Hydration of cement - SlideShare
Hydration is the reaction (Series of chemical reactions) of cement with water to form the binding material (C-S- H Gel). 4. Structure of 1.4 nm tobermorite, a sheet like silicate composed of octahedral layers and silicate chains. The silica tetrahedra can be replaced by hydroxil ions. If part the bridging tetrahedra (B) are replaced only paired ...
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Placing and compaction of cement concrete
There are three types in this compaction process 1.Roding 2.Ramming 3.Tamping. 10. 1. Rodding A single steel rod is used for pocking the fresh Concrete. 2. Ramming A flat metal piece attached to a hammer is used …
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types of cement and their uses ppt - ST Engineering
types of cement and their uses ppt 1. Natural Cement. Natural Cement is manufactured from crushed stone, with 20 to 40% clay content and remaining lime. mixed carbonate magnesia. It holds brown in colour and sets rapidly when mixed with water. USES – It is mostly used for the restoration of old buildings and monuments.
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PPT – Importance of the Waterproofing cement PowerPoint presentation ...
So, typically, once the concrete is set, it is followed by a curing process where the water content is evaporated. 6 Continue. However, the evaporation of water leaves void inside the concrete. Hence, good concrete mixtures use the minimal possible water in building concrete. The low water to cement proportion reduces the porosity of the concrete.
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What Is Special Concrete? - Types & Uses [Civil Planets]
Special Concrete – Types & Uses. 7 Mins Read. The concrete is a macro content that is made by blending cement, sand & coarse aggregate with water. The strength of the structure depends on the properties of the concrete we …
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PowerPoint Presentation
Most common type of Rigid pipe is Reinforced Concrete Pipe or RCP, shown in the center. Construction Inspection for FO Activities - Pipe Installation ... Inadequate amount or wrong type of cement used. Pipe connected after cement starts to dry . Joint not clean. ... PowerPoint Presentation Last modified by: Lang, Brian - NRCS, Salina, KS ...
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Various types of pressure pipes - SlideShare
R.C.C. PIPES R.c.c pipes can be manufactured by Pipes having bar and mesh reinforcement Pipes are made by lining thin cylinder steel shells both internally and externally with rich cement concrete. 10 11. HUME STEEL PIPES It consist of thin steel shell coated from inside with C.M Tk of the inside coating varies from 1.2 to 3.75cm depending upon ...
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Concrete Technology PowerPoint PPT Presentations - PowerShow
Concrete Pipe Making Machine is consolidated using Hydraulic Pressure as well as vibration. It is the best and most accurate method for the production of concrete pipes as per IS – 458. It is made using light weighed pieces of equipment and modern technologies. It can be a vertical or horizontal structure as per the choice of the entrepreneur.
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Concrete Pipe Facts | General | General - Concrete Pipe …
The water/cement ratio of concrete in pipes made using these processes is always less than 0.4 and more commonly in the range 0.3 to 0.35. This combination of such low water/cement ratios and high levels of compaction commonly achieves concrete compressive strengths up to 60 MPa and above. The concrete thus produced is practically impermeable ...
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Cement PowerPoint Templates w/ Cement-Themed Backgrounds
Best Cement PowerPoint Templates CrystalGraphics is the award-winning provider of the world's largest collection of templates for PowerPoint. Our beautiful, affordable PowerPoint templates are used and trusted ... Widescreen (16:9) Presentation Templates. Change size... Slide set featuring sandstone noise texture in grey color
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types of cement and their uses ppt - ST Engineering
Very fine aggregates are used in pumped concrete. the finer the aggregate used in the mix, the freer the concrete flows from the pipe. 16. limecrete. this concrete uses lime instead of cement, along with lightweight aggregates like glass fiber or sharp sand. its mainly used for the construction of floors, vaults and domes.
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Analysis of Steel Pipe Filled with Concrete - Eng-Tips Forums
I've used concrete filled pipe piles a few times on marine structures for the purpose of decreasing deflections. Your additional stiffness can be quantified by EI (effective), equation (I2-14) of AISC 13th (pg. 16.1-82) cessna98j (Civil/Environmental) 10 Feb 10 12:38. A further comment on the above: since there are no shear studs to get truly ...
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Hydration of cement - SlideShare
8. 1.4 Hydration of individual cement compound 1.4.1 : Hydration of C3S 2C3S + 6H = C3S2H3 + 3CH + Heat tri calcium water C-S-H C-H silicate (50-60% Solid in (20% solid in cement cement paste) paste) C-S-H (calcium …
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Curing of concrete - SlideShare
Why Curing of Concrete is Important Cement requires a water/cement ratio about 0.23 for hydration and a water/cement ratio of 0.15 for filling the voids in the gel pores. In other words, a water/cement ratio of about …
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Sulphate Resisting Cement - a detailed discussion - Structural Guide
Disadvantages of Sulphate Resisting Cement. Sulphate resistant cement shall be used with much care when sulphate resisting concrete are made for marine environments. When there is a risk of chloride attacks, it is not advisable to use this type of cement. Adequate curing of concrete shall be done. The cost of this type of concrete could be higher.
