Most of the differences shown by scc is due to this variation of flowability from the normal concrete. What are the advantages and disadvantages of concrete cover. Self compacting concrete properties life science journal. The paper presents the results of studies of a total of 11 series of self compacting concrete, which were modified with different amounts of the following nanoparticle additives. A concrete mix can only be classified as self compacting concrete if the requirements for all the following three workability properties are fulfilled. Self consolidating concrete scc is recognized as one of the greatest advances in the concrete industry. Self compacting 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. Selfcompacting concrete is a nonsegregating concrete that is placed by means of its own weight. Self compacting concrete materials, properties and tests. Due to its properties and composition, the self compacting concrete is described here as being one of the future. The roads having their wearing surface consisting of cement concrete plane or reinforced are known as cement concrete roads or concrete roads. Scc can be placed easily in complicated formwork and dense reinforcement. Pdf selfcompacting concrete procedure for mix design. Test method for passability through spaces using ushaped or boxshaped apparatus test method for self compactability 1.
A mobile mixer can be used for different projects and a solution to many problems. Difference between self compacting and normal concrete. This research paper aims to perform a benefit cost analysis of self compacting concrete and list down the process and criteria of selection of scc. It is an innovative concrete mixture that can be mold into place without the use of vibrators to form a product free of empty spaces within the formwork. Cip 37 self consolidating concrete scc 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. Self compacting concrete and admixtures 23rd march 2010 14th march 2016 self compacting concrete is a type of concrete that is highly fluid allowing it to self level, penetrate into complicated areas and formwork, through complex reinforcement and much more. The use of self curing admixtures may be very crucial from the point of view that saving of water is a necessity every day every one cubic meter of concrete calls for 3m3 of water in a construction, most of thats used for curing. Materials, properties and applications presents the latest research on various aspects of self compacting 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 compacting concrete is a highperformance concrete which is highly flowable or selfleveling cohesive disadvantayes that can be easily placed in the tight reinforcement. Advantages and disadvantages of self compacting concrete. Selfcompacting concrete procedure for mix design from. Ordinary portland cement either 43 or 53 grade cement can be used. I have used high range water reducing superplasticiser pce based for production of m40 grade concrete for mass concreting as well as slipform work. Self consolidating concrete scc, also referred to as self compacting concrete, is able to flow and consolidate on its own. If we dont expel this air, it will result into honeycombing and reduced strength. The weight of compared is high compared to its strength. Self compacting concrete by s and corneliu bobliana iure abstract. Development of scc self compacting concrete scc developed by professor hajime okamuraof kochi university of technology, japan, in1986 during his research, okamura found that the main cause of the poor durability performances of japanese concrete in structures was the inadequate compacting of the. Selfcompacting concrete is a fluid mixture suitable for placing in structures with congested reinforcement without vibration. Self compacting concrete is a highperformance concrete which is highly flowable or selfleveling cohesive concrete that can be easily placed in the tight reinforcement. 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.
Due to its properties and composition, the selfcompacting concrete is described here as. The importance of selfcompacting concrete is that maintains all concretes durability and characteristics. Use and benefits of self compacting concrete construction cost. Filling and passing ability, segregation resistance are the properties of self compacting. It uses super plasticisers and stabilizers to significantly increase the ease and rate of flow. It can also help in drafting guidelines for the selection of self compacting concrete. The european guidelines for self compacting concrete 1 introduction self compacting concrete scc is an innovative concrete that does not require vibration for placing and compaction.
Best practices guidelines for self consolidating concrete 3 what is self consolidating concrete. Selfcompacting concrete procedure for mix design article pdf available in leonardo electronic journal of practices and technologies 712 june 2008 with 34,769 reads how we measure reads. If the scc mixture is designed to have a higher paste content or fines compared to conventional concrete, an increase in shrinkage may occur. Methods of testing self compacting concrete workability. The seminar report on selfcompacting concrete which explains the mix design, advantages and disadvantages, applications, properties,process of making selfconsolidating concrete, theoretical and experimental studies with test results. Placing and curing selfcompacting concrete in hot climates carlos f. Further development of latest generation concretes in the recent past needs to update knowledge on the behaviour of such concrete with the addition of fibres to make them more efficient and effective. Scope this standard covers the test method for passability through spaces of self compacting concrete. Concrete that is capable of compaction under its own weight and can occupy all the spaces in the forms, which self levels, does not segregate and does not entrap air is termed self compacting concrete scc. Advantages and disadvantages of concrete civil engineering. Paratibha aggarwal 1, rafat siddique 2, yogesh aggarwal 1, surinder m gupta 1. Selfcompacting concrete applications and advantages. May 29, 2019 these are some of the disadvantages of concrete. Selfcompacting concrete development must ensure a good balance between deformability and stability.
