class 1 vs class 2 aggregate base

Copy. Want to know what the best base material to use for pervious concrete is? Butte Sand and Gravels Class II Aggregate Base is the material that made Butte Rock famous. The base course is 6 inches, and the surface course is 1-1/2 inches. Type Use graded aggregate base, subbase, or shoulder course material of uniform quality. 3/4 Class 2 Recycled Base. A coarse aggregate, however, can have two parts; a coarse part and a fine part. 5.1 Clause reworded to improve clarity. At Port Aggregates, we use top-quality white limestone that has the same durability as gray limestone, but weighs 10% less. Class II base, subbase, and fill material specifications are less restrictive than those for portland cement concrete and asphalt concrete. Base Course in pavements refers to the sub-layer material of an asphalt roadway and is placed directly on top of the undisturbed soil (Sub-Grade) so as to provide a foundation to support the top layers of the pavement. They work very well for ditch lining in moderate flow areas. Therefore, they are safe and are exempt from beam-hazard control measures. When doing structural foundations or base course under concrete slabs and asphalt pavement roadways, Aggregate Base is in use. Compacts well. a PN, processed natural material; N, natural material; S, synthetic material b Natural aggregate listed for comparison. Meets specifications of both class 1 and class 2. Used effectively for temporary and permanent roads. Manufactured aggregate works wellcrushed recycled concrete aggregate can also work well. 0.25mm 0.06mm. You will also get to choose your size range, which is where limestone gradations come into play. a. 26 -1.02B Class 2 Aggregate Base Aggregate gradation must be within the percentage passing limits for the sieve sizes shown in the following table: 351 The physical requirements for coarse aggregate are as specified in Table 902-2 for Class 6AAA and the following: i. Previous Fig 2 (see below) renumbered as Fig 1. Class 4 Aggregate Base will sometimes glitch and take you a long time to try different solutions. Clay lumps: Less than 0.5 percent for Class I, and less than 2.0 percent for Class II, when tested in accordance with ASTM C142. Fine aggregat e. Size variation. Sutter, CA 95982. Description: 1 1/2 Inch Road Base. It is a well-graded blend of rock, sand and fines that, when compacted and graded properly, sets up extremely hard. Finally, click on the Calculate button. Available in two sizes (Class A: 3 5 inches and Class B: 4 8 inches). Penrice Quarry & Mineral supplies a large range of products for projects, small and large. C. Aggregates for Optimized Gradation. The Base Rock and Drain Rock selections will supply a default density of the rock; the Custom selection requires an entry for rock density in the Density field. 903.04-Aggregate for Lean Concrete Base. The crushed rock's 40% void content allows for water to pass through unrestricted, unlike the Class II Permeable which produces standing water. 201-1.1.2 Concrete Specified by Class and Alternate Class. Class I - (50 to 150 psi): Specified where the maximum strength is of primary concern due to the desire to have material that can be excavated in the future with relative ease. The Aggregate Base shall be Class ** and shall be as specified in Section 303 of the Standard Specifications, and Contracts and Specifications This allows for less material to cover more space, saving you money. 530-696-0211 fax. Caltrans identifies five different Subbase types (Class 1 thru Class 5) in Section 25 and three different Aggregate Base types ( & 1 Class 2, Class 3) in Section 26. Passing the No. Class 1 Type A Permeable is available at the A.R. At Port Aggregates, we use top-quality white limestone that has the same durability as gray limestone, but weighs 10% less. There is a wider range of possible sources for a Type 2 than permitted for a compliant Type 1 aggregate - Type 2 may also be sourced from natural sands and/or gravels. When the grading envelopes for a Type 1 and a Type 2 are superimposed, it becomes apparent that the Type 2 envelope is more generous, less restrictive than is the Type 1 envelope. 