Fly ash fa, compared to ground granulated blastfurnace slag ggbfs, is positive to the compressive strength increasing at low temperature. Our high range water reducers offer high early strengths and the enhanced workability and pumpability needed in todays competitive concrete construction market. Mineral admixture is a key material component in high performance concrete. Effect of mineral admixtures on durability properties of. Incorporating mineral admixtures i n high performance green concrete article pdf available in international journal of applied engineering research 1047. The earliest is the traditional normal strength concrete which is composed of only four constituent materials, which are cement, water, fine and coarse aggregates. Grouting admixtures a variety of admixtures for concretebased grouts which prevent bleeding and segregation, increase cohesion and retention of water during pumping, and increase set times. Workability characteristics of the fresh concrete are analyzed and hardened concrete properties tested in this research are compressive strength, chloride ion permeability, and creep and drying shrinkage properties. The effect of mineral admixtures on the properties of high performance concrete. Studies on influence of mineral admixtures on high.
Performance of cement concrete with mineral admixtures. Cement replacement materials are byproducts used to produce high performance concrete. To produce such a high performance concrete, mineral admixtures like silica fume, metakolin and fly ash on the one hand and super plasticizer on the other hand. Experimental procedure admixtures for ultra high performance concrete namely silica fume was used in both mixes, mix1 and mix2 uhpc mix 1 with three different steel fibers of. Admixtures are used to overcome difficult construction situations, such as hot or cold weather placements, pumping requirements, early strength requirements, or very low watercement ratio specifications. The user who can use byproduct mineral admixture in large amount such. Pdf green concrete capable for sustainable development is characterized by application of industrial wastes to reduce consumption of. Selfcompacting high performance concrete schpc is defined as a new generation of concretes on the basis of the concepts of selfcompacting concrete scc and. Starting in 1979 with the technical service group, dr. Explore concrete admixtures with free download of seminar report and ppt in pdf and doc format. Highrange water reducers, astm c 494 aashto m 194 types f water reducing and g water reducing and retarding, can be used to impart properties induced by regular water reducers, only much more efficiently. The methodology adopted is that mineral admixtures ggbfs and silica fume are replaced by 10%, 20%, 30% and 5%, 10% and 15% respectively for fly ash and performance is measured.
Use of chemical and mineral admixtures in concrete ppt free download as powerpoint presentation. Cement and concrete mineral admixtures request pdf. Such materials are characterized by improved mechanical and durability properties resulting from the use of chemical and mineral admixtures as well as specialized production processes. Selfcompacting concrete is a concrete that can flow and consolidate under its own weight, pass through the spaces between the reinforcement bars to completely fill the formwork, and simultaneously maintain its stable composition.
Use of chemical and mineral admixtures in concrete ppt. Generally in concrete, portland cement is replaced by. One of the disadvantages of selfcompacting concrete is its cost, associated with the use of high volumes of portland cement and use of chemical admixtures. Index termshigh performance concrete, mineral admixtures, superplasticizers, foundry sand etc. They are also used for concrete requiring highearly stripping strengths. An experimental study on high performance concrete using. The long term strength of concrete obtained using these mineral.
But brittle failure is a result of negative impact of inclusion of mineral admixtures in high performance concrete hassan et al. Keywords deterioration, high performance concrete, mineral admixtures i. High range water reducing admixture reduces the quantity of mixing water required to produce concrete of a given consistency by 12 % or greater, as per astm c 494 c 494m. With the low water cement ratio, mineral admixture is of advantages. Effect of mineral admixtures on the properties of high. Such admixtures also provide high resistance to cycles of wetting and drying. This paper is an attempt to study the behavior of silica fume and metakeolin 8%. Some admixtures act as water reducers and when added to concrete can create a desired slump at a lower watercement ratio than what it is normally designed. Effects of different mineral admixtures on the properties.
Concrete construction engineering handbook, second edition. Performance of ultrahigh performance concrete containing. Krete mix 150 a concentrated, swipe producing concrete admixture designed to improve the workability of semi dry concrete mixes. Concrete admixtures are generally divided into 2 types i. Innovations in chemical admixture technology as related to. There is a close relationship between the gas permeability of modern high strength concrete and the concrete durability. Replacement levels of fa and ggbfs were 15%, 30%, 45% and 60%. High range water reducing admixture astm c494 types f and g decreases the watercement ratio and provides highperformance, particularly at early ages. The effect of mineral admixtures on the properties of high. Study on effect of mineral admixtures in high performance concrete.
Comparison of normal and highstrength concrete in which cement has been partially. The resultant foamed concrete presents its thermal conductivity of about 0. Incorporation of mineral admixtures in sustainable high. This increase is compensated by a decrease in the fine aggregate content. They can greatly reduce water demand and cement contents and make low watercement ratio, highstrength concrete. The effect of mineral admixtures on mechanical properties. Use of mineral admixtures reduces the cost, permeability, and. Concrete admixtures seminar report, ppt, pdf for civil. Through the cembureau method, gas permeability coefficients of ordinary concrete and concrete with admixtures under different maintenance periods were tested. Robustness enhancing admixture line for pumped concrete with no. Increase later strength of concrete, reduce the hydration heat, enhance the compactness of.
