Experimental study on properties of nofine concrete. Nofines concrete sometimes referred to as porous or opentextured concrete is a concrete consisting of cement, coarse aggregate and water. It has good drainage properties due to its open texture. The main characteristics of this type of lightweight concrete is it maintains its large voids and not forming laitance layers or cement film when placed on the wall.
Investigations on some properties of nofines concrete t abadjieva and p sephiri department of civil engineering university of botswana private bag 0061 gaborone, botswana abstract nofines concrete is a form of lightweight porous concrete, obtained by eliminating the sand from the normal concrete mix. The water absorption of coarse aggregate is 2% and free moisture in fine aggregate is 1%. Calcrete concept dynamic thermal properties calculator passive design assistant tool concrete. Nofines concrete is a lightweight concrete produced by omitting the fines from conventional concrete. Nofines concrete definition of nofines concrete by. Results of a laboratory study of nofines pervious concrete for paving are presented.
No fines concrete typically consists of cement, water and coarse 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. Very often only single sized coarse aggregate, of size passing through 20 mm retained on 10mm is used. It may therefore be possible to fix light loads signs, rain water goods to. No fines concrete is obtained by eliminating the fine material sand, from the normal concrete mix.
The quantity of cementitious material is approximately 297 kgm. So the walls are basically a solid mass of grey concrete full of pebbles like a giant rice crispies cake. These free templates for powerpoint provide backgrounds that resemble strong structures made of substances like metal and bricks to help you deliver your concrete ideas using slide designs that symbolically reflect strength and resilience. The compressive strength of nofines concrete is considerably lower than that of conventional portland cement concrete and varies between 200 to 2000 psi 1. May 05, 2015 no fines concrete is obtained by omitting fine aggregate fraction from the conventional concrete. Concrete technology notes pdf ct notes pdf eduhub sw. Very often only single size of coarse aggregate,of size passing through 20mm and retain on 10mm is used. Shotcrete is a concrete convyed through a o pneumatically projected at high velocity surface, as a construction technique hose and on to a it is reinforced by conventional steel rods, steel mesh, o and fibers. No fines concrete is a method of producing light concrete by omitting the fines from conventional concrete. Nofines concrete is a method of producing light concrete by omitting the fines from conventional concrete. Advantages, limitations and mix proportions of no fines concrete is discussed.
It consist of cement, coarse aggregate and water only. This concrete has an open structure with a high void content and fairly low cement content. However, in a number of these situations, srws can still be the most effective solution when used in conjunction with no fines concrete nfc. No fines concrete draining water no fines concrete is increasingly being installed to improve storm water quality and reduce runoff produced by urban settings. The aggregate shall all pass a sieve having openings in square and not more than 5 per cent by weight shall pass a sieve having openings iin square. It is not uncommon to have a site where traditional geogrid reinforced sections will not work. Nofines concrete is a concrete containing little or no fine. The properties of hardened concrete are strength and durability. 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. The coarse aggregate should preferably be a singlesize material nominal maximum sizes 10mm and 20 mm being the most common. Woodland heights, a 30unit townhome association built in the 1980s, needed to replace its second timber retaining wall. Concrete that is sloppy or wet may be easy to place but will be more difficult to finish.
Ppt concrete formwork powerpoint presentation free to. Designing with no fines concrete and ab walls design. The singlesized coarse aggregates are surrounded and held together by a thin layer of cement paste giving strength of concrete. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Pervious concrete is traditionally used in parking areas, areas with light traffic, pedestrian walkways, and greenhouses. The density of this product will vary with the density of the aggregate used, but will typically range between 100 lbft. Ninet y six cylinders of 4 x8 sizes have b een tested i n the l. Recommendations are made regarding appropriate uses for this type of concrete. No fines refers to the type of concrete used concrete with no fine. It can also minimise saturation of the storm water network, reducing the risk of flooding in heavy rain events. No fines concrete backfill is designed using 38 34 in. This concrete is a mixture of cement, corse aggregate and with or without sand.
