The course on concrete technology focuses on concrete making materials including supplementary cementitious materials. Durability aspects of standard concrete m vijaya sekhar reddy1, i v ramana reddy2, k madan mohan reddy3 and c m ravi kumar4 in todays competitive environment it is becoming important to reduce the construction cost in one or other way. Civil concrete technology lectures notes concrete definition in its simplest form, concrete is a mixture of paste and aggregates rocks. Durability of reinforced concrete structures,theory vs. Ready mix concrete seminar report, ppt, pdf for civil. Pdf strength and durability of concrete paver block. Durability of concrete a durable concrete performs satisfactorily in the working environment during its anticipated exposure conditions during service. It is used to prepare cement mortar for building construction works like masonry, plaster, painting, flooring etc. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel.
Concrete technology notes pdf ct notes pdf eduhub sw. Durability of concrete may be defined as the ability of concrete to resist. When the structural element is not subject to durability concerns, specified compressive strength is the preferred performance criteria. Characteristic strength are based on the strength at 28 days. The compacting factor for concrete of medium workability is about 0. Do not specify maximum wcm or minimum cementitious. Types of cracking and influencing causes trb cracking webinar may 25, 2016 r. In last class, we have seen that it has got better durability.
Lecture 24 prestressed concrete prestressed concrete refers to concrete that has applied stresses induced into the member. The importance of water cement ratio in concrete countertop. Upon completion of new concrete structures, the achieved construction quality always shows a high scatter and variability, and in severe environments, any weaknesses in the concrete structures will soon be revealed whatever specifications and. But there are properties or characteristics of aggregate which influence the properties of resulting concrete mix. The ability of concrete to withstand the conditions for which it is designed without deterioration for a long period of years is known as durability. Manual for the design of reinforced concrete building. Durability of concrete structures article pdf available in arabian journal for science and engineering 362. Also explore the seminar topics paper on ready mix 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 2017 2018. So, you might be using simply high strength concrete or high performance concrete from the durability.
Chapter 6 provides updated knowledge on various cementbased composites, including selfconsolidation concrete, ultrahighstrength concrete, and extruded and engineered cementitious composites. Durability of concrete may be defined as the ability of concrete to resist weathering action, chemical attack, and abrasion while maintaining its desired engineering properties. Explore high performance concrete with free download of seminar report and ppt in pdf and doc format. Bickley and fung 2001 demonstrated that 40 mpa 6,000 psi highperformance concrete for bridges could be ecofig. Introduction concrete the man made rock is the most widely used construction material. Nptel provides elearning through online web and video courses various streams. Nptel syllabus concrete engineering and technology. Wong department of civil engineering, the university of hong kong, hong kong abstract. Without maturity monitoring, inplace concrete strength is estimated by performing compressive cylinder tests in a laboratory. Prestressed concrete structures nptel online videos.
Building materials,construction planning department of civil. More than 80,000 crores cum of concrete are poured every year. The wc ratio refers to the ratio of the weights of water and cement used in the concrete mix. The properties of hardened concrete are strength and durability. Now of course durable concrete will retain its original form quality and serviceability when exposed to the environment and that is very important for us as far as. To make the students to gain the knowledge on quality of concrete, durability aspects, causes of deterioration, assessment of distressed structures, repairing of structures and demolition procedures. Relying solely on lab tests requires several specimens and can waste valuable time if a projects inplace concrete reaches sufficient strength before standard test intervals. The course on concrete technology focuses on concrete making materials including. Hardened concrete will have no footprints on it if walked on. Aar, chemical attack, freezing and thawing, abrasion and fire. And how concrete microstructure and the reinforcement that is within the concrete can. Aggregates are used in concrete to provide economy in the cost of concrete. One concrete that performs satisfactory in a severe environment may deteriorate prematurely in another situation where it is consider as moderate.
And welcome to this course, this lecture on concrete engineering and technology. Hardening state after concrete has set it begins to gain strength and harden. Normal and special materials are used to make these specially designed concretes that must meet a combination of. Alkaliaggregate reaction portland cement association. In general, concrete mixes are designed in order to achieve a defined workability, strength and durability.
Going through the course one would develop firsthand knowledge on concrete production process and properties and uses of concrete as a modern material of. Highperformance concrete is often nomically made while. Aggregate strength, gradation, absorption, specific gravity, shape and texture are some of the physical and mechanical characteristics that contribute to the strength and durability of concrete. Quality control in concrete and durability factors. It is used to prepare cement concrete for various construction works. Vertical shaft kilns were replaced with rotary kilns and ball mills were used for grinding cement. Different concretes require different degrees of durability depending on the exposure environment and properties desired. Concrete ingredients have different thermal coefficients, so at higher temperatures, spalling and deterioration of concrete happens. Durability of concrete durability of concrete may be defined as the ability of concrete to resist. Different concrete mix designs with different materials, even. Advanced concrete technology kantipur engineering college. So let us see in this lecture what affects the durability, what can go wrong. Durability of concrete types of durability and factors.
