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17.06.2015
Set a Reminder and we'll send you an email when it's time to stock up on items you buy regularly or seasonally, like air filters, fertilizer or mulch. Domestic Ready Mix Concrete Services in Surrey and South LondonAdvantage Concrete Company is proud to provide a one-stop shop for all your domestic concrete requirements in Surrey and South London.
Whether you are laying a concrete base for a garden shed, creating a path or driveway or laying foundations for your home extension, we look forward to helping you with your project.
By mixing your concrete on site, you only pay for what you use, saving you money and eliminating wastage. The Right Ready Mix Concrete for Your JobAdvantage Concrete offers ready mix concrete and screed in a variety of different grades. Helping You All The WayNot only will we supply you with top quality concrete or screed at a competitive price, we can also help you lay it too. If you don’t fancy the hard slog of barrowing your concrete from our lorry to your job site, we offer a barrow and lay service where we provide the tools and labour to do the job for you.
Reclaimed asphalt pavement (RAP) can be used as an aggregate in the hot recycling of asphalt paving mixtures in one of two ways. Although some form of pavement recycling had been practiced as early as 1915,(3) the first sustained efforts to recover and reuse old asphalt paving materials were conducted during 1974 in Nevada and Texas.(4) Bolstered by the sponsorship of the Federal Highway Administration (FHWA), more than 40 states performed and documented RAP demonstration projects between 1976 and 1982. RAP is now routinely accepted in asphalt paving mixtures as an aggregate substitute and as a portion of the binder in nearly all 50 states. The use of processed RAP to produce conventional recycled hot mix (RHM) is the most common type of asphalt recycling and is now considered standard asphalt paving practice. The maximum limit for RAP content in RHM produced in conventional hot mix asphalt batch plants is widely considered to be 50 percent, limited by both the heat capacity of the plants and gaseous hydrocarbon emissions. Table 13-3 provides a 1996 list of State Department of Transportation (DOT) specification requirements for the use of RAP in hot mix asphalt paving mixtures. While all state highway agencies permit the use of RAP in base and binder courses, 10 agencies do not permit the use of RAP in surface courses.
States that approve the use of RAP in surface courses generally permit from 10 to 30 percent RAP.
The use of hot in-place recycling (HIPR) has developed rapidly over the past decade, although it is in use only on a limited basis. The first two processes involve removal, rejuvenation, and replacement of the top 25 mm (1 in) of the existing pavement.
The major advantage of HIPR is the cost savings that it can potentially achieve over conventional recycled hot mix, eliminating the costs associated with transporting, processing and stockpiling RAP.
Not all states have experience in HIPR applications, although HIPR technology is a fairly well accepted practice. The survey of HIPR experience at the state DOT level further indicated that the use of the three different HIPR processes has been fairly evenly divided, with 13 states having had some experience with heater-scarification, and 16 states each having some experience with either the repaving or the remixing process. Reclaimed asphalt pavement must be processed into a granular material prior to use in hot mix applications.
In the HIPR process, the surface of the pavement must be softened with heat prior to mechanical scarification.
Some of the engineering properties of RAP that are of particular interest when RAP is incorporated into new asphalt pavements include its gradation, asphalt content, and the penetration and viscosity of the asphalt binder. Gradation: The aggregate gradation of processed RAP is somewhat finer than virgin aggregate. Asphalt Content and Properties: The asphalt content of most old pavements will comprise approximately 3 to 7 percent by weight and 10 to 20 percent by volume of the pavement.
Recycling and rejuvenating agents can be divided into three main types: "super-soft" asphalt cements, napthenic (aromatic) oils, and paraffinic oils. Procedures for selecting the quality of asphalt cement or recycling agent are outlined in ASTM D4887.(21) This specification includes a viscosity blending chart, which enables the designer to determine the percentage of recycling or rejuvenating agent (or soft asphalt cement) to add to the total binder in order to achieve a desired value of absolute viscosity for the recycled asphalt cement. The Asphalt Institute suggests that when 20 percent or less RAP is used in a mix, no change in asphalt grade is required.
The Asphalt Institute’s manual on mix design methods for asphalt concrete(22) provides a method to determine necessary mix design characteristics (such as stability, flow, and air voids content) for either the Marshall or the Hveem mix design methods.
