Concrete is a synthetic, manmade rock composed of water, cement and aggregate. Gudadappanavar assistant professor department of civil engineering presented by. The disadvantage of the higher replacement level is that early age strength development is somewhat slower. Benefits of using ggbs cement in large concrete pours. The use of permeable concrete for ground water recharge pdf. Data showed that the presence of rubber in concrete increases toughness. In the production of ready mixed concrete, ggbs replaces a substantial portion of the normal portland cement concrete, generally about 50 %, but sometimes up to 70%.
This is the prestressed concrete a fundamental approach 5th edition solution manual by edward g. Prestressed concrete a fundamental approach 5th edition. Apr 22, 2020 an exposedaggregate surface is obtained by placing concrete and then removing the outer skin of cement paste to uncover decorative coarse aggregate either batched into the concrete mix or seeded onto the surface. Thus far the use of recycled rubber as aggregate in concrete has not given results that could indicate the possibility of its use as structural material. The aggregate consists of a mixture of various sizes of gravel and sand. Experimental study on self compacting concrete ssc using ggbs and fly ash biswadeep bharali assistant professor, civil engineering department, assam down town university. Aggregate aggregates are the important constituents in concrete. N engineering college, gulbarga, karnataka, india abstract this paper presents a laboratory investigation on. Among these ingredients, aggregate plays a very cru ial ole n nc ete wh h o upy the largest volume of about 6075% of total concrete volume. Kno100516 introduction to concrete building products. The results shows that the iron slag added to the concrete had greater strength than the plain concrete. Strength properties of hpc using binary, ternary and quaternary cementitious blends.
For the concrete novices out there, aggregate is the crushed rock which forms the large portion of concrete, while cement is powdered rock made of limestone and clay which is used to form the glue that binds the aggregate together. However special precautions need to be taken if it needed to carry intermittent heavy loads such as truck or. It has the properties that it will creep deformation with long term load and shrink a result of hydration that must be considered. Ultra high performance concrete uhpc with a high compressive strength of more than. They give body to the concrete, reduce shrinkage and effect. The code user will find that aci 31814 has been substantially reorganized and reformatted from previous editions. In an effort to maximize small business participation, the city of san antonio s cosa. Concrete is the most widely used material in the construction industry. Reinforced concrete is a composite material, and the average density is considered to be 150 lbft3. The concrete is allowed to do most or all of the work of resisting compressive stresses.
Hot weather may be defined as any period of high temperature in which special precautions need to be taken to ensure proper handling, placing, finishing and curing of concrete. The emphasis throughout is on understanding the behaviour of concrete and relating it to physical and chemical phenomena involved in the performance of the material in service. In recent years, the accelerating urbanization has led to. The use of glass as a fine aggregate in portland cement concrete has been studied and some countries currently use this material. Experimental study on partial replacement of cement by flyash and ggbs syed asif ali1 professor shaik abdullah2 1p. Steel reinforcing rods are placed in those regions of reinforced concrete components where tensile forces will be experienced, to resist these forces and control cracking of the concrete. A study of effects of aggregate on concrete rheology jiong hu iowa state university follow this and additional works at.
Concrete is a composite material, basically consisting of different constituents such as binding materials, water, aggregates and admixtures. As hong kong is not a major producer of steel, ggbs as a byproduct of steel has to be imported overseas and this introduces higher material cost due to transportation and the supply of ggbs is unstable and unsteady. How to use glass as aggregate in concrete concrete decor. Increasing the compressive strength of portland cement. Free bim objects for aggregate concrete blocks masonry units to download in many design software formats, manufacturer objects contain real world data. Concrete is a highly durable material that if well made can last 100 years or longer. Concrete is a mixture of cement blended with water and various sizes of aggregates. Use of recycled tires as partial replacement of coarse. Hooks in reinforcing which are not otherwise detailed shall be. Aalborg white is characterised by a compressive strength of min.
