Recycled concrete aggregate (RCA) — produced by mechanically crushing and screening demolished concrete into spec-sized aggregate — is one of the highest-volume recovered material streams in modern construction. RCA serves as base material under roads and parking lots, drainage stone behind retaining walls and foundations, fill material under structures, and a host of other applications across construction, road building, and landscape supply markets. Produced correctly, RCA matches or exceeds virgin crushed stone performance for most non-structural applications while costing less to source, generating recovered revenue, and supporting waste-diversion mandates that increasingly govern commercial construction projects.
This guide is the comprehensive reference for recycling concrete aggregate — accurate technical characteristics (without the one-sided framing common in older content), application matching, the regulatory drivers (LEED v4, waste-diversion mandates) that increasingly favor RCA, the economics of producing RCA on-site, and how Komplet America’s compact mobile crushing and screening lineup supports RCA production for demolition contractors, recyclers, and aggregate operations.
What Is Recycled Concrete Aggregate (RCA)?
Recycled concrete aggregate is construction aggregate produced by mechanically crushing demolished concrete and screening the output into spec-sized fractions. The feed material includes structural concrete from building demolition, slab and foundation removal, sidewalk and pavement removal, parking lot demolition, bridge deck removal, and similar concrete deconstruction sources. The processing typically follows a four-stage workflow:
- Demolition — breaking concrete structures into pieces small enough to feed crushing equipment, typically using excavator-mounted hydraulic breakers for commercial-scale work
- Pre-processing — removing oversized pieces, foreign objects, and recoverable salvage materials. Rebar typically stays in the feed; modern crushers handle reinforced concrete with integrated magnetic separation
- Crushing — primary size reduction with a jaw crusher, optional secondary impact crushing for cubical particle shape if premium spec aggregate is the target
- Screening — separating crusher output into spec sizes (3/4″ base, 1-1/2″ drainage, fines, oversize) for resale or on-site reuse
The result is aggregate functionally similar to virgin crushed stone for most applications, with the embedded reinforcing steel recovered as scrap metal during the process.
RCA Technical Characteristics: What Actually Matters
RCA differs from virgin crushed stone in several measurable ways. Whether these differences matter — and whether they’re advantages or disadvantages — depends entirely on the specific application. The same characteristic that disqualifies RCA for one use can make it the preferred material for another.
Density
RCA typically has slightly lower bulk density than virgin crushed stone — roughly 1,800-2,000 lb/yd vs. 2,400-2,700 lb/yd for virgin granite. The lower density comes from residual mortar attached to aggregate particles and from the porous nature of older concrete. For applications where weight matters (riprap, ballast), virgin stone may be preferred. For most base material and fill applications, density isn’t a differentiator.
Water Absorption
RCA absorbs more water than virgin stone — typically 3-8% water absorption vs. 1-2% for granite. This characteristic is often framed as a disadvantage, but it’s situational. For drainage applications and base material under freeze-thaw conditions, the absorption can actually help by allowing better water management. For new structural concrete production, absorption matters because it affects mix design water content. For base aggregate, drainage stone, and fill, water absorption is rarely the limiting factor.
Particle Shape and Texture
RCA particles are typically more angular than virgin stone with rougher surface texture — actually advantageous for applications where particle interlock matters (compacted base, retaining wall fill, reinforced earth structures). The rough surface promotes mechanical bond in cement-treated bases and stabilized soil applications.
Compressive Strength
Used in NEW STRUCTURAL CONCRETE, RCA produces concrete with somewhat lower compressive strength than concrete made with virgin aggregate at the same mix design — typically 5-25% reduction depending on RCA percentage and quality control. This matters for structural applications. For non-structural uses (base, drainage, fill, riprap, sub-base, working pads), compressive strength of the resulting structure depends on compaction and gradation, not the parent aggregate’s intrinsic strength.
Gradation and Consistency
RCA gradation depends on crushing equipment, screening configuration, and feed material consistency. Properly produced RCA from a well-controlled crushing operation can match standard aggregate gradations (#57, #67, base specs) within state DOT tolerances. Gradation consistency is a function of the producer’s quality control, not an inherent RCA limitation.
