Specification and guidelines for selfcompacting concrete efnarc. Mix design plays an imperative function in civil construction projects. It is used in the construction where it is hard to use vibrators for consolidation of concrete. The higher powder contents increase cohesiveness and segregation resistance at high filling abilities. How to merge pdfs and combine pdf files adobe acrobat dc. If the scc mixture is designed to have a higher paste content or fines compared to conventional concrete, an increase in shrinkage may.
The european guidelines for selfcompacting concrete. Formwork pressure when scc is at rest, a high viscosity reduces formwork pressure segregation resistance. Powdertype scc scc mixes that rely on high amounts of powders in the mix to meet scc performance requirements. When using type ip or sm blended cement in class dp and hp concrete, an addition of microsilica 71111 is required. Due to the highly fluid nature of agilia, these concretes do not require vibration and provide a beautiful final surface finish, helping to contribute to reduced construction time and costs on your project. The scc files contain the source code that is used to manage local copies of projects that are under source control.
Objectives development of a selfconsolidating concrete mixtures so that concrete placement can be made into steel plate composite sc modular structures without the need for continuous concrete placement. Selfconsolidating concrete scc, also referred to as selfcompacting concrete, is able to flow and consolidate on its own. Also known as selfcompacting concrete scc s elf consolidating concrete. Flat slab analysis, design and detailing pdf civil. The approach was used to assess segregation of scc cylinders made from scc used in the north kahana bridge project trial shafts. Self compacting concrete for high performance structures. Based on above results conclusions are drawn and discussions the following self compacting concrete scc technology can save time, cost, enhance quality, durability and moreover it is a green concept. File or submit business entity documents for new and existing businesses. Selfconsolidating concrete scc is a highly flowable, nonsegregating concrete that spreads into place, filling and covering even the most reinforcement congested formwork without any mechanical vibration. Mix design for self compacting concrete or scc cannot be conducted directly because there are many control parameters in its rheological properties. With the aim of obtaining the accurate measurement of any construction site, the usage of this userfriendly concrete mix design spreadsheet is absolutely necessary. Scc concrete, also known as self consolidating concrete and self compacting concrete is a highly flowable, nonsegregating concrete that spreads into place, fills formwork, and surrounds even the most congested reinforcement, without the use of any mechanical vibration. Use of fiberreinforced scc for the repair of reinforced.
Mix design of self compacting concrete based on ultra high. In this project, the scc was mixed onsite and pumped through a piping system to the specified point, located 200 meters away. Click, drag, and drop to reorder files or press delete to remove any content you dont want. Ganesana et al 2 investigated rice husk ash blended cement. Self consolidating concrete scc, also known as self compacting concrete, is a highly flowable, nonsegregating concrete that can spread into place, fill the formwork and encapsulate the reinforcement without any mechanical consolidation. Self consolidating high performance concrete scc self. Certain states in which we operate have statutes addressing tobacco usage, including smoking, and mdu resources group, inc. Scc mixtures can be designed to provide the required hardened concrete properties for an application, similar to regular concrete. This clerks information system cis is the property of the state corporation commission scc of the commonwealth of virginia. Selfconsolidating concrete or selfcompacting concrete commonly abbreviated to scc is a concrete mix which has a low yield stress, high deformability, good segregation resistance prevents separation of particles in the mix, and moderate viscosity necessary to ensure uniform suspension of solid particles during transportation, placement without external compaction, and thereafter until. Selfcompacting concrete scc is a key innovation in concrete technology and it is truly remarkable that, even after almost 30 years since its first implementation, it still attracts the interest. It is not an allencompassing document but is an introduction to the subject providing general information. Selfconsolidating concrete, also known as selfcompacting concrete scc, is a highly flowable, nonsegregating concrete that spreads into place, fills formwork, and encapsulates even the most congested reinforcement, all without any mechanical vibration. Prospec selfconsolidating concrete mix scc ci is a dry, preblended, onecomponent, self consolidating, cementitious, polymermodified concrete mix containing coarse aggregate, silica fume, and an integral migrating corrosion inhibitor.
Technical bulletin consolidating concrete scc tb1500 an. Selfcompacting concrete scc is a flowing concrete mixture that is able to consolidate under its own weight. Rheology is the science of the deformation and flow of materials. Selfcompacting concrete with limestone powder for transport. Selfconsolidating concrete for sc modular structures. Admixture experts and precasters provide important tips to work successfully with selfconsolidating concrete scc. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Self compacting concrete scc mix design must involve key practices to achieve the requirements of quality and durable mix. The information in this document is expected to inform concrete producers, users, and specifiers of scc of known practices and processes.