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. Free concrete powerpoint templates provide concrete themed ppt backgrounds with images such as a brick wall and textured designs. Designing with no fines concrete and ab walls design software. The house is a wimpey no fines which was built using shuttering and poured in situ concrete, which consists of only concrete and aggregate with no sand hence the name no fines. Uniformly distributed voids are formed throughout its mass. Cement will comply with the definitions for cement per as39721991 portland and blended cements. Applicability of nofines concrete as a road pavement. The basic mix propo rtion for nofines pervious concrete is ce ment, coarse aggregate and water. No fines concrete concretebasics building excellence. Hardened concrete will have no footprints on it if walked on. 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. Walls made from this type of concrete are plastered on both sides to prevent air drafts. Pdf study of properties and strength of nofines concrete. Retaining solutions no fines concrete gravity walls.
Nofines concrete is obtained by eliminating the fine material sand, from the normal concrete mix. Pdf some properties of nofines concrete produced by using. No fines concrete is obtained by omitting fine aggregate fraction from the conventional concrete. Nofines refers to the type of concrete used concrete with no fine aggregates. Including polypropylene fibers in the pervious concrete mix resulted in significant. No fines concrete usually used for both load bearing and nonload bearing for external walls and partitions.
Based on site constraints and project goals, duffy engineering and associates. By using single size aggregate, voids can be increased. Nfc is used to greatly increase gravity wall heights while maintaining a minimal excavation depth. This concrete is tested for its properties, such as slump value, porosity and compressive strength. Applicability of nofines concrete as a road pavement core. Nofines concrete definition is porous concrete made without the use of fine aggregate. 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 post world war ii emergency factory made programme. Pervious concrete is traditionally used in parking areas, areas with light traffic, pedestrian walkways, and.
No fine concrete has been in use in many countries over more than a century. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. However, numerous site constraints did not allow enough clearance to install geogrid reinforcement within the property limits. The earliest application of nofines concrete dates back to 1852 when two houses and a seagroin of 61 m 200 ft long and 2. Nofines concrete is becoming popular because of some of the advantages it possesses over the conventional concrete. If an attempt is made to construct a pervious pavement using conventional concrete placing techniques and procedures, the project will be less than satisfactory. Nofines concrete is not suitable for use in reinforced concrete. Ppt high strength concrete powerpoint presentation free.
Knocking through wimpey no fines in situ concrete house. Research paper investigation of nofines concrete in building. The basic mix propo rtion for no fines pervious concrete is ce ment, coarse aggregate and water. No fines concrete is used mainly for erecting cast or largeblock exterior walls of buildings in regions rich in local gravel or rock for crushed rock in the absence of other inexpensive wall materials. Results of a laboratory study of no fines pervious concrete for paving are presented. The analysis was undertaken by conducting a number of standard concrete tests and comparing the characteristics of the nofines and conventional. Advantages of nofines concrete following are the advantages of nofines concrete. Pervious concrete is known as no fines, gap graded or porous concrete. Dec 23, 2016 the nofines concrete consists of cement, coarse aggregate and water. Research paper investigation of nofines concrete in. Building technology ppts other ppts environmental engineering ppts structural engineering ppts transportation engineering ppts. Development of nofines concrete pavement applications. Nofines concrete backfill is designed using 38 34 in.
Here you can download the free lecture notes of concrete technology pdf notes ct pdf notes with multiple file links to download. Compressive strength test of nofines concrete by anush k figures available via. Investigations on some properties of nofines concrete. The performance of nofines concrete was compared with a concrete sample that is comparable to the material used for the construction of conventional concrete road pavements. Jan 15, 2018 no fines concrete a special type of gapgraded concrete also known as pervious concrete it is made by eliminating the utilization of fine aggregate completely and only a uniform size of coarse aggregate is used. Nofines concrete is a concrete containing little or no fine aggregate.