Contaminants
RCA may contain residual material from demolition: small amounts of asphalt, brick, masonry, gypsum (drywall fragments), wood, plastic. Quality RCA producers control feed material composition and use magnetic separation, manual sorting at the demolition stage, and screening to maintain spec compliance. Contaminant tolerance varies by application — base material allows higher contamination than concrete-grade aggregate.
Where RCA Excels: Application Matching
Road Base and Sub-Base
The largest single RCA application. Most state DOTs allow RCA for road base, sub-base, and shoulder construction within specified limits. RCA’s angular particle shape and good compaction characteristics often make it preferable to virgin stone for these applications. Many state DOT specifications now explicitly allow or encourage RCA use for non-structural pavement layers.
Parking Lot and Industrial Pad Base
Commercial parking lots, industrial pads, equipment storage yards, and similar applications use RCA extensively as compacted base. The performance characteristics required (stable compaction, drainage, weight-bearing) align well with RCA properties.
Drainage Aggregate
French drains, foundation drainage, septic field stone, retaining wall drainage, and similar applications use 3/4″ to 1-1/2″ drainage spec RCA. The slightly higher water absorption of RCA can actually improve performance in freeze-thaw drainage applications.
Fill Material
Trench backfill, structural fill, embankment fill, and reclaimed land fill all use RCA effectively. Compaction characteristics and weight-bearing capacity meet most fill specifications when properly graded.
Driveway and Walkway Base
Residential and commercial driveways, walkways, and pathways use RCA as a compacted base layer under final surface materials (asphalt, concrete, pavers) or as the final surface for utility access roads.
Erosion Control and Riprap
Larger RCA fractions (3-6″ pieces) work as riprap for shoreline protection, drainage channel stabilization, and erosion control. Lower density compared to virgin stone matters less than overall mass placement for these applications.
Cement-Treated Base (CTB) and Soil Stabilization
RCA mixed with cement and water produces cement-treated base for road construction. The angular particle shape and rough surface texture support strong cement bond. Some state DOTs specifically prefer RCA over virgin stone for CTB applications.
Where RCA Is NOT Typically Used
Premium structural concrete (high-strength concrete for bridges, high-rise buildings); decorative landscape applications where appearance matters; some specialty drainage applications requiring specific permeability characteristics; concrete batch plants without specific RCA mix design qualification. For these applications, virgin crushed stone is typically preferred.
The Regulatory Drivers Pushing RCA Adoption
LEED v4 Materials and Resources Credits
LEED v4 awards Materials and Resources credits for documented C&D waste diversion and recycled content use. Operations producing RCA on-site capture both — diversion credits for the recycled material AND recycled content credits when that material gets used in subsequent project construction. Sustainable building certification programs increasingly include RCA-friendly provisions.
State and Municipal Waste-Diversion Mandates
Many state, county, and municipal jurisdictions mandate minimum C&D waste diversion percentages on commercial construction and demolition projects — typically 50-75% diversion. On-site RCA production provides measurable, documented diversion that contributes to compliance. Failure to meet diversion requirements can result in permit complications, fees, or project delays.
DOT Specifications Allowing RCA
State Department of Transportation specifications increasingly allow RCA for non-structural pavement layers — base, sub-base, shoulder construction, embankment fill. Some state DOTs specifically encourage RCA for sustainability and cost reasons. Specifications vary by state; check with the relevant DOT for current allowances on your projects.
Environmental Compliance
Operations using RCA reduce demand on virgin aggregate sources (limestone, granite, basalt quarries). For environmentally-sensitive markets, RCA usage demonstrates resource conservation that supports environmental compliance reporting. Some federal and state environmental programs offer specific incentives for recycled aggregate use.
The Economics of RCA Production
Avoided Tipping Fees
Concrete tipping fees in major US metros run $50-$100+/ton. A 1,000-ton commercial demolition project pays $50,000-$100,000+ in dump fees if hauled to disposal. On-site crushing eliminates most of this cost — the largest single economic driver of RCA production for demolition contractors.
Recovered Material Revenue
RCA sales typically generate $15-$30/ton depending on spec size and regional market. Recovered ferrous metal (rebar) sells for $100-$300+/ton as scrap. For a 1,000-ton concrete project, recovered material revenue typically runs $15,000-$45,000+ on top of dump-fee avoidance.
