self compacting concrete

C P A C S E L F - C O M P A C T I N G C O N C R E T E 1

2 C P A C S E L F - C O M P A C T I N G C O N C R E T E

CPAC Self-CompactingConcrete

(Honeycomb)

(Tremie Process)

CPAC Self-Compacting

Concrete

In any concrete construction, a properly compacted

concrete is definitely needed in order to achieve preferable

properties, especially serviceability and durability, of the

hardened concrete. In many applications, getting concrete be

properly compacted becomes very difficult or even impossible

with only use of conventional concrete and conservative

equipment. Design engineers, contractors, and site supervisors

have usually had problems dealing with complicated or very

congested steel reinforcements structures, particularly how

to make concrete thoroughly fills the formworks without

segregation and honeycomb-void structure, as well as to


Concrete with honeycombed voids having decreased loading capacity and durability

eventually obtain the designed strength . This is also called for the case in applications

such as tremied process, where the concrete can not be placed under normal practice.

Such application or in general structural repair require concrete that has self-flowable

characteristic in addition to other properties (i.e. non-shrink, shear resistance) of

conventional repairing materials. Today, all those problems can be solved by the CPAC

Self-Compacting Concrete.


CPACSelf-CompaConcrete

The Innovation of Modern Construction

78 . CPAC Self- Compacting Concrete CPAC Self-Compacting Concrete with a slump flow of 78 cm.

CPAC Self-Compacting Concrete (Deformability) (FillingAbility) (Segregation Resistance)

CPAC Self-Compacting Concrete is aCPACs innovation, researched and developed tosimultaneously have all of the desired properties,high deformability, filling ability, and segregation

resistance. It can flow easily through allcomplicated and congested steel reinforcements,filling well all over the formworks and compactingitself (by its own weight) without any need ofvibration. Furthermore, the hardened concrete haslow permeability, making it highly durable andhaving long lasting service life.

CPAC Self-Compacting Concrete (Filling Ability)

CPAC Self-Compacting ConcreteA Secret of CPAC Self-Compacting Concrete


acting

Water content effects the placing property of concrete.

Normally, deformability and segregationresistance of concrete have reverse relationship.Generally, when water content in the mixtureincreases, deformability deforms better but thesegregation can be found easier. This can beseen as in the case of high slump concrete.Conversely, for low slump concrete it is verydifficult to deform or to flow through thereinforcing steels in the structure.

With strong determination to overcome theabove limitations, a concrete technologist team ofCPAC had unceasingly researched and developedthe optimal concrete proportion that can attainboth high deformability and high segregationresistance. As a result, CPAC Self-CompactingConcrete features the highest filling ability whichcan flow, without segregation, into the formworksby its self-weight with no need of vibration.

A Formula of Flowability

CPAC Self-CompactingConcrete

1. (Solid Volume)

2.

3. (Water/Binder)


Self-Co

There are several factors effecting theformulation of CPAC Self-Compacting Concrete.Among the important ones are :

1. Volume of Coarse Aggregates : Thevolume of coarse aggregates shall not be a toohigh a proportion of the overall solid volume. Thisis to minimize the contact surface area, whichhelp preventing coarse aggregates from cloggingwhile flowing through the steel reinforcement.

2. Volume of Fine Aggregates : The volumeof fine aggregates has to be at optimal levelwhen compared to the volume of mortar. This isto reduce friction and to obtain optimal viscosityas well as to improve deformability.

3. Water-to-Binder Ratio : The ratio ofwater-to-binder shall be optimal in order toprevent segregation and clogging betweenaggregates and steel reinforcement.

4. Pozzolanic Materials : Pozzolanicmaterials is added into concrete mixture toincrease the binder content. This improvessegregation resistance and at the same timemaintains deformability at desirable level.Pozzolanic material also helps increase long termcompressive strength and durability as well asreduce cracking caused by the heat fromhydration reaction.

5. Special-Grade Superplasticizer : As amatter of fact that, without any additive oradmixture material, concrete with low water-to-binder ratio has high viscosity. The CPACsspecial-grade superplasticizer greatly increasesdeformability while keeping segregation resistanceat high level.

