Answer: Bituminous concrete is made using aggregate 19 mm down upto size finer than 75 microns. Well graded . Best quality surface layer. Binder content is 5.4 min and can be upto 6 % . Layer thickness 30 to 40 mm generally.Binder is Bitumen or modified Bitumen. Cement or Lime 2 % or in few cases...

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Hot Rolled Asphalt (HRA) is a dense mixture of mineral aggregate, sand, filler and bitumen that complies with EN 13108 and the TII Specification for Road Works. There is a high proportion of sand in the mix resulting in a low percentage of air voids when it is compacted. The mortar of bitumen, sand & filler gives it strength. On public roads high PSV chippings are added to provide a skid ...

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Macadams (Asphalt Concrete) : This material can be a dense, medium or open graded blend of aggregate filler and bitumen. Recipe or Designed materials are classified in three layer categories of Surface Course 0/6mm to 14mm, Binder/Base Courses/14mm to 0/32mm. Hot Rolled Asphalt (HRA) : This material is a dense mixture of asphalt sand course ...

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The use of SMA is rapidly gaining the support of highway engineers in the UK and is, in particular, an intriguing, alternative solution to chipped hot rolled asphalt in many situations. This paper examines the case for continued use of SMA in the UK. Introduction

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HRA General designation for Hot Rolled Asphalt. Hot Rolled Asphalt is a dense, gap graded bituminous mixture in which the mortar of fine aggregate, filler and binder are major contributors to the performance of the laid material. The designation of HRA is followed by an indication of the coarse

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Asphalt concrete (commonly called asphalt, blacktop or pavement in North America, and tarmac, bitumen macadam, or rolled asphalt in the United Kingdom and the Republic of Ireland) is a composite material commonly used on roads, parking lots, airports, and core of embankment dams.

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Hot rolled asphalt is prepared in site plants heating the aggregates and bitumen at 160°C and is placed and compacted normally at not less than 125°C. Thus the energy requirements for the preparation, placement and compaction of HRA is very high. ... and SMA are the most commonly used asphalt materials for road paving in European countries ...

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Stone matrix asphalt (SMA) is a gap-graded HMA (Figure 1) that is designed to maximize deformation (rutting) resistance and durability by using a structural basis of stone-on-stone contact (Figures 2-6). Because the aggregates are all in contact, rut resistance relies on aggregate properties rather than asphalt binder properties.

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Hot Rolled Asphalt (HRA) An asphalt mixture of gap-graded aggregate, filler aggregate and bitumen binder proportioned to a design or recipe to produce a dense and impermeable surfacing material. Interlock Effect of frictional forces between concrete blocks that …

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Hot Rolled Asphalt TS2010 SMA Surface Course Thin Surface Course System Porous Asphalt Generic SMA Slurry/Microsurfacing Note 1: Refer to Overseeing Organisation on rigid construction Table 2.2S (Scotland): Permitted Pavement Surfacing Materials for New and Maintenance Construction .

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design of asphalt pavement materials, which started with the publication in 2001 of the Interim Guidelines for the Design of Hot-Mix Asphalt (IGDHMA) in South Africa. This move is in line with international best practice and also enables the formulation of national specifications that will

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Stone Mastic Asphalt (SMA) was starting to become popular in the UK about seven years ago (1998) and its use has increased a lot since. It is seen as a cost effective alternative to conventional hot rolled asphalt (HRA ). Conventional HRA is paved hot and then, before compaction, coated chippings are

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Nominal layer thickness 30-45mm. ULTICOLOUR coloured asphalts are BBA HAPAS accredited for use on UK highways as a coloured thin surface course. Tarmac's road surfacing solutions are available as either a stone mastic asphalt (SMA), hot rolled asphalt or as coloured pre-coated chippings.

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HMA Mix Types. The most common type of flexible pavement surfacing in the U.S. is hot mix asphalt (HMA). Hot mix asphalt is known by many different names such as hot mix, asphalt concrete (AC or ACP), asphalt, blacktop or bitumen. For clarity, this Guide makes a conscious effort to consistently refer to this material as HMA.

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A2.1 Hot Rolled Asphalt (HRA) Mixtures. ... A2.2 Stone Mastic Asphalt (SMA) Mixtures. 1) SMA shall conform to BS EN 13108-5 and PD 6691. Conformity shall be established in accordance with BS EN 13108-20 and BS EN 13108-21.The following SMA mixtures are permitted by this Specification, depending upon the detail requirements of the relevant ...