Sengupta department of civil engineering iit madras. The deformation shows the characteristics of concrete with respect to tendency for segregation. Concrete mix design is the process of selecting suitable ingredients of concrete and determine the relative proportions to produce concrete with certain performance and durability requirements. Manu santhanam is a professor in the department of civil engineering at iit. High performance concrete seminar report, ppt, pdf for. Concrete production process also forms a part of the discussion. This greatly improves the longterm durability of structures, especially bridges and.
Polymer concrete is a composite material in which the aggregate is bound together in a matrix with a polymer binder. Quality of concrete can also be further assessed by giving a few tappings or blows by tamping rod to the base plate. In most concrete, aggregates are more or less chemically inert. Hardened concrete since concrete is a structural material we specify the grade of concrete in terms of it compressive strength, at certain age. Aggregate contribution mechanical properties of concrete. Concrete that is sloppy or wet may be easy to place but will be more difficult to finish. Nptel online videos, courses iit video lectures well organized. Performance based specifications for durable concrete. Typically, wires or tendons are stretched and then blocked at the ends creating compressive stresses throughout the members entire crosssection. Durability of reinforced concrete structures, theory vs practice albert k. However, some aggregates react with the alkali hydroxides in concrete, causing expansion and cracking over a period of many years. Durability since the entire section remains in compression, no cracking of the concrete can occur and hence there is little penetration of the cover. C2, w0 f0, s0, c0, w0 f3, s0, nrmca expanding the concrete.
Also explore the seminar topics paper on high performance 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. Explore ready mix concrete with free download of seminar report and ppt in pdf and doc format. 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 proportions, light weight aggregates, workability etc. The strength at 7 days is about twothirds of that at 28 days with ordinary portland cement and generally good indicator of strength likely to be obtained.
Additional information on workability and quality of concrete can be obtained by observing the manner in which concrete slumps. Strength and durability evaluation of recycled aggregate. Durability of concrete structures a long service life is considered synonymous with durability. It normally refers to the duration or life span of troublefree performance. Use of concrete in more challenging environments, better. Cip 44 durability requirements for concrete what are durability concerns concrete is a versatile construction material that can be used in a wide range of service and environmental conditions. The institution of structural engineers the institution of civil engineers march 2000 manual for the design of reinforced concrete building structures to ec2. Hydro power surface hardness mix design aggregates wc chemical resistant concrete. The durability of concrete as a construction material and the durability of reinforced concrete structures under different environmental conditions are probably. The exceptional durability of portland cement concrete is a major reason why it is the worlds most widely used construction material. The water to cement ratio largely determines the strength and durability of the concrete when it is cured properly. Concrete mix design definition concrete mix design is defined as the appropriate selection and proportioning of constituents to produce a concrete with predefined characteristics in the fresh and hardened states. Polymer concrete composites possess a unique combination of properties dependent on the formulation. This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications.
In addition to the traditional concrete technology topics dealing with the principles of concrete and concrete making materials, the current state of the art of self compacting concrete, special concretes, concreting techniques, nondestructive testing ndt, repairs and strengthening of. Durability of reinforced concrete structures,theory vs practice. Number ec171 september 20 transportation research board. Nowadays opc is widely used and it is the costly ingredient in the production of concrete. But material limitations, design and construction practices, and severe exposure conditions can cause concrete to deteriorate, which. Pdf concrete paving blocks are ideal materials on the footpaths for easy laying, better look and finish. Wong department of civil engineering, the university of hong kong introduction reinforced concrete deterioration.
Durability is defined as the capability of concrete to resist weathering action, chemical attack and abrasion while maintaining its desired engineering properties. Extensive experience demonstrates that the durability of concrete structures is related not only to design and material but also to construction issues. The paste, composed essentially of portland cement and water, coats the surface of the fine small and coarse larger aggregates. Through a series of chemical reactions called hydration, the paste hardens and gains strength to form the rocklike mass known. It is also clear that many issues not related to materials selection or proportioning can have major effects on durability of concrete. The composites do not contain a hydrated cement phase, although portland cement can be used as an aggregate or filler. Pdf durability of concrete structures researchgate. Nptel syllabus concrete engineering and technology video course course outline the course deals with different aspects of modern concrete technology that has evolved as a result of rapid developments in mechanized construction, use of mineral and chemical admixtures in concrete. Since durability under one set of conditions does not necessarily mean durability under another, it is customary to include a general reference to the environment when defining durability. Jan 15, 2011 extensive experience demonstrates that the durability of concrete structures is related not only to design and material but also to construction issues. Strength and durability evaluation of recycled aggregate concrete. Conditions that can impact the service life of concrete structures should be identified during design and addressed in project specifications.