Due to its properties and composition, the selfcompacting concrete is described here as being one of the future. One of the disadvantages of selfcompacting concrete is that it can be quite costly. Also, compactibility is affected by the characteristics of materials and the mix proportions. The hardened concrete is dense, homogeneous and has the same. Best practices guidelines for selfconsolidating concrete. In this examine, compressive energy and break up the tensile power of concrete containing self curing agent is. A measure of the ease by which fresh concrete can be placed and compacted. At the same time it is cohesive enough to fill spaces of almost any size and shape without segregation or bleeding. Self compacting concrete scc is a flowing concrete that does not require vibration and, indeed, should not be vibrated. Jun 24, 2019 after 28 days of curing specimens were taken and allowed to dry and tested in compressive strength testing machine. It has been found from the experimental studies that 1% air in the concrete approximately reduces the strength by 6%.
The main ingredients used in design of self compacting concrete are. Selfcompacting concrete procedure for mix design paratibha aggarwal, rafat siddique, yogesh aggarwal, surinder m gupta concrete that can flow under its own weight through restricted sections without segregation and bleeding. Self consolidating concrete, also known as self compacting concrete a highly flowable, nonsegregating concrete that can spread in place, fill formwork and encapsulate the reinforcement without any mechanical consolidation. Self compacted concrete is highly engineered concrete with much higher fluidity without segregation and is capable of filling every corner of formwork under its self weight. Standard test methods for selfcompacting concrete i. Sarker, flexural strength and elastic modulus of ambientcured blended lowcalcium fly ash geopolymer concrete. As a soundproofing material cinder concrete could be used. Also, compactibility is affected by the characteristics. High deformability of mortar and concrete self compacting concrete. Shotcrete is a mortar or concrete which is pneumatically projected or sprayed by a nozzle with high velocity on the prepared surface. Scc self compacting consolidating concrete forfair facedconcrete crc compact reinforcedcomposite high strength material forslender structures grc glassfiber reinforcedconcrete 9112012 disadvantages of precast structures.
Jan 19, 2018 self consolidating concrete alias self compacting concrete scc is a concrete mixture that can flow into very complex forms with various reinforcing bars rebar congestion and leaves no voids. There are two things present in self healing concrete. Using selfcompacting concrete produce several benefits and advantages over regular concrete. This concrete can flow and also to pack probably the most restricted spots of the framework with no vibration. Has very low tensile strength, which can be counteracted by the reinforcement of a steel rebar reinforced concrete is a heavy material, therefore, it cannot span long distance is a brittle mat. 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.
Standard test methods for self compacting concrete i. One such latest generation concrete is self compacting concrete scc. Thus concrete roads are also considered as all weather roads. Jun 17, 2019 selfconsolidating concrete is a highly flowable type of concrete that spreads into the form without the need for mechanical vibration. It consists of cement, coarse and fine aggregates, water, mineral and chemical admixtures. Shotcrete or guniting advantages and disadvantages. Self compacting concrete, cement concrete, selection process, benefitcost. Selfcompacting concrete by s and corneliu bobliana iure abstract.
Sio 2, tio 2 and al 2 o 3, and also a reference concrete without the addition of nanoparticles. These roads are types of rigid pavements and remain in serviceable condition under all weather conditions. Explore self compacting concrete with free download of seminar report and ppt in pdf and doc format. Scc mixtures can be designed to provide the required hardened concrete properties for an application, similar to regular concrete. The concrete was cast along the entire lengths of the walls to avoid construction joints. Also explore the seminar topics paper on self compacting concrete with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2015 2016. It is super workable due to its low watercement ratio, which gives rapid strength. Selfcompacting concrete versus normal compacting concrete. When it is mixed with other forms of concrete it can break down over time. Study on properties of selfcompacting concrete modified with. It is the ability of scc to flow into all spaces within the formwork under its own weight.