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Concrete" (AC), 'Hot Rolled Asphalt' (HRA) or 'Stone Mastic Asphalt' (SMA), is applied in its generic sense to refer to the range of mixtures used in the UK. Asphalts are used in games and sport areas in two ways: i as the final surfacing layers over an appropriate base, which may also be an asphalt mix, or

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Hot mix asphalt is composed of aggregate bound together into a solid mass by asphalt cement. The aggregates total ninety-three (93) to ninety-seven (97) percent by weight of the total mixture and are mixed with three (3) to seven (7) ... 9.5mm SMA PG76-22 80 gyrations 1.5" ...

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The "smooth" surfacing you refer to is stone mastic asphalt, the older rough stuff is hot rolled asphalt - it's more complex than that but essentially the stone mastic asphalt (SMA) is laid thinner 20-40mm and has less technical issues in terms of laying, whereas the hot rolled asphalt involves throwing chippings onto the just laid material and rolling them in, this gets a little more complex ...

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section 3 gives guidance on other ancillary processes. Section 4 contains a list of asphalt mixes. * For the purposes of this document the term 'asphalt' is used throughout in the generic sense to refer to the range of mixtures as used in the UK; Asphalt Concrete (AC) Hot Rolled Asphalt (HRA) Stone Mastic Asphalt (SMA)

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This procedure covers the determination of asphalt binder content of hot mix asphalt (HMA) by ignition of the binder in accordance with AASHTO T 308-10. Overview The sample is heated in a furnace at 538°C (1000°F) or less; samples may be heated by convection or direct infrared irradiation (IR). The aggregate remaining after burning can be

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* The term 'asphalt' is used in this publication and unless accompanied by a descriptor for example "Asphalt Concrete" (AC), 'Hot Rolled Asphalt' (HRA) or 'Stone Mastic Asphalt' (SMA), is applied in its generic sense to refer to the range of mixtures used in the UK.

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Stone Mastic Asphalt (SMA) is a high strength material that produces a surface that in many instances out-performs that of traditional Hot Rolled Asphalt (and pre-coated chippings where required). These materials are particularly suited to sites of high stress, such as lorry parks, industrial areas, Motorways, Trunk Roads etc.

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Hot Rolled Asphalt (HRA) with chippings on the left and a 6mm close-textured bitmac (AC dense surf) on the right . ... Asphalt (SMA/HRA) machine-laid as a wearing course on public roads. [1] [1] - HRA on high speed roads is increasingly being replaced with SMA (Oh how we love these acronyms!) which is Stone Mastic Asphalt. This is a denser ...

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Stone matrix asphalt (SMA) is a tough, stable, rut-resistant mixture that relies on stone-on-stone contact to provide strength and a rich mortar binder to provide durability [1]. These objectives are usually achieved with a gap-graded aggregate coupled with fiber or polymer modified, and high asphalt …

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Introduction to the Tarmac range of asphalt products. Ever since Tarmac invented the modern road surface in 1902, we have been at the forefront of developing innovative pavement solutions that help construction professionals deliver outstanding results. The Tarmac range of asphalt products are the result of our pursuit of ultimate paving ...

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The most popular rolled roofing rolls material is oil-based asphalt. However, you can also make other materials into rolled roofing rolls. These other materials can include pure rubber, rubber mixed with sawdust and slate dust (also known as EPDM), and a coherent mixture of polypropylene and ethylene-propylene based rubber (also known as TPO).

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SMA is best explained as two-component hot mix asphalt HMA which comprises a coarse aggregate skeleton derived from a gap-graded gradation and a high bitumen content mortar. Since 1960s, Stone Mastic Asphalt (SMA) pavement surfaces have been used …

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30% 14mm Hot Rolled Asphalt. A very close textured and hard wearing surface course normally used for carriageways and industrial estates where heavier usage is anticipated. Will resist static turning from heavy vehicle and forklift trucks. 20mm precoated chippings are rolled into the surface for skid resistance. Normally laid 35-45mm thick

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pavement. Traditionally, overlay materials have included hot rolled asphalt surfacing courses, macadams, slurry surfacings etc. Modern road courses such as SMA, Thin Surfacings, and Porous Asphalts tend to be laid much thinner than traditional surfacings and place greater reliance on the inter-surface bonding layer to reduce the risk of

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Stone Mastic Asphalt (SMA) Hot Rolled Asphalt (HRA) Porous Asphalt (PA) Double layered Porous Asphalt (2L PA) Mastic Asphalt (MA) Soft Asphalt (SA) The selection of the surface course is a matter of identifying the most appropriate material during the …

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