2. A more realistic maximum data rate for a single user is 1.2 Gbit/s (downlink) and 600 Mbit/s (uplink). Open-Graded Crushed Rock. 200 7% by mass NA 10.0% 10.0% 7.0% Max Shale, if No. Granular A or M produced with RAP containing steel slag aggregates is acceptable for unpaved shouldering purposes only. 1. (mm) Revetment Class 1 Class 2 Uniform A Uniform B 30 (750) 100 24 (600) 100 85-100 18 (450) 100 85-100 60-80 12 (300) 90-100 35-50 2. Class 2 aggregate base shall be free of vegetable matter and other deleterious substances. Coarse aggregate, material contained on the No. 4 sieve, shall consist of material of which 25 percent by weight shall be crushed particles. Each of these materials is differentiated by variations of Gradation, R-Value, and Sand Equivalent. The difference between granular A and granular B gravel is that, unlike pea gravel, it does have other materials with the stone. The calculated number of tons of aggregate will be returned. There is a wider range of possible sources for a Type 2 than permitted for a compliant Type 1 aggregate - Type 2 may also be sourced from natural sands and/or gravels. Use any mix designation listed in TABLE 611-2 for Class B. Metal: Use either flow-fill or Class 1** Plastic: Use flow-fill or Class 1. It is a clean material. 3 MATERIALS . It is typically made of a recipe of different sizes of aggregate rock inclusive of 1 to fine dust. LoginAsk is here to help you access Class 4 Aggregate Base quickly and handle each specific case you encounter. 2. Therefore, there are 1.491 cubic yards of Class 2 AB in 1 ton at 95% compaction. This allows for less material to cover more space, saving you money. Grading. The Aggregate Resources and 4 th street mines have about 50% crush stone in their 6A. It is also a good base for patios and drainage for flower gardens. 301.2 Materials 301.2.1 General (1) Provide coarse aggregates from a department-approved source as specified under 106.3.4.2. What is the Greenbook? Unstabilized granular bases concentrate loads on a small area. Wilson Quarry in Aromas. It is also used as the primary raw aggregate in ready-mixed concrete and some blacktop mixes. The crushed aggregate base lays on heavy traffic or driveways areas. Has stones in it that are usually 3/8" or smaller. 1. The Aggregate Base shall be Class ** and shall be as specified in Section 303 of the Standard Specifications. Data from the "Design and Control of Concrete Mixtures" book, states that the particle density of aggregate is between 150 and 180 (lb/ft^3). It can be placed by attentive spreading then compacting. Such materials shall be stockpiled separately. Aggregates. Note: The 3.0 Gbit/s / 1.5 Gbit/s data rate specified as Category 8 is near the peak aggregate data rate for a base station sector. Fine sand. Do not change your selected aggregate gradation without authorization. Soils/aggregates in cement-stabilized bases are tightly bound together by cement. Then, click on either Base Rock, Drain Rock, or a Custom Density material selection. It provides an excellent base to concrete pavers and asphalt or can be used alone as a driveway or pathway. 2 Crushed Granite Construction Entryway Rock (used for as a buffer from the construction site to the local roadways to keep construction materials off of the road) #7 Roof Rock (round) MN DOT Coarse Filter Aggregate 3149.2H. Manufactured aggregate works wellcrushed recycled concrete aggregate can also work well. 3. Table 4-2 is 7-1/2 inches. 6. 57 stone. Used for concrete. Weight per Cubic Yard: 1.60 Tons. # 690283. 20 mm or 3/4 inch Aggregate Base, Class 2, is used in roadways and is an aggregate made of a specific recipe of different sizes and quality of rock inclusive of 20 mm (34 in) to fine dust. The entire mass is hardened into a slab with enough rigidity and strength to spread loads over a large area of the subgrade. Class 1/class 2 quarry fill. 2. More specifically, a #57 aggregate is the combination of #5 and #7 aggregates ranging from 1 to 0.19 inch. Section 305. Aggregate Base is used as the base course under asphalt pavement roadways, under concrete slabs and structural foundations, and as backfill material for underground pipelines and other underground utilities within a roadway. It is placed by means of attentive spreading and compacting to a minimum of 95% relative compaction, It is a well-graded blend of rock, sand and fines that, when compacted and graded properly, sets up extremely hard. Class II (Fill Sand) Screened sand. To be classified as granular B gravel, 100% of the material must pass through a 150 mm sieve. Soils and Stone supply high-quality sub-base limestone and granite aggregate including Type 1 SHW Clause 803 (formerly MOT Type 1) and Type 3 Open Graded SHW Clause 805. The difference between the two is the size of the stone. 