Concrete and asphalt debris is the largest material stream in commercial demolition and pavement renovation work. Hauling that material off-site costs significant tipping fees, hauling charges, and dump waiting time — costs that compound across every project. Small compact jaw crushers like Komplet America’s K-JC 503 and K-JC 704 PLUS convert that debris on-site into recycled concrete aggregate (RCA) and recycled asphalt pavement (RAP) — turning the disposal cost stream into a recovery revenue stream while compressing project schedules.
This basic guide walks through how small compact jaw crushers process concrete and asphalt debris — the mechanical principles that make jaw crushers ideal for these materials, verified specs for Komplet’s small jaw crushers, the standard productivity features that handle real demolition feed (rebar, foreign objects, mixed material), Komplet’s in-person demonstration program at the Hillsborough, NJ headquarters, and how the K-JC 503 and K-JC 704 PLUS deliver economic returns for typical demolition contractor operations.
How Compact Jaw Crushers Process Concrete and Asphalt
Jaw crushers reduce material through compression between fixed and moving jaw plates. The moving jaw approaches the fixed jaw, compressing material against the fixed surface until the material fractures along its weak planes. This compression-based approach is uniquely well-suited to concrete and asphalt processing for several specific reasons:
Concrete with Embedded Rebar
Demolition concrete typically contains 4-8% rebar by mass. The compression action of jaw crushing breaks concrete around embedded rebar without wrapping the steel through moving parts. After reduction, the rebar separates from the concrete cleanly. Komplet jaw crushers from the K-JC 604 upward include integrated hydraulic magnetic belts that automatically lift recovered ferrous metal off the discharge conveyor; the K-JC 503 includes magnetic attachment as an option (included in base price). Recovered rebar typically sells as scrap metal at $100-$300+/ton, adding revenue while keeping crushed RCA output clean.
Asphalt with Surface Contamination
Recycled asphalt pavement (RAP) feed includes asphalt cement, aggregate, and surface contamination from years of road use. The jaw crusher’s wide feed opening accepts irregular pavement chunks; the compression action reduces the material without wrapping the asphalt cement around moving parts (a problem with high-speed crusher types). Output gradation suits hot-mix asphalt plant feedstock or base material reuse.
Mixed Demolition Feed
Demolition sites rarely produce uniform material. Concrete this hour, asphalt the next, brick after that, mixed C&D debris with variable composition throughout. Compact jaw crushers handle this multi-material flexibility because the compression-based reduction works across material types and the wide feed opening accepts irregular feed shapes.
Variable Feed Sizes
The jaw opening (19″ x 12″ on the K-JC 503; 27″ x 16″ on the K-JC 704 PLUS) accepts a wide range of feed sizes from large demolition pieces directly out of an excavator bucket. Pieces too large get pre-broken with an excavator-mounted hydraulic breaker before feeding; pieces within the jaw opening feed directly without further preparation.
K-JC 503: The Tight-Access Specialist
Komplet K-JC 503 Mini Jaw Crusher — Komplet’s smallest jaw crusher, engineered for tight-access work where larger machines can’t deploy.
Verified K-JC 503 Specs
- Throughput: Up to 34 US tph
- Jaw opening: 19″ x 12″
- Engine: 25 HP Tier 4 Final diesel
- Weight: Approximately 7,496 lb
- Working dimensions: 15′ x 5′ x 6’6″
- Transport dimensions: 9’8″ x 5′ x 7’2″
- Recommended max feed: 10″ minus
- Output range: 3/4″ to 3-1/4″ (hydraulically adjustable)
- Standard features: Ultrasonic feed sensor (auto-regulates feeder belt to prevent jams), self-propelled tracked mobility, wireless remote control, hydraulic jaw setting adjustment
- Optional: Magnetic attachment (included in base price), oversize scalper attachment
- Approximate base price: $108,695
Where the K-JC 503 Fits
The 5′ transport width fits where standard contractor crushers can’t go — urban demolition, residential renovation, indoor work, basement demolition, narrow industrial sites. For pavers, landscape supply yards, small demolition contractors, and general contractors processing up to ~5,000 tons annually of concrete and asphalt, the K-JC 503 delivers real on-site recycling economics at the smallest capital footprint in Komplet’s lineup. Excellent first crusher for contractors testing concrete recycling economics on real projects before scaling up.
K-JC 704 PLUS: The Best-Selling Workhorse
Komplet K-JC 704 PLUS Portable Jaw Crusher — Komplet’s best-selling crusher and the workhorse for typical contractor and aggregate operations.