Development of high performance concrete and evaluation of. The results show that the compressive strengths of concrete are increasing with lower temperatures. Introduction highperformance concrete is defined as concrete that meets special performance and uniformity requirements that cannot always be achieved routinely by using conventional materials and normal mixing, placing, and curing practices. The titled high performance foamed concrete was developed from portland cement, ultra fine granulated blastfurnace slag, pulverized fly ash and condensed silica fume by means of prefoaming process. The testing study focused on realcrete, produced in a readymix batch plant as opposed to a controlled laboratory study.
Application of mineral admixture in high performance concrete. Krete superplast 700 a high performance concrete admixture to. Because of their superior engineering and performance properties, mineral admixtures are normally contained in the production of high strength and high performance concrete gesoglu et al. Many works were performed and are still in progress regarding the usage of these mineral admixtures in high strength concrete hsc and high performance concrete hpc. Major functions and advantages of using admixtures are detailed below. One alternative to reduce the cost of selfcompacting concrete is the use of mineral admixtures such as silica fume, ground granulated blast furnace slag and fly ash, which is finely.
In high performance concrete, this is the method of choice, since it increases the cementitious content. Standard specification for chemical admixtures for concrete. Pdf incorporating mineral admixtures in high performance. Mechanical characteristics of hardened concrete with. High range waterreducing admixtures can also be used for precastprestressed structures where it is desirable to keep the watercement ratio to a minimum for low permeability and high early strengths without set retardation. Currently, highperformance concrete is used in massive volumes due to its technical and economic advantages. Published data on the effects of combinations of mineral admixtures in concrete on the microstructural and performancerelated properties under different curing regimes are comparatively little. We studied the influence of fly ash and slag on high performance concrete gas permeability, and analysed the rules. Sometimes admixtures are used to improve concretes resistance to severe frost action or freezethaw cycles. As explained above, admixtures are added to modify concrete properties. Pdf the effect of mineral admixtures on the properties of high. An experimental study on high performance concrete using mineral. This website was originally developed by charles camp for his civl 1101 class.
Pdf incorporation of mineral admixtures in sustainable. When highrange admixtures are used to impart increased workability 6 to 8in. An extensive study of the improvement in concrete performance associated with the addition of high reactivity metakaolin hrm, a mineral admixture, was performed. Addition method usually results in higher strengths. The development of high performance concrete hpc has brought about the essential need for additional ingredients. Preparation of high performance foamed concrete from. Increase later strength of concrete, reduce the hydration heat, enhance the. Admixtures are generally used to alter the properties of concrete such as increased workability or reduced water content, acceleration or retardation of setting time. High performance concrete admixtures euclids special class of high range water reducers lower watercement ratios, increasing slump to produce flowable concrete. Also explore the seminar topics paper on concrete admixtures 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. In comparison to concrete with opc only, early and extended curing are required to obtain higher long term strength and better durability performance. The effect of very low temperature on high performance concrete hpc mechanical properties is studied by using a reasonable testing method.
The mix design for selfcompacting high performance. Chemical admixtures for concrete the following materials are prequalified in accordance with dms4640, chemical admixtures for concrete. Use chemical admixtures to improve concrete performance. Since waterproofing concrete is a broad topic, this report only highlights the admixtures to be included in concrete for watertight construction. Further the correlation of strength of concrete to its permeability and pore structure is also not clear. Request pdf high performance concrete with mineral admixtures the development of high performance concrete hpc has brought about. Pdf the effect of mineral admixtures on the properties.
The paper presents a laboratory study on the influence of two mineral admixtures, silica fume sf and fly ash fa, on the properties of superplasticised highperformance concrete. Highrange water reducers, commonly called superplasticizers, were developed for highstrength and high performance concrete applications. The available literature identifies that the addition of mineral admixture as partial replacement of cement improves the microstructure of the concrete i. Report on concrete admixtures for waterproofing construction. Microstructure analysis and strength properties of. Admixtures a material other than water, aggregates, or cement that is used as an ingredient of concrete or mortar to. A material other than water, aggregates, or cement that is used as an ingredient of concrete or mortar to control setting and early hardening, workability, or to provide additional cementing properties. The dosage rates indicated are the manufacturers published recommended dosage rates for use under normal conditions. Admixtures may enhance the durability, workability or strength characteristics of a given concrete mixture.
Comparison of normal and highstrength concrete in which cement has been partially supplemented by. Mixtures having a high range water reduction generally display a higher rate of slump loss. High performance concrete is a concrete in which certain characteristics are developed for a particular application and environment, so that it will give excellent performance in the structure in which it will be placed. Jeknavorian is a research fellow with the construction products division of w. Innovations in chemical admixture technology as related to sustainability aci spring 2012 convention march 18 21, dallas, tx aci web sessions ara a. Concrete is the most widely used construction material in india with annual consumption exceeding 100 million cubic meters. Assessment of the concrete mixes was based on short and longterm testing techniques used for the purpose of designing and controlling the quality of high.
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