3/4 Class 1 Aggregate Subbase. Following are the classification of aggregates based on size: Aggregates are classified into 2 types according to size When the aggregate is sieved through a 4.75mm sieve, the aggregate passed through it called fine aggregate. a. Coarse aggregate includes all aggregate particles greater than or retained on the -inch sieve. Dense-graded HMA for thin lifts (usually 1 inch thickness or less). 703.04 Aggregate for Asphalt Concrete Base (301 and 302) 703.05 Aggregate for Asphalt Concrete (Intermediate and Surface Courses), Prime Coat (408), Chip Coat (422), and (76 mm) sieve, less than 50 percent passing the 1/2 inch sieve, and 0 to 20 percent passing the No. Want to know what the best base material to use for pervious concrete is? The percentage composition by weight of Class 1, Class 2, and Class 3 aggregate Coarse Sand. Item Number: 045. Fine Aggregate. Exceptions and additional requirements are specified in those sections. Color. This permeable base rock can be used in many applications where drainage is required. 4-2501 General. MN DOT Medium Filter Aggregate 3149.J1. MOT Type 1 otherwise known as DOT Type 1 is the most commonly used DfT approved sub-base in the construction sector. Aggregate base is designated as Class 2 or Class 3. Laser systems considered Class 1 are understood to be incapable of producing damaging radiation levels. The difference between granular A and granular B gravel is that, unlike pea gravel, it does have other materials with the stone. %) 42 40 Open-Graded Crushed Rock. Class II (100 to 300 psi): Specified where the minimum strength is of primary Named after the DfT specification for granular sub-base it must comply with the Specification for Highway Works, clause 803 (SHW 803). Class E was supplanted by the current Class 1 inch HMA Superpave mix design. Material shall meet the requirements in paragraph 407-2.1. Table 1014-1 Gradation for Lightweight Coarse Aggregates; Table 1016-1 Class II, Type 1 Select Material; Table 1016-2 Class III, Type 3 Select Material; Select Material Class IV, V, VI, and VII; Table 1019-2 Aggregate Shoulder Borrow; Table 1042-1 Rip Rap; Aggregate from Crushed Concrete; MSE Wall Special Provision. 301 Base, Subbase, and Subgrade Aggregate 301.1 Description (1) This section describes requirements common to sections 305 through 313 and 350. Our extensive resources allows us to quickly procure the base materials you need, have it transported and professionally installed. Coarse Aggregate Requirements. When the specified by class, concrete will be designated by a number, one or two letters, and a number. Heavyweight aggregates: Heavyweight concrete contains aggregates that are natural or synthetic which typically weigh more than 2,080 kg/m 3 and can range up to 4,485 kg/m 3.Heavy weight aggregate is most commonly used for radiation shielding, Wiki User. All materials except Aggregate Base Course (RAP) shall conform to the quality requirements of AASHTO M 147 except that the requirements for the ratio of minus 75 m shall not apply to Class 1, 2, and 3. One vendor has demonstrated downlink speeds of 1.4 Gbit/s using 100 MHz of aggregated spectrum. The Contractor shall provide the Engineer with at least six days advance notice of; his intention to commence the production of aggregates, the source of all aggregates to be used on the project including supplementary granular material. aggregate for granular base course. This sampling and testing will be the basis for approval of Large Open Graded Aggregate (AASHTO 1, Rip-Rap) = yd x 1.4 Well Graded Aggregate (2A, 2RC) = yd x 1.5 Driving Surface Aggregate or TSA = yd x 1.55 Shale = yd x 1.35 Topsoil /Dirt = yd x 1.2 Quick formulas for estimating tonnage of DSA required: For 6 loose lift compacted to ~4 = Rd Length x Rd Width x .029 The difference between the two is the size of the stone. Therefore I thought that somebody must have a more scientific approach to deal with this issue. To be classified as granular B gravel, 100% of the material must pass through a 150 mm sieve. 3.1 Source of Supply . Commonly Used for: Base for driveways. a. 530-696-2486. * SHW clause 600 class 1B and * SHW clause 600 class 1A. 1. Works well for drain fields and septic tanks. Fig title changed. The purpose of the fine aggregate is to fill the voids in the coarse aggregate and to act as a workability agent. Aggregate for Lean Concrete Base shall consist of crushed limestone, crushed slag, crushed or uncrushed gravel meeting the requirements of Subsection 903.05, for Class B, Grading D. The aggregate may be a "crusher or pit run" or may be sized into two or more sizes. 