Verified K-JC 704 PLUS Specs
- Throughput: Up to 90 US tph
- Jaw opening: 27″ x 16″
- Engine: 74 HP Tier 4 Final diesel
- Weight: Approximately 26,455 lb
- Recommended max feed: Approximately 22″
- Output range: Hydraulically adjustable from 3/4″ to 3-1/4″
- Standard features: Hydraulic magnetic belt for rebar separation, reverse jaw function, standard dust suppression, self-propelled tracked mobility, wireless remote control, single-toggle hydraulically adjustable jaw
- Approximate base price: $241,255
Where the K-JC 704 PLUS Fits
The K-JC 704 PLUS covers the operational sweet spot for typical contractor demolition operations, mid-size aggregate producers, RCA recyclers, asphalt recyclers, and growing quarry operations. Annual volumes of 30,000-100,000+ tons fit comfortably within capacity. The integrated hydraulic magnetic belt becomes essential at this throughput level — manual rebar removal at sustained 90 tph operation isn’t practical. The K-JC 704 PLUS pairs naturally with the Kompatto 5030 vibrating scalping screen for spec-size production.
Standard Features That Make Concrete and Asphalt Processing Work
All Komplet jaw crushers ship with features specifically engineered for the operational realities of demolition concrete and asphalt processing:
Hydraulic Magnetic Belt (K-JC 604+) / Magnetic Attachment (K-JC 503)
Automatically lifts ferrous metal off the discharge conveyor during crushing. Recovered rebar and embedded structural steel becomes scrap metal revenue while keeping crushed output clean. Without integrated magnetic separation, demolition concrete crushing requires extensive manual rebar removal — eliminating most of the schedule compression benefits of on-site recycling.
Reverse Jaw Function
All Komplet jaw crushers include reverse jaw function — clears uncrushable obstructions in seconds via wireless remote without requiring chamber entry. Construction-side feed routinely contains uncrushable items (oversized rebar bundles, embedded structural steel, foreign metal objects, occasional construction tools) that would jam other crusher types. The reverse jaw function turns potential downtime events into 30-second remote operations.
Standard Dust Suppression
All Komplet jaw crushers ship with standard water-spray dust suppression specifically engineered for OSHA crystalline silica compliance (PEL of 50 ug/m3 over 8 hours). Concrete crushing generates significant crystalline silica dust; standard dust suppression supports compliance without aftermarket retrofits. Critical for operations bidding commercial work in jurisdictions with active OSHA enforcement.
Wireless Remote Control
All Komplet jaw crushers include wireless remote control — operator handles deployment, operation, jaw setting adjustment, conveyor positioning, and reverse jaw function from a safe position. Critical for safety (operator stays clear of the crushing chamber) and productivity (single operator handles full operation rather than coordinating multiple crew members).
Hydraulic Jaw Setting Adjustment
Output size adjustment from the wireless remote without manual tooling. Operations switch between coarse output for base aggregate and finer output for premium spec aggregate in seconds. Hydraulic adjustment supports flexible production matching different customer requirements without setup downtime.
Self-Propelled Tracked Mobility
All Komplet jaw crushers feature self-propelled tracked mobility with hydraulically folding conveyors. Deployment in 15-30 minutes from arrival to operating production. Same-day deployment is the operational baseline for project work — equipment requiring multi-hour setup or specialized assembly crews doesn’t fit project-based construction economics.
Tier 4 Final Emissions Compliance
All current Komplet jaw crushers use Tier 4 Final emissions-compliant diesel engines — required for federal compliance on construction equipment manufactured after 2014/2015 in the US. Tier 4 Final compliance is necessary for operating in many state-level emissions-restricted markets.
Ultrasonic Feed Sensor (K-JC 503 Standard)
The K-JC 503 includes a standard ultrasonic feed sensor that automatically regulates feeder belt speed based on chamber load — preventing overfeeding that would cause jams and underfeeding that would reduce throughput.
Komplet’s In-Person Demonstration Program
Komplet America operates an active demonstration program at our headquarters in Hillsborough, NJ. The program lets prospective buyers, dealers, and operators see compact mobile crushing and screening equipment in operation on real construction materials before making purchase decisions.
Materials Available for Demonstration
On-site materials include concrete, asphalt, bedrock, brick, and demolition waste. Visitors can see equipment processing the actual material types they would feed in their own operations.
Who Should Visit
- Demolition contractors evaluating on-site crushing for the first time
- Concrete and asphalt recyclers comparing equipment options
- Excavation contractors considering rock recovery from project material
- Aggregate producers evaluating compact mobile alternatives to fixed installations
- Landscape supply yards entering RCA or aggregate production
- Paving companies evaluating on-site asphalt recycling
- Rental fleet operators evaluating Komplet equipment for their rental inventory
- Dealers interested in carrying the Komplet line
Schedule a Demo
Demonstrations are scheduled by appointment. Contact Komplet America or call 908-369-3340 to schedule a visit. Demonstrations typically include equipment operation, technical Q&A with the Komplet America team, and discussion of how the equipment fits the visitor’s specific operational profile.
