Specification and Guidelines Self compacting concrete and self consolidation concrete

Definition of Self compaction of concrete (SCC):

Self compacting concrete (SCC) is a flowing concrete mixture that is able to consolidate under its own weight. The highly fluid nature of SCC makes it suitable for placing in difficult conditions and in sections with congested reinforcement. Use of SCC can also help minimize hearing-related damages on the worksite that are induced by vibration of concrete. Another advantage of SCC is that the time required to place large sections is considerably reduced.

It  has proved beneficial economically because of a number of factors, including: 

• Faster construction 
• Reduction in site manpower 
• Better surface finishes 
• Easier placing 
• Improved durability 
• Greater freedom in design 
• Thinner concrete sections 
• Reduced noise levels, absence of vibration 
• Safer working environment 

Fibers:

Fibers used in SCC shall comply with EN XXXX (European standard – in preparation). Commonly used types of fibers are steel or polymer. Fibers may be used to enhance the properties of SCC in the same way as for normal concrete. Steel fibers are used normally to enhance the mechanical characteristics of the concrete such as flexural  strength and toughness. Polymer fibres may be used to reduce segregation and plastic shrinkage, or to 

increase the fire resistance. Ease of mixing and the placing processes proposed, shall be demonstrated  by site trials to the approval of the engineer. 

Application area: 

SCC may be used in pre-cast applications or for concrete placed on site. It can be manufactured in a site batching plant or in a ready mix concrete plant and delivered to site by truck. It can then be placed either by pumping or pouring into horizontal or vertical structures. In designing the mix, the size and the form of the structure, the dimension and density of reinforcement and cover should be taken in consideration. 

These aspects will all influence the specific requirements for the SCC. 

Due to the flowing characteristics of SCC it may be difficult to cast to a fall unless contained in a form. 

SCC has made it possible to cast concrete structures of a quality that was not possible with the existing concrete technology. 

List of tests:

 1 Slump-flow by Abrams cone Filling ability 

 2 T50cmslumpflow Filling ability 

 3 J-ring Passing ability 

 4 V-funnel Filling ability 

 5 V-funnel at T5minutes Segregation resistance 

 6 L-box Passing ability 

 7 U-box Passing ability 

 8 Fill-box Passing ability 

 9 GTM screen stability test Segregation resistance 

 10 Orimet Filling ability 

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