Additional virgin aggregates may be required to satisfy gradation requirements to improve stability and to limit the RAP content in recycled hot mixes. Conventional AASHTO pavement structural design methods are appropriate for asphalt pavements incorporating reclaimed asphalt pavement in the mix. Mix design procedures for HIPR are not as well established as those for conventional recycled hot mix. The material properties of the existing asphalt pavement (to at least the depth of scarification) should be determined prior to construction in order to permit any necessary adjustments to aggregate gradation to develop the required voids in mineral aggregate (VMA) and selection of the appropriate viscosity binder. Unlike conventional recycled hot mix where the RAP is combined with a significant amount of new aggregate material (making up typically between 60 to 80 percent of the RHM), HIPR may involve up to 100 percent recycling of the existing pavement.
The amount of rejuvenating agent that can be added through HIRP is limited by the air voids content of the existing asphalt. The type of recycling or rejuvenating agent and the percentage to be added to the binder can be estimated using procedures outlined in ASTM methods D4552(20) and D4887.(21) The recycling or rejuvenating agent, if used, should be compatible with the recycled and new asphalt binder. HIPR is generally considered a rehabilitation technique for addressing superficial pavement distress to a maximum depth of about 50 mm (2 in). RAP is produced by milling, ripping, breaking, crushing, or pulverizing types of equipment. Experience has proven that conical stockpiles are preferred to horizontal stockpiles and will not cause RAP to re-agglomerate in large piles. RAP stockpiles are typically left uncovered because covering with tarps can cause condensation under the tarp and add moisture to the RAP stockpile. When large quantities of RAP from different sources are available, it is advisable to keep stockpiles separated and identified by source.
In a batch plant operation, the RAP is usually added to superheated new aggregate at the pugmill.


In a batch plant, typical RAP substitution rates are limited by the heat capacity of the plant and the ability to superheat the aggregate to temperatures that will produce a suitable mix temperature.
To produce consistently high-quality recycled hot mix asphalt, the need for systematic quality control of the RAP is essential. The same field testing procedures used for conventional hot mix asphalt mixes should be used for mixes containing reclaimed asphalt pavement. There are three basic HIPR construction processes in use: heater scarification, repaving, and remixing. Heater scarification involves a plant that heats the pavement surface (typically using propane radiant heaters), scarifies the pavement surface using a bank of nonrotating teeth, adds a liquid rejuvenating additive, then mixes and levels the recycled mix using a standard auger system. The remixing process is used when additional aggregates are required to improve the strength or stability of the recycled asphalt concrete.
The initial step in the quality control of hot in-place recycled mixes is in the selection of the pavement to be recycled. Next, as noted in the Mix Design section, field core specimens should be analyzed in the laboratory to determine (based on the asphalt content, viscosity, and penetration of the recovered binder) the required amount of rejuvenating agent to be added to the mix in order to attain the desired viscosity of the recycled mix. Field core specimens should also be evaluated for air voids content during the pavement selection process. Field quality control measures during HIPR operations include monitoring the depth of scarification, the temperature of the recycled mix, the visual appearance and homogeneity of the scarified or milled RAP, the compaction procedure, and the visual appearance of the recycled pavement surface after compaction. While the asphalt pavement recycling technologies are well established, there is still considerable need for additional performance information, particularly with regard to creep (rutting resistance), fatigue endurance and durability, and the use of reclaimed asphalt pavement in premium surface course mixes. We are manufacturing different types of plants and their related equipments in our latest modern company Continental, for making construction goods like Base Bricks, Blocks, Interlocking Blocks, Industrial Road Pavers, Interlocking Tiles, Curb Stone, Precast Drainage, and many more of customer's needs and requirement as per ISI Standers, by use industrial solid waste. The Mix and Match 9100 Series Create-a-Cart with Gray Concrete Top 48'' Wide by Home Styles wood base is available in Natural, White, Black, Oak or Cherry finish with an innovative light-weight aged finished concrete top.
Aggregate Base is used as the base course under asphalt pavement roadways, under Portland cement concrete slabs and structural foundations, and as backfill material for underground pipelines and other underground utilities within a roadway. The Sub-Base is the layer of fined chipped aggregate material, typically Crusher Fines,which is laid above the ABC. Our friends at Buddy Rhodes shared this project on their Facebook page and we were so enamored with it and the other projects that this lady has done that we wanted to share it further. Framing the base with a seam down the middle was what Margot describes as the biggest mistake in the project.