Frequently Asked Questions
Which Komplet small jaw crusher is best for concrete demolition?
For tight-access urban demolition or small-scale operations (under ~5,000 tons annually), the K-JC 503 — up to 34 US tph, 19″ x 12″ jaw, 5′ transport width. For typical contractor demolition operations (5,000-100,000+ tons annually), the K-JC 704 PLUS — up to 90 US tph, 27″ x 16″ jaw, Komplet’s best-selling crusher.
Can a small jaw crusher handle reinforced concrete with rebar?
Yes. Komplet jaw crushers from K-JC 604 upward include integrated hydraulic magnetic belts that automatically separate rebar from crushed output during crushing. The K-JC 503 includes magnetic attachment as an option (included in base price). The compression action of jaw crushing breaks concrete around embedded rebar without wrapping the steel through moving parts. Recovered rebar typically sells as scrap metal at $100-$300+/ton — adding revenue while keeping crushed RCA output clean.
Can a small jaw crusher handle asphalt?
Yes. The compression action handles asphalt without wrapping the asphalt cement around moving parts. Output gradation suits hot-mix asphalt plant feedstock (RAP) or base material reuse. Some operations process asphalt at slightly cooler ambient temperatures to reduce material stickiness; the equipment handles asphalt in typical operating conditions across most of the year.
How long does it take to set up a small jaw crusher at a new site?
Under 30 minutes for both the K-JC 503 and K-JC 704 PLUS. Self-propelled tracked, hydraulically folding conveyors, wireless remote control. One operator drives the machine into position, deploys conveyors, runs a brief warm-up, and starts feeding. Same-day deployment is the operational baseline.
Can I rent a small Komplet jaw crusher before buying?
Yes — through Komplet’s authorized dealer and rental network. Find your local Komplet dealer or call 908-369-3340. Many partners offer rent-to-own arrangements where rental payments credit toward eventual purchase. Renting is typically the right starting point for first-time buyers — it demonstrates equipment fit on real projects before committing capital.
Does Komplet offer financing?
Komplet Capital offers 24-hour approval, 100% financing (no down payment for qualified buyers), 3-6 year terms. Bad credit is not automatically disqualifying. APR ranges typically 7.50% (excellent credit, 5+ years in business) up to 18% (higher-risk credit profiles). New equipment qualifies for Section 179 tax deduction up to $1.22M (2024 limit).
Can I visit Komplet America to see the equipment before buying?
Yes — Komplet America operates an active demonstration program at our headquarters in Hillsborough, NJ. On-site materials include concrete, asphalt, bedrock, brick, and demolition waste, so visitors can see equipment processing the actual material types they would feed in their own operations. Contact Komplet America or call 908-369-3340 to schedule a demonstration.
What’s the warranty on Komplet small jaw crushers?
All new Komplet equipment ships with a 1-year / 1,000-hour warranty (whichever comes first). Komplet America’s parts inventory is forecasted 12 months in advance, supporting fast wear-part availability when service items are needed. Authorized dealers across North and Central America provide local service support — call 908-369-3340 for parts, service, or technical questions.
Final Thoughts
Small compact jaw crushers like Komplet America’s K-JC 503 and K-JC 704 PLUS deliver real on-site concrete and asphalt processing economics for typical contractor and aggregate operations. The compression-based reduction handles reinforced concrete, asphalt with surface contamination, and mixed demolition feed reliably; the standard productivity features (magnetic separation, reverse jaw, dust suppression, wireless remote, tracked mobility) make these benefits achievable in real construction-side conditions; the demonstration program at Hillsborough, NJ supports buyers evaluating equipment before commitment. For demolition contractors, concrete and asphalt recyclers, paving companies, excavation contractors, and growing aggregate operations, on-site processing with compact jaw crushers typically delivers operational economics that the haul-out alternative can’t match.
Browse the complete Komplet jaw crusher lineup — K-JC 503, K-JC 604, K-JC 704 PLUS, K-JC 805 — for full specs, or call us to discuss which model fits your specific concrete and asphalt processing operation.
Ready to Talk Concrete and Asphalt Processing?
- 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 process concrete and asphalt debris on-site economically.
Disclaimer: All cost, ROI, payback, pricing, 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, scrap metal pricing, fuel costs, and labor 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.
