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Air Pollution PPT and PDF for Free Download

Air Pollution PPT and PDF for Free Download: Air plays a vital role not only in nature but also in the lives of human beings and all living organisms; around 18,000 distinct species need air.Living organisms can survive without water for some time but cannot survive without air because when we breathe then we intake oxygen from the air and releases carbon dioxide, if this procedure does not ...

Eurocode 2: Design of concrete structures EN

Concrete strength at a time t (3.1.2) Expressions are given for the estimation of strengths at times other than 28 days for various types of cement f cm(t) = β cc(t) f cm where f cm(t) is the mean compressive strength at an age of t days β cc(t) = exp {s[1-(28/t)1/2]} The coeeficient s depends on type of cement: s = 0,20 for rapid hardening

PPT – Nouns PowerPoint presentation | free to download ...

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Concrete Mix Design -

Step 03: Water/cement ratio Find the water/cement ratio from the strength point of view from Table 11.5. Find also the water/ cement ratio from durability point of view from Table 11.6. Adopt lower value out of strength consideration and durability consideration. Since OPC …


cement amounts can be reduced because concrete strength is directly related to the water/cement ratio. Definition of Mineral Admixtures Mineral admixtures include fly ash, hydrated lime, silica fume and ground blast furnace slag. Many of these materials have cement-like properties, augmenting the strength and density of the finished concrete.


Standard Specification for Precast Concrete Manhole Sections • Part II covers the minimum requirements for the various manhole components. • The following products are addressed: grade rings, flat slab tops, risers/conical tops, base sections and steps/ladders. • It should be noted that ASTM Standards are minimum design specifications.

Cement - SlideShare

1. cement ppt. Next. Download Now. Download to read offline and view in fullscreen. ... Grades of Cement Before 1987 only one grade of cement. ... CATEGORY ULTRATECH CEMENT ACC CEMENT SHREERAM CEMENT LAFARGE CEMENT B CATEGOREY J.K SUPER CEMENT J.P CEMENT BIRLA UTTAM FREE CEMENT C CATEGORY BIRLA CHETAK ROCK STRONG CEMENT …

principles of concrete mix design.ppt - ACC Help

Exposure Plain Concrete Reinforced Concrete Min. Cement Max w/c Min grade Min. Cement Max w/c Min grade Mild 220 kg/m3 0.60 -- 300 kg/m3 0.55 M 20 Moderate 240 0.60 M 15 300 0.50 M 25 kg/m3 kg/m3 Severe 250 kg/m3 0.50 M 20 320 kg/m3 0.45 M 30 V. Severe 260 kg/m3 0.45 M 20 340 kg/m3 0.45 M 35 Extreme 280 kg/m3 0.40 M 25 360 kg/m3 0.40 M 40


Necessity of high grade of concrete & steel: Higher the grade of concrete higher the bond strength which is vital in pretensioned concrete, Also higher bearing strength which is vital in post-tensioned concrete. Further creep & shrinkage losses are minimum with high-grade concrete. Generally minimum M30 grade concrete is used for post-tensioned ...

POLLUTION PPT and PDF Free Download

POLLUTION PPT and PDF Free Download: Environmental pollution can be defined as a change that is not wished or desired in the chemical, physical, or biological characteristics of any component of the environment (air, water, and soil) which can cause harmful effects on various or many forms of life.Pollution is of different kinds depending on the nature of pollutants and pollutions.

Concrete Technology (CT) Notes pdf - Free Download 2020 | SW

Here you can download the free lecture Notes of Concrete Technology Pdf Notes (CT Pdf Notes) with multiple file links to download. The Concrete Technology Notes Pdf (CT Notes Pdf) book starts with the topics covering Portland cement, Mineral and chemical admixtures, Classification of aggregate, Factors affecting workability, Water / Cement ratio, Compression tests, Factors in the choice of mix ...


Lightweight concrete can be defined as a type of concrete which includes an expanding agent in that it increases the volume of the mixture while giving additional qualities such as nailbility and lessened the dead weight. Lightweight concrete maintains its large voids and not forming laitance layers or cement films when placed on the wall.

Cement Composition Types and Manufacture - AboutCivil.Org

Summary of Cement Compounds Gypsum CaSO4. 2H2O CSH2 ~2-6 Tetracalcium 4 CaO. Al2O3.Fe2O3 C4AF ~5-8 aluminoferrite Tricalcium aluminate 3 CaO. Al2O3 C3A ~5-10 Dicalcium silicate (Belite) 2 CaO. SiO2 C2S ~15-20 Tricalcium silicate (Alite) 3 CaO.


Characteristics compressive strenght of concrete in 28day (maximum) WATER-RATIO/50KG 7days 28 days CUBE TEST(N/mm^2) CYLINDER TEST(N/mm^2) RATIO (C:FA:CA) CEMENT strength strength M5 C4 (1 : 5 : 10) 60 Lit 5 M7.5 C6 (1 : 4 : 8) 45 Lit 7.5 Nominal mix normal M10 C8 (1 : 3 : 6) 34 Lit 7 10 M15 C12 (1 : 2 :4 ) 32 Lit 10 15 M20 C16 (1 : 1.5 : 3) 30 Lit 13.5 20 M25 C20 (1 : 1 : 2) 17 25 M30 …

IS 456: Plain and Reinforced Concrete - Code of Practice ...