Thixotropy of scc and its effects on formwork pressure. A simple tool for self compacting concrete mix design. Inspection manual for selfconsolidating concrete in. Based on the requirements of each project, scc concrete designs can be submitted by the producer only after specification provisions regarding the performance of the concrete in its plastic and hardened state are clearly defined. Selfcompacting concrete scc, or selfconsolidating concrete in usa, is a segregationfree concrete although it is so fluid that it can completely fill any area of the formwork in the absence of any compaction effort. Therefore, the differences between scc and conventionally placed concrete are related to workability and to the changes in materials and mixture proportions required to achieve scc workability. Development of scc self compacting concrete scc developed by professor hajime. Phase i involves collecting actual field scc mixes that were used for casting nonstructural concrete components such as tee walls and noise walls. Meets astm specification c 1621 and c 1621m06 standard test method for passing ability of selfconsolidating concrete by jring. Because scc is a viable solution to various concrete placement problems, astm has established subcommittee c09. 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. Concrete international flowing or selfconsolidating concrete q.
Dambrosia ctl group lin shen kal krishnan consulting services, inc. The selfcompacting concrete european project group was founded in. The paste is composed of cement, water, and entrained air and ordinarily constitutes 20 to 40 percent of the total volume. Best practices guidelines for selfconsolidating concrete. Preset timethe time required to reach a degree of stiffening of concrete equal to a strength of 3. The responsible division is identified in the plan title block, and good quality printed versions of the file may be used statewide in plan sets without being signed. At the same time it is cohesive enough to fill spaces of almost any size and shape without segregation or bleeding. Vmar 3 works by increasing the viscosity of the concrete while still allowing the concrete to flow without segregation. Selfconsolidating concrete agilia is a range of self consolidating concretes. Scc jring test set scc self consolidating concrete. Jobtask analysis jta for aci selfconsolidated concrete testing technician certification 11918 a 612. The benefits of scc in reduced labor needs, increased rate of production and safety, and lower noise levels have generated great interest from the precast concrete industry. Feb 27, 2014 based on above results conclusions are drawn and discussions the following self compacting concrete scc technology can save time, cost, enhance quality, durability and moreover it is a green concept. A civil engineer must know all the aspects regarding the flat floor system.
Best practices guidelines for selfconsolidating concrete 3 what is selfconsolidating concrete. The mix designed as per the requirements are tested before using it in construction. Accelerated slab replacement using temporary precast panels. Accelerated slab replacement using temporary precast panels and selfconsolidating concrete scc jamshid armaghani, ph. If the scc mixture is designed to have a higher paste content or fines compared to conventional concrete, an increase in shrinkage may occur. Is flowing concrete the same as selfconsolidating concrete.
Materials, properties and applications presents the latest research on various aspects of selfcompacting concrete, including test methods, rheology, strength and durability properties, scc properties at elevated temperature, sc manufacturing with the use of scms, recycled aggregates and industrial byproducts. Self consolidating concrete overview of scc the concrete. Abstract the goal of the project was to develop a new type of selfconsolidating concrete scc for slipform paving to simplify construction and make smoother pavements. Pdf flowing concrete fc and selfcompacting concrete scc are currently produced with sufficient amount of superplasticiser. Selfconsolidating concrete scc was developed in japan in 1987 and although it took time to reach north america, this amazing product has rapidly gained acceptance. Introduction to concrete portland cement association. These materials are originally located at different websites. Type ip or sm blended cement replaces the portland cementpozzolan portion of the designed mix in class dp, g, gg, or hp concrete. Selfcompacting concrete applications and advantages. Scc concrete selfconsolidating concrete mixes a very. Scc is the new kind of selfcompactable concrete with excellent deformability and segregation resistance.
Part 2 details test methods and troubleshooting based on a recent npca white paper from scc industry experts. Designed for application thickness minimum of 1 in. In the mix design of scc, the relative proportions of key components are generally. Consolidating concrete scc technical bulletin selfconsolidating concrete scc is a rapidly developing research area with literally hundreds of published papers. In addition, laboratory mixes were also made to evaluate the mechanical.
Introduction to concrete concretess versatility, durability, sustainability, and economy have made it the worldss most widely used construction material. Pdf selfcompacting concrete procedure for mix design. Powdertype sccscc mixes that rely on high amounts of powders in the mix to meet scc performance requirements. The main characteristics of scc is the higher cement matrixaggregate ratio with respect to an ordinary concrete. Only persons authorized by the scc are permitted to access and use the cis. Difference between self compacting and normal concrete. Self compacting concrete materials, properties and tests. Components of concrete concrete is made up of two components, aggregates and paste. Here the differences between scc and normal concrete in terms of different fresh state properties, mix composition and long term properties are explained in the below section. The selfcompacting concrete european project group was. You can file concrete to give it a more finished appearance, smooth out rough edges or even to create artistic sculptures. One of the most remarkable projects built using selfcompacting concrete is the akashikaikyo suspension bridge. Working with scc neednt be hit or miss precast concrete. The concrete community of various european countries intensely researches its application and implements experiences.
This oftenupdated app combines a large number of pdf files from your android device, as well as many other useful features. Introduction the concept of self compacting concrete scc was. Only the abstract and conclusions from this report are included herein, and the reader is referred to the original report available online for further details of this. Cost analysis showed that the cost of ingredients k. The utilisation of selfcompacting concrete scc is growing rapidly. Part 1 of this twopart series covered selfconsolidating concrete scc characteristics, aggregates, equipment and instructions for conducting a plantspecific costbenefit analysis precast inc.