2. Class 2 aggregate base shall conform to one of the following gradings, determined in 3. Aggregate base is a construction aggregate typically composed of crushed rock capable of passing through a 20 millimetres ( 34 in) rock screen. Texas Aggregate & Base Materials can fill all your base material needs from recycled concrete, rip-rap, limestone, sand or gravel. The purpose of the fine aggregate is to fill the voids in the coarse aggregate and to act as a workability agent. Original customers of Joe Morehead Sr. called it concrete-like. This data refers to the "particle" density of aggregate. Prices are per tonne. Consisting of rock, sand, and clay. The fine aggregate shall not pass 45% from a single sieve and retained on the next consecutive sieve as shown in table-1. 4-2601 General. Add to Compare; Availability: 40mm sub base (loose) 12.00 (10.00 excl. approves otherwise or shown elsewhere in the Contract Documents, use a SM-12.5A or SR-12.5A (TABLE 611-2) for Class A. 1.1 Clause edited for brevity. (2) Class 2 must be composed of 100% crushed quarry rock, and (3) Conforms to the quality requirements of Table 3138-1. Medium sand. Job mix formulas (mentioned in Chapter 3) are not required. Caltrans SSPs allow up to 100% processed glass in Class 2 and 3 aggregate base, and also in Class 1, 2, and 3 aggregate subbases. For proper placement and compaction, the asphalt lift thickness should be at least 2.5 to 3.0 times the maximum particle diameter. Made from crushed rock or recycled aggregate. Class 1/class 2 quarry fill. Download Engineering Data PDF. Fig 1 flowchart and footnotes amended. Oversized Clean Crushed Concrete - 75mm-100mm (no fines) 1.2 Previous clause 1.2, including Fig 1, moved to Guide Notes. 2.0mm 0.5mm. 0.5mm 0.25mm. 24 1043-3 AGGREGATE SHOULDER BORROW 25 The material shall meet Section 1019. The Contractor shall take samples of the aggregate base stockpile in accordance with ASTM D75 to verify initial aggregate base requirements and gradation. Class 1 Type B Permeable is also available at the A.R. The LL of the material shall be raised 5 points to 23 no more than 35. It will not compact. For all pipe trenches in rock, a 12" layer of Backfill Class 1 is required beneath the pipe. The nominal maximum aggregate size is about 0.375 inches. It can consist of processing gravels; crushed stones; or blends of gravel, sand, and crushed stone materials each stabilized with a specified percentage of asphalt. This design feature is the primary difference between Class I and Class II Base Courses. See answer (1) Best Answer. 1. The component particles will vary in size from 20 mm down to dust. Use either 1-1/2-inch or 3/4-inch maximum aggregate gradation unless otherwise specified. Some clay. 1 1/2 Sewer Rock (round) 1 1/2 CA-1 Crushed Granite. Coarse aggregate, material contained on the No. Base Course in pavements refers to the sub-layer material of an asphalt roadway and is placed directly on top of the undisturbed soil (Sub-Grade) so as to provide a foundation to support the top layers of the pavement. Class 2 Permeable is available at Southside Sand in Hollister. Penrice is renowned for its white limestone and supplies it in the following sizes: AGGREGATES White Aggregates Poultry Grit, 3mm, 5mm, 7mm, 10mm, 20mm, 50mm Aggregates 3mm, 5mm, 7mm, 10mm, 20mm, 50mm, Gabion, Shot Rock Applications Concrete, Decorative FILTER FABRICS OR ENGINEERING FABRICS PER CALTRANS SPECIFICATIONS That is, aggregates which can be passed through a number 4 sieve, with a mesh size of 4.75mm. Metal: Use either flow-fill or Class 1** Plastic: Use flow-fill or Class 1. October 2007 Appendix D 1 APPENDIX D INDOT COURSE AGGREGATE SIZE SPECIFICATIONS Sieve Sizes Coarse Aggregate Sizes (Percent Passing) Coarse Graded Dense Graded 2 5 8 9 11 12 431 91 531 731 in. Class 5. 1. Classification of aggregates based on: Grain Size. 6F2. 301 Base, Subbase, and Subgrade Aggregate 301.1 Description (1) This section describes requirements common to sections 305 through 313 and 350. This product is made to meet Caltrans Class 2 base rock specifications for use under road surfaces. sample is taken in the field it is thought of as a coarse aggregate (like a base course) or a fine aggregate (like a silica or limestone sand). Class 1. Aggregates for Granular B shall be aggregates produced from one or a blend of the following, subject to the The fineness modulus of the fine aggregate shall be not less than 2.3 and more than 3.1. 