Nofines concrete backfill can be used with any of the allan block retaining wall collections. In the hardened state, aggregate particles are covered by a thin layer of cement paste and are in pointtopoint contact with each other. Jul 15, 2014 no fines concrete no fines concrete may be defined as concrete mixtures containing little or no fine aggregate. Although nofines concrete was used as early as the nineteen twenties, its possibilities were not fully investigated until the shortages of the postwar period stimulated interest in forms of construction which economised in building materials.
However, numerous site constraints did not allow enough clearance to install geogrid reinforcement within the property limits. Basically no fines concrete consists of coarse aggregates and cement without any fine aggregates. No fines concrete is generally made with the aggregatecement ratio from 6. Aug 31, 2015 the no fines concrete consists of cement, coarse aggregate and water. Applicability of nofines concrete as a road pavement. No fines concrete is a composite building material consisting of a constituent material in the form of coarse aggregate, portland cement, and water. No fines concrete does not pose any serious problem for compaction. The quantity of cementitious material is approximately 500 lbyd. As the name implies, nofines concrete does not contain sand or fine aggregate.
This would give a far better adhesion tying the nfc. The coarse aggregate should preferably be a singlesize material nominal maximum sizes 10mm and 20mm being the most common. Assess the no fines concrete for soluble salt content in accordance with annexure 3222e within 12 months from the date of closing of. The co 2 induced corrosion behavior of no fines concrete manufactured with three different strength classes and reinforcements is compared. Nofines concrete backfill typically consists of cement, fly ash, water and coarse aggregate. Pdf nofines concrete in the uk social housing stock. It is essential that no fines concrete should be designed with a certain amount of voids to enhance thermal insulation. As the name implies, no fines concrete does not contain sand or fine aggregate. Dec 23, 2016 as nofines concrete doesnt segregate, it can be dropped from a considerable height and placed in very high lifts. The permeability of no fines concrete is extra because it having more voids. Pdf corrosion behavior of reinforced nofines concrete. Nfc is used to greatly increase gravity wall heights. No fines concrete no fines concrete may be defined as concrete mixtures containing little or no fine aggregate. No fine concrete has been in use in many countries over more than a century.
No fines concrete normally is not used in reinforced concrete. Because of these great differences in rate of shri n k a g e, care must be taken when using combined nofines and denseconcrete constru c t i o n. Applicability of no fines concrete as a road pavement page i abstract considerable research has been conducted on environmentally sustainable development. Following are the however the limitations of the nofines concrete. May 05, 2015 no fines concrete is a special type of concrete with a high porosity used for concrete flatwork applications that allows water from precipitation and other sources to pass directly through, thereby reducing the runoff from a site and allowing groundwater recharge. Woodland heights, a 30unit townhome association built in the 1980s, needed to replace its second timber retaining wall. Better insulating characteristics than conventional concrete because of the presence of large voids. Specifications for using nofines concrete with modular. This however needs similarly research and tribulations earlier than authentic implementation. Nofines concrete is a form of lightweight porous concrete, obtained by eliminating the sand from the normal concrete mix. No fine concrete also called porous concrete, permeable concrete, and porous. The paper presents a laboratory study to determine the relationship between compressive strength of no fines concrete nfc and its tensile strength measured both by doublepunch test and modulus.
Nofines concrete consists solely of normal portland cement, water and coarse aggregate. Nofines concrete is a nonproprietary material used widely in england and scotland for the construction of walls in dwellings. Typically pervious concrete has little to no fine aggregate and has just enough cementitious paste to coat the coarse aggregate particles while preserving the interconnectivity of the voids. The nofines concrete consists of cement, coarse aggregate and water. The main results showed that black steel corrodes with rates three times higher with respect to those. The size of these voids should be large enough to avoid the movement of moisture in the concrete section by capillary action.