Avoided Aggregate Purchase
Operations using on-site RCA for base material under their own subsequent construction work eliminate aggregate purchase costs. For a contractor using 2,000+ tons of base aggregate annually at $25/ton, that’s $50,000+ in avoided purchases.
Project Schedule Compression
On-site RCA production eliminates haul-out trips, dump waiting time, and post-demolition site cleanup time. Demolition projects with on-site recycling typically complete 10-30% faster than haul-out alternatives. Faster completion means lower overhead absorption per project and faster crew rotation.
Equipment Financing
Komplet Capital offers 24-hour approval, 100% financing, and 3-6 year terms. Many demolition contractors structure financing so monthly payments are fully covered by avoided dump fees alone — meaning the equipment has $0 net operating cost while producing additional revenue from RCA and ferrous metal sales. New equipment qualifies for Section 179 tax deduction up to $1.22M (2024 limit).
Komplet America’s RCA Production Lineup
Compact Mobile Jaw Crushers (Primary Reduction)
- K-JC 503 — up to 34 US tph, 19″ x 12″ jaw, ~7,496 lb. Tight-access urban demolition. Approximately $108,695.
- K-JC 604 — up to 55 US tph, 23″ x 16″ jaw, ~19,400 lb. Approximately $205,030.
- K-JC 704 PLUS — up to 90 US tph, 27″ x 16″ jaw, ~26,455 lb. Komplet’s best-selling crusher — the workhorse for typical contractor RCA production. Approximately $241,255.
- K-JC 805 — up to 160 US tph, 31″ x 21″ jaw, ~49,600 lb. Largest jaw crusher in the lineup, for high-volume RCA production.
Compact Mobile Impact Crusher (Premium Cubical RCA)
- K-IC 70 — up to 90 US tph, 25″ x 20″ feed, 100 HP. For premium cubical RCA suitable for concrete and asphalt mix designs. Add to a jaw crusher workflow when premium spec output is the target market.
Vibrating Scalping Screeners (Spec Size Production)
- Kompatto 221 — up to 90 US tph, two-deck. Approximately $104,935.
- Kompatto 5030 — up to 280 US tph, hydraulic 2-way / 3-way conversion. Komplet’s best-selling screener — the natural pair for the K-JC 704 PLUS. Approximately $209,061.
- Kompatto 124 — up to 350 tph. Largest mobile scalping screen. Approximately $268,070.
Standard Features That Matter for RCA Production
- Hydraulic magnetic belt (K-JC 604, K-JC 704 PLUS, K-JC 805) — automatically lifts rebar from demolition concrete; recovered metal becomes scrap revenue
- Reverse jaw function — clears uncrushable jams in seconds via wireless remote
- Standard dust suppression — water-spray system for OSHA crystalline silica compliance (PEL of 50 ug/m3 over 8 hours)
- Tier 4 Final emissions compliance — current emissions standard for construction operations
- Hydraulic 2-way / 3-way conversion (Kompatto 5030 and 124) — switches between 2 and 3 RCA spec sizes in minutes for different customer requirements
Frequently Asked Questions
Is RCA as good as virgin crushed stone?
For most non-structural applications (road base, parking lot base, drainage, fill, riprap, sub-base) RCA performs comparably to virgin crushed stone — and in some applications (cement-treated base, retaining wall fill where particle interlock matters) it can perform better. For premium structural concrete production, virgin spec-controlled aggregate is typically preferred. The answer depends on the specific application; for the majority of aggregate uses in commercial construction, RCA is a fully acceptable substitute that often costs less.
Can I use RCA in new structural concrete?
Possible but specialized. Some state DOT specifications and high-performance mix designs allow specific RCA percentages in structural concrete — typically 10-30% replacement of coarse aggregate, with corresponding mix design adjustments. The qualification process is more rigorous than for non-structural applications. Most commercial RCA production targets non-structural applications where the qualification overhead doesn’t apply.
How does the rebar in demolition concrete get handled?