In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them.

5,000+ Limestone PPTs View free & download |

Uses of Limestone: cement, crushed stone - Uses of Limestone: cement, crushed stone ... Marble Matters offers first grade natural stone products from different parts of the world. We work closely with our suppliers in the manufacturing of our tiles. ... PowerPoint PPT presentation | free to download .

GGBS | PDF | Concrete | Cement

Cement Kiln dust and fly ash being kind of industrial waste were identified for use in different percentages as cement replacement for making Self-Compacting Concrete. He targeted concrete of grades M20, M25, and M30, and used Portland type 2 cement, a cement industry waste Cement kiln dust (CKD), blackish color fly ash acquired from Thermal ...

IS 10262 (2009): Guidelines for concrete mix design ...

mineral admixtures shall also be considered in water-cement ratio calculations in accordance with Table 5 of IS 456. 4.1.1 The free water-cementratio selected according to 4.1 should be checked against the limiting water­ cement ratio for the requirements of durability and the lower of the two values adopted. 4.2 Selection ofWaterContent

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Best Practices Guidelines for Concrete Construction

6 Best Practices Guidelines for Concrete Construction Once the concrete supplier is aware that a specific general contractor or construction manager has ex-pressed interest in obtaining quotations for concrete supply, they should contact the estimator or manag-er in …

(PDF) Cement Manufacturing - ResearchGate

cement is made by heating limestone (calcium carbonate) with other materials (such as cla y) to. 1450 °C in a kiln, in a process known as calcinations, whereby a molecule of carbon dioxide is ...

List of Building Materials Required for Construction

Cement is a material that sets, hardens and can bind together all other building materials. The different grades of cement are 53-grade cement, 43-grade cement, PPC cement, PSC cement, etc. All these different grades of cement are manufactured by a number of brands in India.

Aggregates for Concrete - Memphis

does not necessarily assure defect-free concrete. For adequate consolidation of concrete, the desirable amount of air, water, cement, and fine aggregate (that is, the mortar fraction) should be about 50% to 65% by absolute volume (45% to 60% by mass). Rounded aggre-gate, such as gravel, requires slightly lower values, while

Concrete Mix Design Calculations

1/22/2014 6 Basic Concrete Mix Design Materials Pounds of material S.G. Abs Volume 667 3.15 X 62.4 Cement 667 3.15 3.39-Total Cementious 667 Miller Stone 1590 2.6 9.80


The grade designation giving the characteristic strength requirement of concrete. The type of cement influences the rate of development of compressive strength of concrete. Maximum nominal size of aggregates to be used in concrete may be as large as possible within the limits prescribed by IS …

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Chapter 2 Asphalt and Asphalt Paving Materials

Asphalt Concrete is known by many differ-ent names: hot mix asphalt, plant mix, bituminous mix, bituminous concrete, and many others. It is a combination of two primary ingredients - aggregates and asphalt cement. The aggr egates total 90 to 95 per cent of the total mixture by weight. They are mixed with 5 to 10 percent asphalt cement to form


Uses of cement It is used in making joints for drains,pipes. It is used to prepare RCC structures of building by using reinforcement with cement concrete. it is used in construction of buildings, bridges, tanks, domes, flyovers, dockyard etc. It is used to prepare cement mortar for building

Cement manufacturing process - SlideShare

Concrete • The world's most widely used building material. • Global production is 5 billion cubic yards per year (using approximately 1.25 billion tons of cement). 7. Concrete owes its strength and durability to one essential ingredient - Portland Cement. 8. Portland Cement • Limestone + Shale/Clay + Heat = Clinker + CKD + Exit Gas.

PPT – self compacting concrete PowerPoint presentation ...

EFFECT OF W/C RATIO ON SELF COMPACTING CONCRETE OF M70 GRADE WITH FLY ASH AND MICRO SILICA AS FILLER MATERIAL. – A free PowerPoint PPT presentation (displayed as a Flash slide show) on - id: 41bec0-MDMwZ


Download Free PPTX. Download Free PDF. PRESENTATION ON ANALYSIS AND DESIGN OF T-BEAM BRIDGE SUPER STRUCTURE USING LIMIT STATE METHOD ... Grade of Concrete Span Length Spacing of girders Number of Traffic lanes Grade of steel • Relation between cost of construction and reliability was also studied which indicates that the over all cost is ...

Ppt on cement grade project - SlideShare

• The grade 43 and 53 in cement mainly corresponds to the average Compressive strength attained after 28 days (6724 hours) in mega Pascal (Mpa) of at least three mortar cubes ( area of face 50 cm squared ) composed of one part cement, 3 parts of standards and (conforming to IS 650:1966) by Mass and P/4 ( P is the percentage of water required ...

PPT – What are different grades of cement? - PPT ...

Due to the availability of higher grades in the cement, the use of 33-grade cement has declined. 43 Grade Cement 43-grade cement means that the compressive strength of the cement after 28 days is 43N/mm2 when tested as per Indian Standards under standard conditions. | PowerPoint PPT presentation | free to view