipergunakan, sehingga agar dapat menggun...
By Dr. Mohammed Arafa A brief description of
SELF COMPACTING CONCRETE
INTRODUCTION A special type of concrete concrete of flowing consistency.
Developed initially in Japan in 1980s to offset the growing shortage of skilled labour.
The composition in addition to cement and water, consists of high amount of super plasticizer, high powder content and a viscosity modifying agent.
REQUIREMENTS For a mixture to have self compatibility, it should have
Filling ability
Passing ability
Segregation resistance
REQUIREMENTS OF CONSTITUENT MATERIALS CEMENT
Type depends on the overall requirements for concrete such as strength, durability, etc.
C3A content higher than 10% may cause poor workability retention.
Typical cement content – 350 to 450 kg/m3.
Cement > 500kg/m3 cause increase in shrinkage.
Cement < 350kg/m3 demands other fine fillers such as flyash, pozzolan, etc.
AGGREGATE SANDS
All normal sands are suitable for SCC, Fines less than 0.125mm - powder, very important for SCC.
COARSE AGGREGATE
All types of aggregates are suitable for SCC, Normal maximum size is generally 16 – 20mm, Crushed aggregates improve strength while rounded aggregate improve flow.
Fly ash: In appropriate quantity may be the added the quality
Silica fumes: Added to improve the mechanical properties of scc.
Stone powder: finely crushed lime stone, dolomite or granite added to increase the powder content.
Fibres: fibres may be used to enhance the properties of scc as same as normal concrete
MIX PROPORTIONING FOR ACHIEVING SELF COMPACTION.
Changes in the coarse aggregate content.
Changes in the fine aggregate content.
Use of super plasticizers.
Combination of most suitable water cement ratio and superplasticizer powder ratio.
Coarse aggregate content-50% of solid volume.
Fine aggregate content-40% of mortar volume.
ROLE OF SUPERPLASTICIZERS.
FLOW DIAGRAM OF MIXDESIGN SYSTEM.
METHODS OF SCC:
PROF. Okamura broadly classified it in 1997.
They are two types
Powder based.
Viscosity enhancing agent based.
Typical scc mixes in Japan. Ingredients
Powder type
VEA type
Water kg/m3
175
165
Cement kg/m3
530
220
F.A kg/m3
751
870
C.A kg/m3
789
825
Fly ash kg/m 3
70
0
Silica fumes kg/m3
0
0
HRWR kg/m3
9.0
4.4
VEA kg/m3
0
4.1
PROPORTIONING OF SCC RECOMMENDATIONS. constituents
Powder type
VEA Type
Coarse aggregate
0.28-0.35m3/m3 0.28-0.35m3/m3
Water content
155-175kg m 3
-
W/p
28-37%
-
Powder content 0.16-0.19m 3/m3 >0.13m3/m3 Air content
SELECTED CASE STUDY SCC was used in the construction of the two anchorages of the bridge. concrete was transported 200 meters through pipes, with out segregation to the actual casting site . In the final analysis self-compacting concrete shortened the anchorage construction period by 20%.
Akashi-Straits Bridge
CONCLUSION.
Self-Compacting Concrete is considered to be the most promising building material for the expected revolutionary changes on the job site.
We can create durable and reliable concrete structures using SCC