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Concrete - SlideShare
2. INTRODUCTION CONCRETE Concrete is a composite material in which a binding material mixed in water on solidification binds the inert particles of well graded fine and coarse aggregates. Cement and lime are generally used as binding materials, whereas sand cinder is used as fine aggregates and crushed stones, gravel, broken bricks, clinkers ...
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Vacuum concrete - SlideShare
ppt gursharan singh m.tech civil engineering ... The size of test specimens was 150x150 in cross section and 750 mm long. The effect of spacing of dewatering pipes and water/cement ratio on efficiency of the process and properties of concrete produced, molds of different sizes were used. ... Kurosaki T (1990) Effect of vacuum treatment on ...
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Can a New, Zero-Cement Solution Thwart Concrete Sewer Pipe …
Concrete sewer pipes frequently fail in as little as 10 to 20 years, leading to repairs that require ripping up the ground, diverting traffic and disrupting neighborhoods. Annual repair and replacement costs run about $25 billion in the United States and £15-£50 million in the United Kingdom. The culprit causing failure is the acidic ...
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ASBESTOS CEMENT PIPE GUIDANCE DOCUMENT
Cement Pipe. Owners/operators shall ensure the work practice standards listed below are followed: 1. Asbestos-cement pipe shall be handled in a manner that will minimize the risk of making it friable ACM or releasing asbestos dust into the environment. 2. At the start of work involving asbestos-cement pipe, owners/operators shall ensure that: a.
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Design Of Rcc PowerPoint PPT Presentations - PowerShow
This includes the cast iron pipes, asbestos pipe, PVC pipes, galvanized steel pipes, concrete pipes, HDPE pipes, to name a few. Concrete pipe which is often referred to as the reinforced cement concrete is one of the toughest material composition. There are many advantages of using these RCC pipes, they are strong, durable & are of good quality.
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ppt on pwd cement concrete road pavement - SlideShare
15. EFFECT OF DOWEL BARS ON CONCRETE PAVEMENT MATERIAL MIXING AND PLACING OF CONCRETE Fig.-1 Fig.-2 Mixer is equipment that mix the concrete using distinct amount of cement, concrete, sand and water. There are two type of mixer generally used during construction, Batch mixer- used for small road construction Continuous mixer- …
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Permeability of concrete - Concrete Construction
cement (w/c) ratio and the de-g r ee of cement hyd r ation or length of moist-curing. A low - p e r meability concrete re q u i r es a l ow w/c ratio and adequate m o i s t - c u r ing. Air entra i n m e n t aids watertightness but has little effect on perm e a b i l i t y. Pe rm e-ability increases with dry i n g . The permeability of mature
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Cement and cement concrete - SlideShare
concrete concrete is a composite material composed of gravels or crushed stones (coarse aggregate), sand (fine aggregate) and hydrated cement (binder),and imparts considerable hardness to the mixture. the cement …
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1. cement ppt - SlideShare
1. cement ppt 1. Cement: Cement is the mixture of calcareous, siliceous, argillaceous and other substances. Cement is used as a binding material in mortar, concrete, etc. 2. Chemical Composition of cement is: Lime 63% Silica 22% Alumina 06% Iron oxide 03% Gypsum 01 to 04% Suchismita Sahu, Asst. Professor KIIT University 3.
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Reinforced Cement Concrete PowerPoint PPT Presentations
View Reinforced Cement Concrete PPTs online, safely and virus-free! Many are downloadable. Learn new and interesting things. ... blocks, pipes, etc. It can be used where setting time is not a necessary criterion. ... PowerPoint Presentation Last modified by: zhouqi Created Date: 1/1/1601 12:00:00 AM Document presentation format: Other titles.
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Concrete, Cement and Cement-Lined Pipe - Little P.Eng.
Such pipe is made in sizes NPS 6 through 24 (DN 100 through 600) in accordance with ASTM Specification C505, Specifications for Non …
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Reinforced Cement Concrete: Types, Advantages & Disadvantages
Disadvantages of reinforced cement concrete: The tensile strength of this concrete is 1/10 of its compressive strength. The price of this concrete used for casting is comparatively excessive. The RCC column section is larger than the metal section for multi-story construction. Due to the shrinkage, the crack increases and the strength decreases.
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PRECAST CONCRETE PIPE
A 24" concrete pipe has a 30" outside diameter and a 36" precast opening. Tolerance = Precast Opening – R – y = 36" – (30"/Cos 17o) – 8" x Tan 17o ... Pipe.ppt Author: Christopher Whited Created Date: 2/25/2008 1:45:32 PM ...
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CEMENT CONCRETE - SlideShare
CEMENT CONCRETE 1. High compressive strength Lower tensile strength Negligible change when temp changes Develops cracks over time 2. Cement Water AggregatesReinforcement Admixtures 3. Used in mixing and …
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concrete_history.ppt | Concrete | Cement - Scribd
THE HISTORY OF CONCRETE. AND ITS RECENT DEVELOPMENT SIDDHARTH SHANKAR LECTURER IOE,PULCHOWK CAMPUS CHIEF,CMTL Concrete is composed mainly of cement (commonly Portland cement), aggregate, water, and chemical admixtures.. Portland Cement Coarse Aggregate. Chemical Admixtures Fine Aggregate Concrete has deep roots in history: …
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