It is defined as a concrete mix that can be placed purely by means of its own weight. This specification and guideline utilises efnarcs broad practical experience with scc to provide a framework for design and use of high quality scc. It is a complex discipline used to understand the workability characteristics of scc. In all scc mixes compressive strengths of standard cube specimens were comparable to those of traditional vibrated concrete made with similar water cement ratios if anything strengths were higher. Basic functionality is available without a fee, while an adfree experience can be had with inapp purchases. Pdf selfcompacting concrete scc is a key innovation in concrete technology and it is truly remarkable that, even after almost 30 years. In 1983, only about 8 percent of all precast products used scc, but by 2005 that number had increased to 33 percent.
Selfconsolidating concrete scc is recognized as one of the greatest advances in the concrete industry. Struble university of illinois at urbanachampaign matthew d. The main difference between the workability of scc and conventionally placed concrete is the ability of scc to flow and consolidate under its own mass. It can fill the mould and heavily reinforced section without need of any vibration and compaction. Some precasters report that working with selfconsolidating concrete scc can be a hit or miss affair. The mix designed as per the self compacting concrete mix design must involve key practices to achieve the requirements of quality and durable mix. The compressive strengths developed by the scc mixes with rha were comparable to the control concrete. The euclid chemical company 19215 redwood road cleveland, oh 44110 8003217628 eucorepair scc is a pourable and pumpable selfconsolidating concrete repair mortar that can be placed from 1 inch 2. Since the concrete is capable of selfconsolidating and reaching the difficult areas in moulds, manual variables in terms of placing and.
Generally when filing concrete, you should use a rasp instead of a regular file because the larger teeth or grit on the rasp are better suited to the rough texture of the concrete. Scc concrete is usually defined as having a spread of 18 to 30 inches wide, making it possible to place concrete under difficult conditions. Selfcompacting concrete has been used in bridges and even on precast sections. Filling and passing ability, segregation resistance are the properties of self compacting. Selfcompacting concrete scc was founded in 1986, from these days until now its used profusely due to its different features like one of them the sustainability by using the waste materials. About four tons of concrete are produced per person per year worldwide and about 1. Using new admixtures and some mix modifications, we can now produce concrete that flows easily without segregating where the coarse aggregate separates from the cement paste.
The forney jring test set contains everything you need to determine the ability of scc mixtures to flow around rebar and other reinforcing structure in concrete forms. Vmar 3 is a high efficiency, liquid admixture designed to enable production of selfconsolidating concrete scc by modifying the rheology of concrete. You can merge pdfs or a mix of pdf documents and other files. Click add files and select the files you want to include in your pdf. Due to thixotropy, concrete exhibits higher viscosity when at rest than when flowing. This is increasingly used where horizontal element floor and vertical elements walls are constructed using concrete only. This report summarizes the twophase research on selfconsolidating concrete scc in new jersey. Although the terms flowing and selfconsolidating concrete scc are used interchangeably by some people, they actually are different forms of highly flowable concrete. Special test devices called rheometers conventional mix scc mix. Selfcompacting concrete scc may lead to evolution of a more quality controlled concrete, assuring a better workability and avoiding human errors with regard to mixing and workability issues.
Selfconsolidating concrete for sc modular structures monday, october 17, 2016 amm workshop germantown, md objectives development of a selfconsolidating concrete mixtures so that concrete placement can be made into steel plate composite sc modular structures without the need for continuous concrete placement cold joint. Pdf scc can be made from any of the constituents that are generally used for structural concrete. For the most part, hardened concrete properties of scc are similar to conventional concrete mixtures. This file is created when a user performs a get operation. Txdot divisions maintain statewide electronic master files. How to combine pdf files into one document lifewire. Mix design requirements for self compacting concretescc. The most important requirement for scc is high flowability without the segregation of aggregate during placement. Self compacting concrete scc can be defined as fresh concrete that flows under its own weight and does not require external vibration to undergo compaction. The highly fluid nature of scc makes it suitable for placing in difficult conditions and in sections with congested reinforcement.
Despite some limitations in the free edition of this app, including a maximum file size of 2. Txdot provides computeraided drawing cad standard plan files that may be used as follows. Selfconsolidating concrete construction for modular units. Field measurements of form pressure exerted by self. Effect of rice husk ash on fresh and hardened properties of. Selfconsolidating concrete applications for slipform. The utilisation of selfcompacting concrete scc is growing. The term concrete refers to a mixture of aggregates, usually sand. Self compacting concrete has left his early stage of laboratory studies and has now become an industrial product.1621 924 95 505 684 861 962 457 924 1504 513 1120 1513 416 1573 1684 1008 1670 400 225 953 877 617 1088 1461 138 87 923 376 1186 473 403 954