Pervious concrete is a versatile nofines material that requires unique, but not difficult, construction techniques and tools. One of the main advantages of no fines concrete results from its relatively low hydrostatic pressure when wet. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Nofines concrete concrete produced from a mix of solid or porous mainly uniformfraction gravel or crushed stone, a binder portland cement or slag. No fines concrete, as the name implies, is simply a concrete product that doesnt contain sand or fine materials.
The base coat of rendered walls generally has a good bond to the nofines concrete. No fines concrete definition is porous concrete made without the use of fine aggregate. 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. Nofines concrete nofines concrete can be defined as a lightweight concrete composed of cement and fine aggregate. This concrete is made up of only coarse aggregate, cement and water. Nofines concrete backfill typically consists of cement, fly ash, water and coarse aggregate. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Cement may be replaced by about 1030% of fly ash, 2050% blast furnace slag and 5% of silica fume. 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. Its extensive use came about after world war ii when nearly the whole of europe was in vast housing need. 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. No fines concrete a special type of gapgraded concrete also known as pervious concrete it is made by eliminating the utilization of fine aggregate completely and only a uniform size of coarse aggregate is used. Winner of the standing ovation award for best powerpoint templates from presentations magazine. The wimpey nofines 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.
No fines concrete is literally thatconcrete made without fine aggregate so it has high permeability and drainage capacity. Nofine concrete has been in use in many countries over more than a century. The total shrinkage of nofines concrete on drying is about half that of a dense concrete made with the same a g g re g a t e. The nofines voided concrete without sand construction technique for buildings is not particularly suited to drilling of holes to provide adequate fixings. Allan block retaining walls and nofines concrete no problem woodland heights, a 30unit townhome association built in the 1980s, needed to replace its second timber retaining wall. Some properties of nofines concrete produced by using demolished concrete as recycled. Nofines concrete article about nofines concrete by the. The srw industry expects to see geogrid lengths equal to at least 60% of the total height of the wall. Its higher porosity helps in percolating rain water directly to ground and thereby helps in recharging groundwater aquifer.
Hardening state after concrete has set it begins to gain strength and harden. The quantity of cement is specified as 210kgm3 with a total watercement ratio between 0. No fines concrete as the term implies, is a kind of concrete from which the fine aggregate fraction has been omitted. The weight of nofines concrete depends on the type of aggregate used. Nofines concrete as the term implies, is a kind of concrete from which the fine aggregate fraction has been omitted. The bulk density of coarse aggregate is 1600 kgm3 and fineness modulus of fine aggregate is 2. No fines concrete is a lightweight concrete made up of only coarse aggregate, cement and water by omitting fines sand or fine aggregates from normal concrete. Ppt high strength concrete powerpoint presentation. Nofines concrete usually used for both load bearing and.
The nofines concrete consists of cement, coarse aggregate and water. A no fine concrete mixture should be discharge completely within one hour after initial mixing. The earliest application of no fines concrete dates back to 1852 when two houses and a seagroin of 61 m 200 ft long and 2. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. The use of retarding chemicals admixtures or hydrationstabilizing admixtures may extend discharge time to 12 hours or more. Conclusions are drawn regarding the percentage of air voids needed for adequate permeability, the optimum watercement ratio range, and the amounts of compaction and curing required. Allan block retaining walls and nofines concrete no problem. In general, howe ve r, the nofines mix will be only about twothirds of the weight of a dense c o n c r ete made with the same aggre g a t e. 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. Provides free draining pavements for light traffic. No fines concrete is, as the name indicates, concrete consisting of coarse aggregate, cement and water fines being omitted entirely. During the last few years, no fines concrete has attracted more and more attention in concrete industry due to the increase awareness of environmental protection. Pieces shall be dean, hard, strong, durable, preferably rounded or nearcubicle and free from any coating of dust, day or.
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