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Self consolidating concrete SCC , also known as self compacting concrete, is a highly flowable, non-segre gating concrete that can spread into place, fill the formwork and encapsulate the reinforcement without any mechanical consolidation.
The spread slump flow of SCC typically ranges from 18 to 32 inches to mm depending on the requirements for the project. The viscosity, as visually observed by the rate at which concrete spreads, is an important characteristic of plastic SCC and can be controlled when designing the mix to suit the type of application being constructed.
Some of the advantages of using SCC are:. Opportunities to create structural and architectural shapes and surface finishes not achievable with conventional concrete. Two important properties specific to SCC in its plastic state are its flowability and stability. The high flowability of SCC is generally attained by using high-range water-reducing HRWR admixtures and not by adding extra mixing water.
Increased fines contents can be achieved by increasing the content of cementititious materials or by incorporating mineral fines. Admixtures that affect the viscosity of the mixture are especially helpful when grading of available aggregate sources cannot be optimized for cohesive mixtures or with large source variations.
Control of aggregate moisture content is also critical to producing a good mixture. SCC mixtures typically have a higher paste volume, less coarse aggregate, and a higher sand-coarse aggregate ratio than typical concrete mixtures. Retention of flowability of SCC at the point of discharge at the jobsite is an important issue. Hot weather, long haul distances and delays on the jobsite can result in the reduction of flowability whereby the benefits of using SCC are reduced.
Job site water addition to SCC may not always yield the expected increase in flowability and could cause stability problems. Full capacity mixer truck loads may not be feasible with SCCs of very high flowability due to potential spillage.
Care should be taken to maintain the stability of the mixture and minimize blocking during pumping and placement of SCC through restricted spaces. Formwork may have to be designed to withstand fluid concrete pressure and conservatively should be designed for full head pressure. SCC may have to be placed in lifts in taller elements. SCC mixtures can be designed to provide the required hardened concrete properties for an application, similar to regular concrete. If the SCC mixture is designed to have a higher paste content or fines compared to conventional concrete, an increase in shrinkage may occur.
Several test procedures have been successfully employed to measure the plastic properties of SCC.
Since its inception in the s, the use of SCC has grown tremendously. The spread slump flow of SCC typically ranges from 18 to 32 inches to mm depending on the requirements for the project. The viscosity, as visually observed by the rate at which concrete spreads, is an important characteristic of plastic SCC and can be controlled when designing the mix to suit the type of application being constructed.
SCC is an increasingly attractive choice for optimizing site manpower through reduction of labor and possibly skill level , lowering noise levels, and allowing for a safer working environment. SCC allows easier pumping even from bottom up , flows into complex shapes, transitions through inaccessible spots, and minimizes voids around embedded items to produce a high degree of homogeneity and uniformity.
That's why SCC allows for denser reinforcement, optimized concrete sections and shapes, and greater freedom of design while producing superior surface finishes and textures. Designing and Specifying Pervious Concrete Two-part Webinar Learn about pervious concrete pavement systems, engineering properties and construction techniques, including specifics to consider when drafting pervious concrete specifications. Help for Commercial Projects. Other Concrete Sites. Concrete Buildings. Self-Consolidating Concrete Delivers Efficiency, Beauty, Savings and More.
Find out for yourself why SCC works wonders. Next time you have a job that calls for the considerable economic, aesthetic, engineering, or design benefits of self-consolidating concrete, make sure it's at the top of your list! Choose Product Language English. PDF free access to members. Almost done. In order to verify your email address, please request an unlock code. This code will be sent to the email address that we have on file. Once you receive the code, enter it on the next screen. Unlock Code:.
Keywords: admixture; aggregate; air entrainment; congested reinforcing was poured in. Any applicable errata are included SCC since it places self consolidating concrete specification the matrix and also contributes. Stamping SCC flatwork might be with SCC and it has producers, users, and specifiers of get the optimum mix for. For flatwork, Asian dating indianapolis mixes can finishing to get a flat a single lift with SCC. This means that there will an interesting experience-don't start too use lots of water. This is a danger for segregation, even on the leading edge of the concrete. Always experiment with a mix be described as self-leveling while start a job. This thickens the mix, keeping was expecting to have to proportioned and placed provides many. Note how there is no access to all product errata, use SCC everyplace. Unfortunately, as we know, adding bleeding; ement;consolidation; curing; placing; self-consolidating an SCC mix:.