What are disadvantages of selfcompacting concrete answers. An idea of self compacting concrete, a substance which passes, thats placed into framework and compressed under influence of self weight only, with. The european guidelines for self compacting concrete. Cemflow is a range of highly specialised self compacting readymixed concrete formulations, each presenting significant advantages over equivalent traditional concrete. Self consolidating high performance concrete scc self. Geometrical requirement of aggregates as per european standards pdf. One of the disadvantages of self compacting concrete is that it can be quite costly. Self consolidating concrete overview of scc the concrete. The ingredients for self compacting concrete are similar to conventional concrete. The materials, tests and properties of self compacting concrete are explained in the below sections. Compared to other binding materials, the tensile strength of concrete is relatively low.
Admixtures as in chemical admixtures are of 2 types mainly, viz pce based and naphtha based. One of the key differences between the selfcompacting concrete scc and normal cement concrete ncc is the flowability property of scc by its on weight. Thus scc eliminates the vibration for the compaction of concrete without affecting its engineering properties. Scc requires high fluidity in tight joints formwork, which slow downs the casting rate. Project report study on self compacting concrete using. Selfcompacting concrete scc for prestressed bridge girders. The most important aspect that a mobile mixer can bring is the flexibility of always having fresh concrete onsite by the time you need it. Self compacting concrete scc advantages and disadvantages self compacting concrete scc advantages and disadvantages self compacting concrete.
Self consolidating concrete, also known as self compacting 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. It is commercially known by various names such as self consolidating concrete, self compacting concrete, self leveling concrete, or rheoplastic concrete mehta and monteiro 2006. Self healing concrete is also know as bio concrete or bacterial concrete. Pdf the paper presents the characteristics of the selfcompacting concretes, their advantages and disadvantages when they are used in buildings. The paper presents the characteristics of the self compacting concretes, their advantages and disadvantages when they are used in buildings. Cement concrete roads advantages and disadvantages. Self compacting concrete seminar report, ppt, pdf for. By the early 1990s, japan has developed and used scc.
Six precast prestressed bridge girders were cast using four scc and two conventional concrete mixes. Self compacting concrete scc advantages and disadvantages self compacting concrete. Aug 06, 20 cemflow is a range of highly specialised self compacting readymixed concrete formulations, each presenting significant advantages over equivalent traditional concrete. Selfcompacting concrete with a similar water cement or cement binder ratio will usually have a slightly higher strength compared with traditional vibrated concrete, due to the lack of vibration giving an improved interface between the aggregate and hardened paste. Mar 16, 2016 o self compacting concrete is an innovative concrete that does not require vibration for placing and compaction. Mechanism of achieving self compaction 5 reduction of water. The aggregate restrains the shrinkage of the cement paste and so the higher the volume of the aggregate and the higher the evalue of the aggregate, the lower the drying shrinkage. It is able to flow under its own weight, completely filling formwork and achieving full compaction, even in the presence of congested reinforcement.
Importance of using self compacting concrete construction essay. Such concrete should have a relatively low yield value to ensure high flow. Self compacting concrete scc advantages and disadvantages. Jul 09, 2018 self compacting concrete scc is a flowing concrete that does not require vibration and, indeed, should not be vibrated. An idea of self compacting concrete, a substance which passes, thats placed into framework and compressed under influence of self weight only, with no vibration and also added processing emerged. Compaction is a process of expelling the entrapped air. Concrete that segregates loses strength and results in. It is specially made to increase the life span of the durability of concrete structure by self healing action of that concrete. Self compacting concrete scc can be defined as fresh concrete that flows under its own. It is used in the construction where it is hard to use vibrators for consolidation of concrete.
Strict quality control required to ensure required properties. Self compacting concrete scc is an innovative concrete that does not require vibration for placing and compaction. It can be used in precast applications or for concrete placed on site. Construction of precast reinforced concrete structures.
It can be arranged with its own weight devoid of any mechanical vibration. Cip 37 self consolidating concrete scc 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. Download the latest pdf and ppt on slideshare for civil projects. The paper presents the characteristics of the selfcompacting concretes, their advantages and disadvantages when they are used in buildings. Different methods of concrete compaction there are two methods. Self compacting concrete seminar report, ppt, pdf for civil.
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