No ProblemUsing our modern Volumetric Concrete Mixing Vehicles, we specialise in on-site concrete mixing. If you’re not sure of the correct concrete specification for your project then speak to our friendly customer service team who will be happy to help. Substitution rates of 10 to 50 percent or more, depending on state specifications, are normally introduced in pavements, and recently developed technology has even made it possible to recycle 90 to 100 percent RAP in hot mix. There are abundant technical data available indicating that properly specified and produced recycled hot mix asphalt is equivalent in quality and structural performance to conventional hot mix asphalt in terms of rutting, raveling, weathering, and fatigue cracking. These include Alaska, Florida, Hawaii, Louisiana, Maine, Maryland, New York, Oklahoma, Rhode Island, and Tennessee. Simple heater-scarification units, heat reforming systems, and special techniques have been developed for heating, scarifying, rejuvenation, and remixing of up to 50 mm (2 in) in depth of aged old asphalt pavement to new hot mix quality overlay in one pass. The remixing process involves incorporating virgin hot mix with the recycled paving material in a pugmill and placement to a depth of 50 mm (2 in).
Since only the top 50 mm (2 in) of pavement can normally be reconditioned using this process, HIPR applications are limited to roadways that do not have any structural deficiencies and do no not require additional materials. There are 32 states that report having some experience with HIPR, although 22 of these states consider their use of HIPR to be experimental. A typical RAP processing plant consists of a crusher, screening units, conveyors, and stacker.
The HIPR process has evolved into a self-contained, continuous train operation that includes heating, scarifying, rejuvenator addition, mixing, and replacement. Due to oxidation aging, the asphalt cement has hardened and consequently is more viscous and has lower penetration values than the virgin asphalt cement.
These products consist of organic compounds derived from petroleum extracts during petroleum hydrocarbon processing. The Asphalt Institute’s manual on asphalt hot mix recycling also provides trial mix design examples that indicate how to use a viscosity blending chart to design a recycled hot mix.
However, for mixes with greater than 20 percent RAP, a drop in one grade (softer asphalt cement) is recommended to compensate for the greater viscosity of the oxidized binder.(1) Many states use the same grade of asphalt cement regardless of the RAP content.
The final mix design proportions for the recycled hot mix paving mixture will be determined by completing mix design testing using standard procedures to satisfy applicable mix design criteria. This will require coring of the pavement to be recycled and laboratory testing of the recovered paving samples. Consequently, the extent to which the existing pavement can be improved or modified is limited by the condition and characteristics of the old mix. When the air voids content of the old asphalt mix is too low to accommodate sufficient recycling agent for proper rejuvenation or softening of the old asphalt binder without mix flushing, it may be necessary to add additional fine aggregate or to beneficiate with virgin hot mix to open up the mix or increase the air voids.
To ensure that the final RAP product will perform as intended, inspection of incoming RAP with rejection of contaminated loads (excess granular material, surface treatment, joint sealant, etc.) should be undertaken. However, because of the variability of RAP in comparison with virgin aggregates, many agencies do not permit the blending of RAP from different projects into combined stockpiles.
Consistent RAP from a "composite" or "blended" pile can be produced using a crushing and screening operation and reprocessing stockpiles that come to the yard from different sources. Exposure of the RAP to temperatures above this limit can result in excessive hydrocarbon emissions (blue smoke).
In drum-mix plants, RAP is usually introduced with new aggregate into the drum using a dual feed system. The process should be monitored for processed RAP moisture content, gradation, and asphalt cement content.(26) Controlled plant operations have been developed to produce a consistent (homogeneous) RAP.


Scarified or milled RAP is blended with rejuvenator and new virgin aggregate or new hot mix asphalt, then placed by a compacting screed. If too much rejuvenating agent (1.0 percent or more by weight of mix) must be added in order to attain this viscosity, the mix should probably not be recycled in place. An existing pavement being considered for HIPR should have an air voids content in excess of 6 percent, in order to accommodate the addition of a rejuvenating agent without the loss of stability in the recycled mix. There is also a need for more correlation of field and laboratory measurements to refine guidelines for laboratory prediction of field performance (for instance, laboratory curing procedures that best simulate field conditions).