Komplet jaw crushers (K-JC 604, K-JC 704 PLUS, K-JC 805) include integrated hydraulic magnetic belts that lift ferrous metal off the discharge conveyor automatically during crushing. The reverse jaw function clears any uncrushable material that enters the chamber. Together these features handle reinforced concrete without manual rebar removal — and the recovered rebar typically sells as scrap metal at $100-$300+/ton, adding revenue while keeping RCA cleaner.
What spec sizes does RCA typically come in?
The same spec sizes as virgin crushed stone: crusher run / dense-graded base (0 to 1-1/2″ mix), 3/4″ minus base, #57 stone (3/4″ to 1″), #67 stone (3/4″ minus, concrete-grade), 1-1/2″ drainage, 2″+ riprap, fines/screenings. Producers screen the crusher output into multiple spec sizes simultaneously using vibrating scalping screens with appropriate mesh configurations.
How does RCA help with LEED certification?
LEED v4 awards Materials and Resources credits for both documented C&D waste diversion and recycled content use in new construction. On-site RCA production captures both: diversion credits for the recycled demolition material, plus recycled content credits when that RCA gets used in subsequent project work. The documentation requirements (waste reports, supplier certifications, hauling records) need to be maintained throughout the project lifecycle.
Do I need a permit to produce RCA on-site?
Demolition permits are typically required by local building authorities for commercial concrete demolition. Crushing demolition concrete for use on the same project (or a closely related project) is generally permitted under standard construction activities. Operating as a commercial recycler accepting outside material requires state-level permits in most jurisdictions. Consult local building authorities and a local environmental attorney before launching commercial concrete recycling operations as a standalone business.
How long does it take to produce RCA from a demolition project?
Highly variable based on project size and equipment. Reference points: a typical 1,000-ton demolition project (medium commercial building or large parking lot) processed with a K-JC 704 PLUS jaw crusher and Kompatto 5030 screener typically completes crushing and screening in 2-5 working days after demolition. Larger projects scale proportionally; smaller projects compress.
Can I rent RCA production equipment for a single project?
Yes. Komplet works through a dealer and rental network across North and Central America. Find your local Komplet dealer or call 908-369-3340. Many partners offer rent-to-own arrangements where rental payments credit toward eventual purchase. Rental is typically the right starting point for contractors testing RCA production economics on real projects before committing to ownership.
Final Thoughts
Recycled concrete aggregate is one of the most consequential material streams in modern construction — economically valuable to produce, environmentally important to capture, regulatory-favored across an increasing number of jurisdictions, and technically suitable for the dominant aggregate applications in commercial construction. The technical characteristics that distinguish RCA from virgin stone matter for some applications (premium structural concrete) and don’t matter for others (base, drainage, fill, riprap). Operations matching the right RCA characteristics to the right application — rather than treating all aggregate uses as identical — capture the real economic and environmental value of recycling concrete.
Komplet America’s compact mobile crushing and screening lineup — jaw crushers from K-JC 503 through K-JC 805, the K-IC 70 impact crusher for premium cubical output, and the Kompatto 221, 5030, and 124 vibrating scalping screens — covers RCA production from tight-access urban demolition through high-volume aggregate recycling. Browse the complete equipment lineup or call us to discuss whether on-site RCA production fits your operation.
Ready to Talk RCA Production?
- Call 908-369-3340
- Email [email protected]
- Schedule a demo or request a quote
- Find your local Komplet dealer for rental availability
- Ask about our 1-year / 1,000-hour warranty and equipment financing options
Never enough — that’s how we approach service, support, and helping operations turn demolition concrete into spec aggregate revenue.
Disclaimer: All cost, ROI, payback, dump fee, scrap pricing, and revenue figures in this article are illustrative examples based on sample assumptions about volume, regional pricing, material specifications, and market conditions. Actual results vary significantly by region, market, material type, equipment utilization, operator skill, financing terms, regulatory environment, and many other factors. Equipment pricing, tipping fees, RCA pricing, scrap metal pricing, fuel costs, and interest rates all change over time and by location. Komplet America makes no guarantee, warranty, or representation of specific financial performance, payback timelines, or business outcomes for any particular operation. For current pricing and a payback estimate based on your specific volume, material, and local market, contact us at 908-369-3340 to speak with our team.