26 1043-4 CLEAN COARSE AGGREGATE FOR ASPHALT 27 The material shall meet the gradation of a standard size in Class 6 Recycled Concrete Aggregate Base Course Gradation. Study now. Less than 7% silt. Class 2 aggregate base shall be free of vegetable matter and other deleterious substances. Medium sand. Unstabilized granular base Cement-stabilized base Figure 1.2. 1010.05.04 Granular B . HL 3 aggregates have a nominal maximum size of 13.2 mm, requiring a minimum mat thickness of at least 35 mm. 2.0mm 0.5mm. Other Names: Class 5 Type 3 Crushed Concrete - 0-63mm reduced fines. To get a good sample both parts must be properly represented. These laser products are designed explicitly for contact application to the skin or non-ocular tissue. Color: Brown. Fine sand. 0.25mm 0.06mm. 800-854-7222. 200 (75 m) sieve for Type C granular material. All of these reactions will ultimately damage the concrete making it an un-desirable or un-usable aggregate to work with. Class II Base. 200 > 7% by mass NA 7.0% 7.0% 7.0% A #1 aggregate is a nominal size of 3 to 1 inches and a #8 aggregate is a nominal size of 3/8 to 0.094 inch. An aggregate is normally made from newly quarried rock, or it is sometimes allowed to be made from recycled asphalt concrete. An approved trench backfill for City of Santa Rosa, this product has higher a sand equivalent than our standard subbase, giving it better compaction properties. Class 1/class 2 quarry fill. Bituminous Treated Aggregate Base Bituminous treated aggregate base is one type of cold mix Asphalt Concrete. Prequalified City of Aurora Type 2. Wilson Quarry in Aromas. Zoom. 301.2 Materials 301.2.1 General (1) Provide coarse aggregates from a department-approved source as specified under 106.3.4.2. There is a wider range of possible sources for a Type 2 than permitted for a compliant Type 1 aggregate - Type 2 may also be sourced from natural sands and/or gravels. Aggregates for bases shall meet the grading requirements of Table 703-2 for the class specified for the project, unless otherwise specified. Greenbook Specifications. Figure 1.3. Obtain the graded aggregate from an approved source or deposit that will yield a satisfactory mixture meeting (2 mm) sieve is Class A or B aggregate that meets the requirements of Section 800. Class 5 is primarily used for building foundations, parking lots, driveways, and asphalt. Fine aggregat e. Size variation. Organic impurities: No color darker than standard color when tested in accordance with ASTM C40. Class 5 generally contains less clay than class 1. b. Class 2 Aggregate Base: a. Granular B may be of Type I, Type II, or Type III. Fig 1 changed to table. This section provides guidelines for inspecting aggregate subbases for work specified under Section 25, Aggregate Subbases, of the Standard Specifications. Class G . It is also a good base for patios and drainage for flower gardens. October 2007 Appendix D 1 APPENDIX D INDOT COURSE AGGREGATE SIZE SPECIFICATIONS Sieve Sizes Coarse Aggregate Sizes (Percent Passing) Coarse Graded Dense Graded 2 5 8 9 11 12 431 91 531 731 in. The Quincy and Midway mine has round. 3.1 Definition of Nominated Mix deleted. This aggregate is defined by Clause 804 of SHW, but, in Ireland, the relevant clause of SRW is "803" and it is sometimes refered to as a Type A aggregate. The Class II Base Rock - Recycled is produced from 100 percent crushed concrete and asphalt concrete products. Both the recycled aggregate base and aggregate base meet Use this for your home project or get a truckload out to your cabin to build a driveway or a walking trail. 4 sieve, shall consist of material of which 25 percent by weight shall be crushed particles. Maximum 24 hour soak absorption of 2.50 percent; ii. Concrete: Use Class 1** with 3 inches of bedding material ** Backfill Class 2 may be specified only if material generated on the project meets the requirements for Class 1. This aggregate is defined by Clause 804 of SHW, but, in Ireland, the relevant clause of SRW is "803" and it is sometimes refered to as a Type A aggregate. Class II Base is a crushed and graded blend of aggregates designed to compact tightly with the proper equipment. You will also get to choose your size range, which is where limestone gradations come into play. It is designed to form a base for roads, parking lots, driveways and sidewalks. Aggregate subbase is designated by class. age of 28 days within the ranges required below for the specified class: 1. Coarse Sand. 0.6705 TN/Y^3 is the density of Class 2 AB at 95% compaction. 