Concrete mix design 458 concrete technology 11 c h a p t. Jun 24, 2010 benefits of using ggbs cement in large concrete pours 1. The concern about the depletion of natural sources and the effect on environment has particularly focused attention on synthetically produced material aggregate manufactured from waste material as an alternative to naturally occurring materials. This is the second article in a yearlong series that explores the science of concrete to provide a better understanding of mix design. An important feature of the project was the need to balance the research requirements of the. This fourth edition of the national structural concrete speci. The results confirm that the use of iron slag overcome the pollution problems in the environment. An aci standard and report american concrete institute. A study of effects of aggregate on concrete rheology. Use of iron slag as partial replacement of sand to concrete. G student structural engineering 2professor 1,2department of civil engineering 1,2k. Hot weather problems are most frequently encountered in the summer, but the associ. For onesemester, seniorgraduatelevel courses in prestressed concrete departments of civil engineering. Many tests were conducted to cement some of them are consistency tests, setting tests, soundness tests, etc.
Concrete is a composite material composed of fine and coarse aggregate bonded together with. Pdf study on strength properties of concrete by partially. Jul 08, 2005 photographs courtesy of american specialty glass, inc. Part of thecivil engineering commons this dissertation is brought to you for free and open access by the iowa state university capstones, theses and dissertations at iowa state university.
This material is obtained by the heating of iron ore, limestone and coke at a temperature about 1500 degree celsius. The overall effect is to give an integrated view of the properties of concrete so as to enable the reader to achieve the best possible construction in concrete. If you want concrete that truly sparkles and shines, put some glass in the mix. Experimental study on partial replacement of cement by flyash. Ground granulated blast furnace slag in concrete and its. Abhijeet kumar singh 2sd11cv001 aquib nasir razi 2sd11cv009 dibyajyoti sarma 2sd11cv020 kamlesh kumar 2sd11cv031 8th semester b. What is the advantage of using ggbs as replacement of. Concrete is a mixture of cement, fine aggregate, coarse aggregate and water. Research paper investigation of nofines concrete in building. Tci constructionrelated national institute of government purchasing nigp codes all notifications from the san antonio electronic procurement system saeps are based on nigp codes. The ground granulated blast furnace slag ggbfs is a byproduct of iron manufacturing which when added to concrete improves its properties such as workability, strength and durability.
The insitu concrete test building at cardington provided an ideal opportunity to establish a benchmark for alternative systems of concrete strength assessment to cube testing for early age strength monitoring. Effects of ggbs on geotechnical properties of black cotton soil under the guidance of shri. Aggregate concrete blocks nbs national bim library. Another major hurdle of extensive use of ggbs concrete lies in the little source of supply of ggbs. If design mix concrete cannot be used for any reason on the work for grades of m20 or lower, nominal mixes may be used. Shrinkage change in volume of concrete due to loss of moisture at different stages. Possessing high strength and stability, concrete is also an economical building material. Building code requirements for concrete thin shells aci 318. Except as otherwise shown, reinforcing shall be detailed in accordance with the latest ecfltion of the aci detoifing manual and instolled in accordance with the lotest edition of the crsi placing manual. Concrete masonry unit or concrete block or cmu is the most affordable and banal looking thing in the built environment, but also the most versatile building material. May 11, 20 elasticity concrete not an elastic material stress in concrete a strains in initial stages influenced by elastic properties of aggregate, mix proportion, age of concrete, type of cement. Concrete is a mixture of cement, water and aggregate.
The higher the portion, the better is the durability. Mongkol jiravacharadet school of civil engineering suranaree university of technology lecture 1 introduction. Fundamentals of concrete materials testing and inspection. C94c94m, standard specification for readymixed concrete. Glass aggregate can replace part or all of the sand and gravel in concrete, for effects that range from colorful terrazzo, to granite or marblelike finishes, to concrete that reflects light like a mirror. Out of the total production, ordinary portland cement accounts for about 8090%. Because of its durability and skid resistance, an exposed aggregate finish is ideal for most flatwork including. Exposed aggregate concrete decorative pebble finish the.
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