Rebar Alternatives Save Big $$$

Contact Us

Fill out the form below to request more information from our Bladensburg location.



    View our privacy policy

    MD: Bladensburg (HQ)

    (301) 927-8300

    4700 Annapolis Road, Bladensburg, MD 20710, USA

    Mon-Fri 6:30AM to 4:00PM Saturday 6:30AM to 12:00PM Sunday CLOSED

    Get In Touch with someone at MD: Bladensburg (HQ)
    (301) 927-8300






      Response time within 4 hours

      SRW Design: Expert Level

      Aaron Fisher | March 29, 2021

      Are you an architect, engineer, or contractor looking for more technical information as you design and install a segmented retaining wall (SRW)?

      Guidance Manual

      NCMA Guides

      One of the best places to look for more information on SRW construction is the National Concrete Masonry Association (NCMA)

      Software Tools

      Interested in designing an SRW, but don’t want to do the reading. There are several good software packages out there

      Design Standards of SRW Block (ASTM C1372)

      • Dimensional tolerances: ±1/8 in. (except for architectural finished surfaces)
      • Minimum Compressive Strength = 3,000 psi
      • Maximum Absorption = 15 – 18 pcf

      Freeze-Thaw Resistance of SRW Block (ASTM C1262)

      SRW Exposure Map

      Exposure ZoneSRW PropertiesFreeze/Thaw  Testing (C1262)
      Zone 1 and Non-Roadway ApplicationsASTM C1372None
      Zone 2 –

      no/negligible de-icing salt exposure1

      ASTM C1372Proven field performance or test in water:

      •≤1% wt. loss in 5 of 5 samples after 100 cycles; or

      •≤1.5% wt. loss in 4 of 5 samples after 150 cycles.

      Zone 2 –

      de-icing salt exposure

      ASTM C1372, plus

      • Targeted compressive strength: 4000 psi

      • Targeted absorption: 7 pcf

      Test in 3% saline solution:

      •≤1% wt. loss in 5 of 5 samples after 20 cycles; or

      •≤1.5% wt. loss in 4 of 5 samples after 30 cycles.

      Note: Only Zone 1 & 2 are shown because Ernest Maier does not service any regions that fall in Zone 3. Please see the Best Practices Guide for more information.

      Minimum Design Standards

      Appropriate design of an SRW should include a minimum safety factor. These are the minimum recommended safety factors.

      SRW Design Requirements

      Geosynthetic Reinforcement

      Design Guidance

      Use these design tables to understand how much reinforcement to place in your SRW

      Wall Height ft (m)Reinforced Zone MaterialDesign and Layout Criteria
      GradationPlasticityReinf. Spacing, Max.L/H, min.Gravel Fill Thickness in. (mm)
      H ≤10

      (H ≤ 3)

      RecommendedSee Table BelowModerate24 in.0.624 in. (610 mm) from face

      12 in. (305 mm) behind unit

      AlternateSee Table Below

      #200 waived

      Moderate16 in.0.730 in. (762 mm) from face

      18 in. (457 mm) behind unit

      10 < H ≤ 20

      (3 < H ≤ 6)

      RecommendedSee Table BelowLow24 in.0.6Top 10 ft (3 m) same as

      above, remainder 36 in.

      (914 mm) from the face, 24

      in. (610) behind unit

      H > 20

      (H > 6)

      RecommendedSee Table BelowLow24 in.0.6Top 10 ft (3 m) and lower 10

      ft (3 m) to 20 ft (6 m) same

      as above, remainder 48 in.

      (1219 mm) from the face,

      36 in. (914 mm) behind unit

      Sieve SizePercent Passing (Short/Medium Walls) Percent Passing (Tall Walls)
      1 in. (25 mm)100100
      No. 4100 – 0100 – 20
      No. 400 – 600 – 60
      No. 2000-350-15 with PI<6

      Material Choice

      The proper use of geosynthetics, can compensate for many other imperfections, mistakes, or oversights in the design of an SRW. Be sure to select materials that provide the recommended material strength and are permeable to water.

      An interesting application that showcases the power of geosynthetic reinforcement is: Geosynthetic Reinforced Soil- Integrated Bridge Systems (GRS-IBS). These are basically just SRW blocks with geotextiles every layer that are used for smaller bridges <140’ spans. These solutions are accepted by the FHWA and DOTs around the country.

      Geosynthetic Reinforced Soil Integrated Bridge System Interim Implementation Guide, January 2011 - FHWA-HRT-11-026

      Geosynthetic Reinforced Soil Integrated Bridge System

      Drain Design

      There are several drainage design options

      • Blanket Drain- runs underneath the reinforced soil zone- used to address the presence of migratory subsurface water
      • Toe Drain- located behind/below the SRW blocks- removes water from behind the blocks
      • Heel Drain- located at the base of the interface of the reinforced and retained soil zones- drainage structure to further reinforce the
      • Chimney Drain- located at the interface of the reinforced and retained soil zones- used to address high water tables or the presence of migratory subsurface water

      Toe and Heel Drain Detail

      Chimney and Blanket Drain Details

      Ernest Maier, Gomoljak Parker Block, and Skyline Brick have professional sales representatives who in many cases have served as contractors and installers ourselves. Feel free to reach out with your questions.

      VP of Business DevelopmentAaron Fisher

      Location
      MD: Bladensburg (HQ)
      Languages
      English

      Latest News

      Ernest Maier and Gomoljak Counter Price Sheet

      Ernest Maier and Gomoljak Counter Price Sheet

      Pricing accurate as of 4/18/2022 and valid for Annapolis, Bladensburg, and Gaithersburg locations (contact us for bulk pricing and delivery): […]

      Read More
      Masonry Veneer Installation System- Cost Savings Calculator

      Masonry Veneer Installation System- Cost Savings Calculator

      Use this calculator to determine your potential savings when using Laticrete’s Masonry Veneer Installation System (MVIS) over traditional lath and […]

      Read More
      Climate Change is Changing Construction

      Climate Change is Changing Construction

      Climate change is supercharging natural disasters. While not new, the frequency and severity of the natural disasters that occur is […]

      Read More
      Fiberglass Rebar- Saving You $$$

      Fiberglass Rebar- Saving You $$$

      Steel prices going up? Ernest Maier is now stocking fiberglass rebar to save you money. <50% cheaper for 20 feet […]

      Read More
      Winner of the 2022 Top Workplaces Award for Leadership

      Winner of the 2022 Top Workplaces Award for Leadership

      “ Bladensburg MD, April 28, 2022 – Ernest Maier, a Mid-Atlantic based construction material manufacturer and distributor, has been recognized […]

      Read More