SEMINAR CIVIL ENGINEERING DEPT. PSIT COE KANPUR TOPIC “SPECIAL TYPES OF CONCRETE” BY-ANKIT SRIVASTAVA

. Concrete is the second most consumed substance on earth. The relation between a doctor and medicine is same as to the relation between a civil engineer and concrete. The making of concrete is an art as well as a science.

special TYPES OF CONCRETE 1.TRANSLUCENT CONCRETE 2.GREEN CONCRETE 3.GEO-POLYMER CONCRETE 4.BACTERIAL CONCRETE 5.BENDABLE CONCRETE 6.VACUUM CONCRETE 7.CELLULER CONCRETE 8.PERVIOUS CONCRETE

TRANSPARENT/TRANSLUCENT CONCRETE 1.It Has The “Light Transmissive Property "which Is Mainly Due To The Uniform Distribution Of High Numerical Aperture Plastic Optical Fiber (POF) Throughout Its Body. 2.Basic Material Are Fine Aggregate,Cement And POF. 3.It Has very Good Architectural Property For Giving Good Aesthetical view To Building. 4.Costly Because Of Optical Fiber And Skilled Labour. 5.Used where sunlight does not reach properly.

1.The transparent concrete does not loose strength parameter when compared to regular concrete. 2.It is ecofriendly because it saves electricity during day (the sun light passes through it and create brightness.) 3.It is made in mould using Portland cement and optical giber as reinforcement..

GREEN CONCRETE Concrete which is made from concrete wastes that are eco-friendly are called as “Green concrete". It Uses Less Energy In Production And Produce Less C02

Materials for Green Concrete Coarse Aggregates are: Coarse Aggregates are: 1.Fresh local aggregate 3. recycled demolition waste 2.Recycled Concrete Material (RCM) 4. blast furnace slag (BFS)

Materials for Green Concrete Fine aggregates 1.Manufactured sand for cement 2. recycled glass aggregate 4.Blast furnace slag 3. fly ash

ADVANTAGE 1.Easier Handling, 2.Green Concrete Uses Local And Recycled Materials In Concrete. 4.The Heat Of Hydration Of Green Concrete Is Significantly Lower Than Traditional Concrete. 5. No Environmental Pollution And Sustainable Development. 6. Flexural Strength And Compressive Strength Is Equal To The Conventional Concrete.

GEO POLYMER CONCRETE. Geopolymer cement concrete is made from utilization of waste materials such as fly ash and ground granulated blast furnace slag(GGBS). Fly ash is the waste product generated from thermal power plant and ground granulate blast furnace slag is generated as waste material in steel plant. Use of geopolymer reduces the demand of Portland cement which is responsible(5%) for high CO 2 emission.

OPC vs GEO POLYMER 1.Geopolymer concrete (GPC) using “fly ash” 2.Greater corrosion resistance, 3.Substantially higher fire resistance (up to 2400° F), 4.Greenhouse gas reduction potential as much as 90 percent when compared with OPC.

PREPRATION Aggregate Fly ash Alkaline activator (NaOH + Na Silicate) Geopolymerisation Storage

Bacterial concrete or self healing concrete 1.Self-healing concrete is a result of biological reaction of non-reacted limestone and a calcium based nutrient(Calcium Lactate) with the help of harmless bacteria (Bacillus) to heal the cracks appeared on the building. 2.It fills up the cracks developed in structures by the help of bacterial reaction in the concrete

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BEndable concrete 1.It Is Special Type Of Concrete That Can Take The Bending Stresses. It Consist Of Special Type Of Materials That Makes It Flexible. Its Engineering Name Is Engineered Cementitious Composite(ecc). It Exhibits The Property Of A Ductile Material Instead Of A Brittle Material Which Is Shown By The Conventional Concrete.Composite

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. 1. It has the ability to bend like a metal 2.The use of steel reinforcement is reduces and can be eliminated.steel 3.It has a high initial cost and less compressive strength as compared to conventional concrete. Material used 1.Fiber reinforcement 1.Superplasticizer 2.Fine sand

PERVIOUS CONCRETE OR NO FINE CONCRETE Pervious concrete uses the same materials as conventional concrete, with the exceptions that the fine aggregate typically is eliminated entirely, and the size distribution (grading) of the coarse aggregate is kept narrow, allowing for relatively little particle packing. It allows water from precipitation and other sources to pass directly through, thereby reducing the runoff from a site.

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. Aggregate, Little To No Fine Aggregate, And Insufficient Cement Paste To Fill Voids In The Coarse Aggregate. Produces A Concrete With A High Volume Of Voids (20% To 35%) Pervious Concrete Is Used In Hydraulic Structures As Drainage Media, And In Parking Lots, Pavements Pervious Concretes Have Also Been Used In Tennis Courts And Greenhouses. Drainage Rates Commonly Range From 100 To 900 Lit.Per Minute Per Square meter.

Vacuum concrete Vacuum concrete is the type of concrete in which the excess water is removed for improving concrete strength. The water is removed by use of vacuum mats connected to a vacuum pump. In this technique, the excess water after placement and compaction of concrete is sucked out with the help of vacuum pumps. This technique is effectively used in industrial floors, parking lots and deck slabs of bridges etc.

. Technique and Equipment for Vacuum Concrete: The main aim of the technique is to extract extra water from concrete surface using vacuum dewatering. As a result of dewatering, there is a marked reduction in effective water-cement ratio and the performance of concrete improves drastically. The improvement is more on the surface where it is required the most. Mainly, four components are required in vacuum dewatering of concrete, which are given below: Vacuum pump Water separator Filtering pad Screed board vibrator

Cellular concrete Cellular Lightweight Concrete (CLC) also known as Foamed concrete is one of the most significant type of concrete used for construction purposes due to its various advantages and usages over traditionally produced concrete. Foamed concrete is manufactured by mixing Portland cement, sand, fly ash, water and preformed foam in varied proportions. Cellular lightweight concrete can be produced at building sites using machines and molds devised for normal concrete at ambivalent conditions.

. Advantages of Cellular Lightweight concrete: Lightweight Fire resistant Thermal insulation Sound absorption and Acoustical Insulation Environmental Friendly Cost-efficient Termite proof and resistant towards freezing issues. Important constituents of cellular lightweight concrete are: 1.Foam, 1.Fly ash, and 3.Cement

APPLICATION Cellular lightweight concrete is utilized as thermal insulation in the form of bricks and blocks over flat roofs or non-loading walls. Bulk filling by applying relatively low strength material for old sewer pipes, wells, unused cellars and basements, storage tanks, tunnels and subways. Production of heat-insulated light wall panel. Maintain Acoustical balance of concrete. Manufacture cement and plaster-based light plate. Application in the bridge to prevent freezing. Utilized for tunnel and shaft filling and lightweight concrete manufacturing.

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