CPAC Self-Compacting Concrete Flow verification equipment at the job site of CPAC Self-Compacting Concrete

4. (Binder)

5. Superplasticizer Superplasticizer


CPACompactingConcrete

The Superior Benefits of CPAC Self-Compacting Concrete

1. CPAC Self-Compacting Concrete

2.

3. CPAC Self-Compacting Concrete (Construction Joint)

4. CPAC Self-Compacting Concrete (CSH)

1. Quicker and more convenient way ofconcrete placing Attributed to flowability andself compaction without vibration, placing of CPACSelf-Compacting Concrete, by any means such ascranes, conveyors or pumps, can be finished easierand faster.

2. Saving overall concreting cost Due to highworkability, placing of CPAC Self-CompactingConcrete needs less workers and vibratingequipments than of ordinary concrete. Evidently,this also reduces the number of skilled workers withmaintaining such a same number over the entireconstruction period.

3. Reducing complications and technical-problem-solving cost Employing CPAC Self-Compacting Concrete enables a single time concreteplacing to be possible. As a result, the reduced costof additional reinforcing steel and formworks wouldbe achieved. It also eliminates any additionaltechnical-problem-solving cost such as in placingof high columns or high walls where we need tomake a placing opened space or to sectionize theformworks creating construction joints.

4. Superior quality of concrete structureEffectively compacted in formworks and increasedCSH content from pozzolanic reaction, the hardenedCPAC Self-Compacting Concrete gives both higherstrength and higher durability than ordinary concrete.


Complicated structure with heavily congested reinforcing steel that vibration is almost impossible

CPAC Self-Compacting Concrete

1. Steel Composited Column, SandwichedComposite Box, I-Girder, T-Girder, Lining

2.

3. 4. 5. 6.

CPAC Self-Compacting Concrete is one of the key contributors, in allowing the more convenientmethod of construction, eliminating various problems or limitations of construction works, for instances:

1. Structures in which their shape are extremely complicate for vibration, such as Steel CompositedColumn, Sandwiched Composite Box, I - Girder, T - Girder and Lining.

2. Structures with impossibility to be completely finished in a single placing, or with need of a specialconcreting process such as long columns or high walls.

CPAC Self-Compacting Concrete, The Answer to All Varietiesof Needs


CPAC Self-Compacting Concrete Self-flowing from one side to the other of CPAC Self- Compacting Concrete in the repair of honeycombed structure

CPAC Self-Compacting Concrete CPAC Self-Compacting Concrete helps increase the productivity of precast concrete and uses less workers.

3. Structures with complicated and heavily congested steel reinforcement.4. A recovery of honeycombed concrete structure requiring a suitable repairing materials with superb

flowability.5. Structures with requirement of smooth surface of concrete which will shorten construction time

and lower surface finishing cost.6. Structures with need of high conveniency and high speed of placing.

Smooth surfaces of concrete buildings without surface finishing


Piers of Siam Seaboard Port, Laem Chabang, damaged by ship collision.

(Steel Composited Long Column) steel plate Internal appearance of steel composited long column crossed by steel plate at China Tower, Yaowarat, making vibration is almost impossible.

CPAC Self-Compacting ConcreteCreates High-Quality Work CPAC Self-Compacting Concrete

-


- Complicated and congested reinforcing steel of U-turn structure, a part of Pak Kret - Bang Pa-In expressway.

Some of the projects that have confidentlyused CPAC Self-Compacting Concrete

For complicated structures or congestedreinforcing steel :-

China Tower, Yaowarat Ratchaburi Power Plant Pak Kret - Bang Pa-In Expressway Large Jet Engine Test Cell, Bangkok

International Airport

For structural or strengthening Factory, Rayong Olefin Company Siam Seaboard Port, Laem Chabang Millennium Complex Siam Strip Mill Plant

Tremie 9 . () Self flowing from middle toward wall sides, CPAC Self-Compacting Concrete was used with a tremie process at 9 m. high wall of the Ratchaburi Power Plant, leaving a perfectly compacted concrete matrix without any segregation.

self compacting concrete

Documents