Pdf investigation on pozzolanic effect of fly ash in. The effect of replacing 35 to 50 percent of cement by fly ash, on the compressive strength of lean concrete mixtures 350 lbsyd 3. Major highway concrete pavements in iowa have exhibited premature deterioration attributed to effects of ettringite formation, alkalisilica expansive reactions, and to frost attack, or some combination of them. Nevertheless, these performance limitations can be mitigated by incorporation of nanoparticles for example, nanosilica in fly ash concrete. Care should be taken when using fly ash in concrete due to. Recyclable concrete pavement was made from fly ash and crushed limestone sand and gravel as aggregates so that the concrete pavement. Administration encouraged the use of fly ash in concrete pavement with its notice n 5080.
Irc60 lime fly ash concrete for pavement construction. Pdf class f fly ash assessment for use in concrete pavements. Anzalone research engineer michigan tech jianping dong, ph. The interlocking concrete pavement institute icpi, founded in 1993, is the north american trade association representing the segmental concrete paving industry.
Airport concrete pavement project funded under the federal airport improvement program aip are typically developed in accordance with the requirements contained in item p501 and sometimes in conjunction with. Highvolume fly ash concrete university of wisconsin. Many practicing engineers are unaware of the basic design issues which should really be understood before undertaking the construction of any pavement in concrete. P pavement surface evaluation and ratingaser manual. A guide to airfield pavement design and evaluation dmg27. Fly ash booklet for pdf federal highway administration. Tech structural engineering 3associate professor 1,2,3department of civil engineering 1,2,3madan mohan malviya university of technology, gorakhpur, uttar pradesh, india abstract in these days the use of concrete paver block in. A guide to airfield pavement design and evaluation 1. Fly ash facts for highway engineers fhwa us department of. Concrete pavement, was initiated to assist txdot in using more durable repair practices and materials for concrete spalls, especially in crcp pavements. Practices vary from state to state, but dowel bars are typically required in eightinch or thicker pavements. Are case studies or field data available, especially where more than 30% fly ash was used in the mix. In this study, an effort was made to develop nanomodified fly ash concrete as a repair material for concrete pavements. Greatly increased use of fly ash in hydraulic cement.
Failures of fly ash settling ponds, like the 2008 tva spill, are extremely rare events, and in any case, only dry fly ash is used in concrete not wet material in settling ponds. Crouch1, ryan hewitt1, ben byard1 1 tennessee technological university, box 5015, cookeville, tn 38505 keywords. The formulations of the nanomodified fly ash concrete stem from a compatibility perspective between repair and parent concrete. Lecturer, 3lecturer, ssbts college of engineering and technology, bambhori, jalgaon, ms. Detailed procedures are given for the design of concrete pavement for runways, taxiways, and aprons, including simplified design. Pavement construction with highvolume class c and class f. Portland cement alone or in combination with one or more of blended hydraulic cement, expansive hydraulic cement, fly ash, and other pozzolans, ground. The wisconsin department of transportation wisdot currently specifies class c fly ash for use as a partial replacement for portland cement in concrete pavements. In present study aims preparing concrete by replacement of ordinary portland cement opc with fly ash in various proportion like 10%, 20%, 30%, 40% and 50% fly ash by mass. Pervious concrete is a special concrete with porosity, in which the voids are intentionally created. Recyclability of concrete pavement incorporating high volume of. Concrete mixes were proportioned to replace 20 and 50 per.
A longitudinal construction joint ties the concrete ear to the adjacent pavement with tie bars. Effects of fly ash content on the strength property of. The fhwa indicated that the replacement of cement with fly ash of the order of 10% to 25% can be made giving equal or better concrete strength and durability. In 1963, the department of highways initiated an experimental project wherein fly ash was hughes, r. They observed that incorporation of 6% ns not only improved the. The work reported in this paper is based on a laboratory study of superplasticized highvolume flyash hvfa concrete suitable for pavement. This increases strength and reduces permeability 1 objective of this study to tests and analysis on fly ash concrete prepared by fly ash optimum replacement with cement. Q what are the effects of using fly ash in concrete pavements. However, in a fast track mix, fly ash is considered more of an additive. The study discloses that high volume of fly ash in concrete reduces the water demand and improves the workability. Guidance documents used for fly ash quality assurance. A qualitative approach manish kumar mandal department of civil engineering 2nd year vel tech high tech engineering college by 2. Compressive strength of low cementhigh fly ash concrete. Dowel bar baskets the location of the center of the dowel bar assembly is marked outside of the formslab line so that the.
Studies of the properties of paver block using fly ash ritesh mall1 sharda shrama2 prof. Pdf the performance of pavement is very responsive to the characteristics of the soil subgrade. Home programs pavements sustainability recycling fly ash facts for highway engineers chapter 2 highway applications fly ash facts for highway engineers. Fly ash improves workability for pavement concrete typical strength gain of fly ash concrete permeability of fly ash concrete fly ash concrete is used in severe exposure applications such as the decks and piers of tampa bays sunshine skyway bridge fly ash concrete finishing full. Because intrusion of air voids is not there, freeze thaw effect is less. Using fly ash to substitute the filler in bituminous mixtures is not only a way of disposing of this waste in a safe manner but it is a way of reducing the energy requirements for the preparation and placement of this composite in road pavements. Drylean concrete dlc a lowstrength portland cement concrete generally.