Thus the fine aggregate or sand is eliminated and such concrete has been adopted for castinsitu external load bearing walls of single and multistorey houses, small retaining walls, dampproofing subbase material, etc. No fines concrete is a combination of coarse aggregate, cement, and water. No fines concrete can not be tested for workability by using tests for normal concrete such as slump or compaction factor test. The power of no fines concrete is a good deal while compared to ordinary concrete, however enough for structural use of pathways, parking areas etc. Pervious concrete is traditionally used in parking areas, areas with light traffic, pedestrian walkways, and greenhouses. No fines concrete is, as the name indicates, concrete consisting of coarse aggregate, cement and water fines being omitted entirely. The compressive strength of no fines concrete is considerably lower than that of conventional portland cement concrete and varies between 200 to 2000 psi 1. Pdf the paper presents a laboratory study to determine the relationship between compressive strength of nofines concrete nfc and its. The wimpey no fines house was a construction method and series of house designs produced by the george wimpey company and intended for massproduction of social housing for families, developed under the ministry of works postworld war ii emergency factory made programme. Nofines concrete definition of nofines concrete by. Both monolithic and block constructions were tested, each made from two different aggregates, representative of high. No fines concrete is a concrete containing little or no fine aggregate. One of the main advantages of no fines concrete results from its relatively low hydrostatic pressure when wet. Boral no fines permeable concrete, when placed correctly, absorbs rainwater and facilitates natural runoff into the ground or storage tanks.
Its higher porosity helps in percolating rain water directly to ground and thereby helps in recharging groundwater aquifer. It has good drainage properties due to its open texture. Pdf mechanical properties of nofines concrete researchgate. The coarse aggregate may be any of the usual type or the light weight aggregate. No fines concrete, as the name implies, is simply a concrete product that doesnt contain sand or fine materials. The cement shall comply with the requirements for use in readymix concrete astm c94. Keywords no fines concrete, watercement ratio, cement. No fines concrete is literally thatconcrete made without fine aggregate so it has high permeability and drainage capacity. High strength permeable pavement using no fines concrete.
Allan block retaining walls and nofines concrete no problem. Nofines concrete is not suitable for use in reinforced concrete. This form of lightweight concrete is generally a crushed rock or gravel of 20 mm single size aggregate 1020 coated in a cement slurry with no fine aggregate addition. Nofine concrete has been in use in many countries over more than a century. No fines concrete is one type of light weight concrete. The fine aggregate is not added in this concrete so that there are voids left in the coarse aggregate. No fines concrete, also known as porous, pervious, permeable and cellular concrete, is a porous concrete obtained when fine aggregate is omitted. The water to cement ratio for no fines concrete should range between 0. Investigations on some properties of nofines concrete. At each contact point the paste forms a small fillet. No fines concrete is a material containing graded coarse aggregate, generally of a single as sieve size, bonded together by a paste of cement and water sufficient to provide adequate strength while producing an opentextured cellular concrete with a high volume of voids and high permeability. The phrase no fines relates to the name of the type of concrete that was used in the construction of this system of house building.
Nofines concrete is a concrete containing little or no fine aggregate. It has been used in europe and the united kingdom since the 1930s for the building of single story and multistory dwellings, but had found little acceptance in north america. Nofines concrete is becoming popular because of some of the advantages it possesses over the conventional concrete. The coarse aggregate should preferably be a singlesize material nominal maximum sizes. Specifications for concrete normally include a requirement for a certain design strength level for test cylinders cured for 28 days, or they are based on a prescription of a specified cement content. Mechanical properties of no fines concrete for pathways. Pdf mechanical properties of no fines concrete for pathways. As the name indicates, this a concrete mix without fine aggregate or sand. Concrete is bought and sold by the cubic metre volume of the freshly mixed ingredients. Investigations on some properties of no fines concrete t abadjieva and p sephiri department of civil engineering university of botswana private bag 0061 gaborone, botswana abstract no fines concrete is a form of lightweight porous concrete, obtained by eliminating the sand from the normal concrete mix.
This has lead to the use of no fines concrete in place of conventional concrete and asphalt surfaces. No fines concrete, when conventional aggregates are used, may show a density of about 1600 to 1900 kgm3, but when no fines concrete is made by using lightweight aggregate, the density may come to about 360 kgm3. No fines concrete backfill can be used with any of the allan block retaining wall collections. Nofines concrete is a form of lightweight concrete obtained when fine aggregate is omitted, i.
Use of mechanical compaction or vibratory methods are not required. Values of workability and its test methods are unknown. Pdf study of properties and strength of nofines concrete. There are several uses for this open textured and voided material typically as a lightweight concrete fill or as a drainage medium. The most widespread applications of no fines concrete include road paving, and surface treatments to permit water drainage. A 10inch nofines wall, re n d e r ed externally and plast e r ed intern a l l y, has a heat transmission value of 0. Nfc is used to greatly increase gravity wall heights while maintaining a minimal excavation depth. No fines concrete nfc consists of coarse aggregate and cement paste. No fines concrete backfill typically consists of cement, fly ash, water and coarse aggregate.
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