0.5mm 0.25mm. Section 501 Aggregate Base Courses 516 Section 502 Soil-Cement Base Course 520 Section 503 Chip Seal Surface Treatment 523 Fine aggregates include things such as sand, silt and clay. Aggregate for Class 1, Class 2, and Class 3 aggregate subbases shall be clean and free from vegetable matter and other deleterious substances, and shall be of such composition that it can be compacted readily under watering and rolling to form a firm, stable base. 900. Aggregate base materials. The interlocking capability of certain types of aggregates means that, even with a relatively thin sub base layer, the ability to carry heavy loads can be improved. (mm) Revetment Class 1 Class 2 Uniform A Uniform B 30 (750) 100 24 (600) 100 85-100 18 (450) 100 85-100 60-80 12 (300) 90-100 35-50 Best used as a sub-base for roads, underneath blocks, as well as layering in between concrete or tarmac and as a hard core for projects such as car parks. 20 mm or 3 4 in Aggregate Base, Class 2, is used in roadways and is an aggregate made of a specific recipe of different sizes and quality of rock inclusive of 20 mm (3 4 in) to fine dust. This product has similar characteristics to our 3/4 Virgin Aggregate Base, but it allows water to pass through easily. Type 1 Crushed Concrete - 50mm down to dust. 21 1043-2 AGGREGATE BASE COURSE 22 The material shall meet the ABC gradation. This section provides guidelines for inspecting aggregate bases for work specified under Section 26, Aggregate Bases, of the Standard Specifications. The fine aggregate shall consist of natural sand, manufactured sand, or a combination thereof. Exceptions and additional requirements are specified in those sections. C. ITEM - AGGREGATE BASE (Class 1 or 2) The Aggregate Base may consist of one or both of the following: 1. TABLE 611-1: HMA-COMMERCIAL GRADE CLASS A and CLASS B MIX CRITERIA CLASS A CLASS B AGGREGATE: Coarse Angularity (min.%) 75 50 Uncompacted Voids-Fine (min. This was WSDOTs standard base course paving mix that could also be used as a heavy duty surface mix. Download Engineering Data PDF Sieve Size Allied Test CDOT Spec Aurora Spec 1" 100 100 3/4" 99 95-100 1/2" 83 3/8" 73 50 85 #4 54 30 65 35 65 #8 42 25 55 #10 39 25 50 #40 17 15 30 #200 6. Class 1C. The sub-base if formed by dust and small chipped aggregate layers, typically Crushed Fines. Thickness Design 4-3 Residential Streets Traffic Class Subgrade Aggregate Concrete Concrete (ADT) Class CBR Base Base Surface Total II Good 9 5.0 .0 3.0 8.0 (50-200 ADT) Moderate 6 8.0 .0 3.0 11.0 Lightweight pieces: Less than 5 percent when tested in accordance with ASTM C123. The material can be made of virgin (newly mined) rock, or of recycled asphalt and concrete. Class I Base Courses that are stabilized with cement must always be produced in a central mix plant. Butte Sand and Gravels 1 Class II Aggregate Base is a version of aggregate base that simply contains larger rock than base. It is typically made of a recipe of different sizes of aggregate rock inclusive of 1 to fine dust. Contractor License. To provide the appropriate drainage and storage for your pervious concrete project specify a base of 3/4" crushed drain rock, or a no. For all pipe trenches in rock, a 12" layer of Backfill Class 1 is required beneath the pipe. 1.2 Units The values stated 8.1 aggregate standard size; coarse aggregate; screenings ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Table 3138-1 Quality Requirements for Virgin Materials Requirement Class 1 and 2 3 and 4 5 and 5Q 6 Max Shale, if No. 407-2.2 Sampling and testing. This material may also be used as sub-base for building foundations. Concrete: Use Class 1** with 3 inches of bedding material ** Backfill Class 2 may be specified only if material generated on the project meets the requirements for Class 1. If you separate aggregates by size, there are two overriding categories: The size of fine aggregates is defined as 4.75mm or smaller. These sections were updated in February 2007 to allow up to 100% recycled aggregate.

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