Stabilization of pavement subgrade by using fly ash. Sponsored by the wisconsin highway research program. As a result, concrete pavements do not necessarily require strong support from below. Optimizing the strength of rigid pavement by replacing. Stabilization of pavement subgrade by using fly ash activated by cement magdi m.
Evaluation of properties of highvolume flyash concrete for. Structural applications of concrete containing fly ash have been limited mainly to high strength concrete in the past. Durability of fly ash concrete sufficiently cured fly ash concrete has a dense structure and hence more resistance to deleterious. Carrasquillo research report number 4816 durability and performance of concrete containing fly ash research project 359481 conducted for texas state department of highways and public transportation in cooperation with the. A guide to airfield pavement design and evaluation defence estates ministry of defence. Optimizing the use of fly ash in concrete portland cement. Using fly ash in concrete is environmentally beneficial because it reduces the portland cement a major contributor of co2 required in concrete. How ever, it is important that the support be reasonably uniform with no abrupt changes in degree of support.
Download concrete pavement design guidance notes by geoffrey griffiths and nick thom concrete pavements are a frequently misunderstood form of construction. Because of the rigidity of concrete pavements, loads are spread over large areas of the subgrade and pressures on the subgrade are very low. Through the cement concrete slab can also be laid directly over the soil subgrade, this is not preferred specially when the subgrade have fine grained soil. The future of fly ash use in concrete national precast. This research was conducted to establish fly ash concrete mixture proportions for highway paving work. The american coal ash association1 acaa conducts an annual survey of fly ash production and use. Stabilization of pavement subgrade by using fly ash activated by cement. A concrete ear is separated from the ramp or apron by an expansion joint made of 1 in. Moreover, in construction, the use of fly ash would result in the reduction of the cost of. Class f fly ash sources were eliminated from wisdot specifications in the 1990s due to high values of loss on ignition loi. High volume fly ash concrete hvfac for mass concrete and road pavements. Theoretical studies of pavement stresses and deflections by h.
Phase i fly ash use survey the purpose of this phase is to evaluate the past, current and future trends of use of fly ash in concrete and restrictions to its use. The national ready mixed concrete association nrmca was involved in 2 phases of this project. For 30% or less, abrasion resistance was comparable to that of the control mix. A targeted approach to highvolume fly ash concrete. Study of fly ash cement concrete pavement ssrgjournals. Pervious concrete, pervious fly ashcement concrete, mechanical properties, density, permeability, voids. Creep and shrinkage properties in concrete containing fly ash by mohand l. This manual is intended to assist airfield managers in understanding and rating the surface condition of rigid portland cement concrete pcc pavements. There are other advantages to using fly ash that result in a stronger and more durable pavement. Currently, fly ash is used in more than 50% of all ready mixed concrete placed in the united states, yet many design professionals continue to remain overly restrictive when it comes to using fly ash in concrete. This section includes exterior cement concrete pavement for the following. Studies of the properties of paver block using fly ash.
Creep and shrinkage properties in concrete containing fly ash. It describes types and causes of distress and provides a simple system to visually rate pavement condition. Class f fly ash for concrete pavement report 00921204 sponsored by the wisconsin highway research program coprincipal investigators daniel m. Fly ash in concrete pavement concrete construction.
Fly ash concrete pavement will improve the resistance of the concrete to sulfate attack. Mechanical properties of concrete containing recycled asphalt pavement and class c fly ash author. Greatly increased use of fly ash in hydraulic cement concrete hcc for pavement layers and transportation structures volume i final report to research consortium led by purdue university and funded by fhwa march 2012 prepared by karthik h. A technical analysis for compressive strength dr s l pati1 1, j n kale 2, s suman 3 address for correspondence 1head, applied science department, 2sr. Design and construction of a road pavement using flyash. Practical considerations may require that the fly ash content is limited during. This causes the concrete ear to move with the adjacent pavement and independent of the ramp or apron. Guidelines for the construction of fast track concrete pavement. Chapter 3 fly ash in portland cement concrete fly ash facts for. Pdf concrete pavement design guidance notes by geoffrey. These pavements were constructed in the mid1980s as nonreinforced, duallane, roads ranging in thickness between 200 mm and 300. From research, it has been observed that the use of 30% of fly ash and 70% of cement possess a superior performance. In 1974, the federal highway administration encouraged the use of fly ash in concrete pavement with notice n 5080.
The concrete incorporating the fly ashes is, therefore, considered stable. Resistance to freeze thaw since more strength is attained it can with stand more freeze thaw. A pozzolan material, such as fly ash, may be added to the concrete mix as a. Pdf stabilization of pavement subgrade by using fly ash. View irc60 lime fly ash concrete for pavement construction from civil engi 111 at shri ramdeobaba kamla nehru engineering college. Th is article addresses some optimal ways of specifying. Fly ash is a byproduct from coalfired power plants that is frequently used as an admixture in concrete to replace a portion of the portland cement. In the related previous research project 05110, best practices for concrete pavement spall repairs, researchers discovered that. Using ordinary material, calculating through the external addition method and then adjusting through experimental tests, the mixing proportion of cement mortar is determined.