Drawing and manufacturing complete range of construction gods manufacturing plants and their related equipments. This kitchen cart features include four utility drawers; two cabinet doors open to storage with adjustable shelf inside, handy spice rack with towel bar, paper towel holder, and heavy duty locking rubber casters for easy mobility and safety. Base Course in pavements refers to the sub-layer material of an asphalt roadway and is placed directly on top of the undisturbed soil so as to provide a foundation to support the top layer(s) of the pavement. It is placed by means of attentive spreading and compacting to a minimum of 95% relative compaction, thus providing the stable foundation needed to support a pathway,foundation,driveway or roadway.
She lives in Illinois but attended the World of Concrete 2015 event in Los Angeles over the first week of February. Margot's husband is leveling out the base and giving it an edge (what you are seeing at the top is actually the base when it's done). Recycled hot mix asphalt mixtures also generally age more slowly and are more resistant to the action of water than conventional hot mix asphalt.
Special plants based on microwave technology have been developed to limit gaseous emissions from hot mix asphalt production using very high RAP contents (up to 100 percent RAP), but the cost of heating is much higher than that of conventional systems. Allowable binder and base course aggregate substitution rates range from 10 to as high as 70 percent in one state (Arkansas).
The 10 states that have the most experience with HIPR are Arkansas, Colorado, Florida, Kansas, Maryland, New York, Ohio, Texas, Utah, and Virginia. It is desirable to produce either a coarse or a fine fraction of processed RAP to permit better control over input to the hot mix plant and better control of the mix design.
The selection of the appropriate addition (either fine aggregate or virgin hot mix), and the amount to be added, are determined by Marshall or Hveem mix design methods. Some jurisdictions also require that RAP from a particular project not be blended or commingled with RAP from other projects. This crust tends to help shed water, but is easily broken by a front-end loader, and may help keep the rest of the pile from agglomerating. Material handling machinery, such as front-end loaders and bulldozers, should be kept from driving directly on the stockpile. In a drum mix plant, from 30 to 70 percent RAP can be added, with a practical limit of 50 percent, due to hydrocarbon emission limitations that may be exceeded if excess RAP is introduced. Extraction tests to monitor the RAP gradation and asphalt cement content, and penetration and viscosity tests on the recovered asphalt cement, should be performed regularly to monitor the RAP characteristics for comparison with the job mix formula and enable appropriate adjustments to the mix. The process is limited in its ability to repair severely rutted pavements, which are often overlaid with conventional hot mix asphalt. Cores of the pavement being considered for HIPR must be taken during the early planning for the project.
Raipur is a industrial town which is famous for power and steel plants and is well connected with air and train routes from al metro towns like New Delhi, Mumbai, Kolkata and Chennai. Margot writes, "With Buddy Rhodes system you are working upside down placing handfuls of material at a time gently 'twisting' as you place them, leaving 'pockets' as you fill in your form.
The project turned out so well that this seam doesn't "seem" to detract from it at all!
The processed RAP used in recycled hot mix asphalt should be as coarse as possible and the fines (minus 0.075 mm (No. The cores should first be visually examined for pavement problems such as delaminations, stripping, or stripping potential, or water in the voids or delaminations.
Hot In-Place Recycling of Asphalt Concrete, National Cooperative Research Program Synthesis of Highway Practice 193, Transportation Research Board, Washington, DC, 1994.
An aggregate is normally made from newly quarried rock, or it is sometimes allowed to be made from recycled asphalt, or Portland cement concrete.
A A This heifer appears to have missed being part of that unusual activity known as "cattle mutilations" . She told her husband she wanted an oval-shaped vanity base in their small hallway bathroom. For many traditional bathrooms not having storage here would not work, but because Margot's bathroom was a little hallway bathroom and not the main or master bath, this was just fine with her. Therefore, low, horizontal, flat stockpiles are subject to greater moisture accumulation than tall, conical stockpiles.
Pavements with delaminations, especially saturated delaminations, in the top 5 cm (2 in) should not be considered for HIPR projects. She says she's planning to finish a bathroom in her basement eventually and will do another vanity project similar to this one, but with storage. Gentle RAP crushing (controlled crusher speed and clearance adjustment on exit gate) is recommended to minimize the fracture of coarse aggregate and excess fines generation.
Also, pavements that have been rutted, heavily patched, or chip-sealed are not good candidates for HIPR projects.
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