Cement Kiln Dust
What Is Cement Kiln Dust?
Cement Kiln Dust (CKD) is a fine-grained byproduct collected from the exhaust gases of cement manufacturing kilns. It consists primarily of calcium carbonate, calcium oxide (quickite), silicon dioxide, and various alkali compounds. CKD has cementitious and pozzolanic properties that make it valuable for a range of construction and industrial applications.
As a wholesale CKD supplier, Hasten Chemical sources material from cement plants across Texas and the Southeast, providing consistent quality product backed by laboratory analysis for every shipment.
CKD Applications
- Soil stabilization — CKD is widely used to stabilize expansive clay soils, soft subgrades, and wet site conditions. Its high calcium content provides rapid strength development, making it effective for time-sensitive construction projects where the subgrade must be ready for paving or foundation work quickly.
- Base course stabilization — Mixed with aggregate or native soil, CKD creates a stabilized base course for roads, parking lots, and industrial pads. The treated material develops compressive strength over time while remaining workable during placement.
- Waste solidification and stabilization — CKD’s alkaline properties make it effective for solidifying and stabilizing waste materials, including contaminated soils, industrial sludges, and wastewater treatment residuals.
- Agricultural lime substitute — The calcium carbonate content in CKD can be used as a soil amendment to raise pH in acidic agricultural soils, providing similar benefits to agricultural lime at a lower cost.
- Mine backfill — Mixed with water and aggregate, CKD creates a flowable fill material suitable for mine void backfilling and underground stabilization applications.
CKD vs. Fly Ash for Soil Stabilization
Both CKD and fly ash are effective soil stabilization agents, but they perform differently depending on the soil conditions and project requirements:
CKD advantages:
- Faster initial strength gain — CKD develops strength more quickly than Class F fly ash due to its higher free lime content
- More effective in wet conditions — CKD’s hygroscopic properties help dry wet soils faster, allowing compaction to proceed sooner
- Better performance in high-PI clays — CKD is often more effective than fly ash in soils with plasticity index above 35
Fly ash advantages:
- Higher long-term strength development through the pozzolanic reaction
- Better sulfate resistance in soils with high sulfate content
- More predictable and well-documented performance in ready-mix concrete applications
Our technical team can help you evaluate which material — or which combination — is best suited for your specific soil conditions and project requirements. We supply both products and can arrange comparative testing if needed.
Bulk Supply and Delivery
Hasten Chemical supplies CKD in bulk quantities via pneumatic tanker truck for construction and industrial projects across Texas and the surrounding region. Standard delivery options include:
- Bulk pneumatic tanker delivery — CKD is delivered by pneumatic tanker truck directly to your job site or silo. Standard loads run 22–25 tons per truck, with scheduling coordinated to match your construction timeline.
- Houston metro availability — For urgent orders within the greater Houston area, same-day or next-day delivery is typically available depending on inventory and scheduling.
- Statewide Texas coverage — Regular delivery routes across Texas, with service to Louisiana, Oklahoma, and nationwide projects by arrangement.
- Emergency and rush delivery — Expedited scheduling available for time-critical projects where standard lead times are not feasible.
Every shipment includes a certificate of analysis confirming chemical composition and physical properties. For large-volume contracts, we offer competitive term pricing with guaranteed supply and priority scheduling.
TxDOT Specs, Application Rates & FAQ
TxDOT Specifications for CKD
Cement kiln dust used on Texas Department of Transportation (TxDOT) projects is covered under several spec items:
- Item 265 — Fly Ash/CKD Treatment: CKD is explicitly recognized as a stabilizing material for base and subgrade treatment.
- Item 260 — Lime Treatment: CKD may substitute for lime when it meets equivalent cation exchange and pH requirements per lab testing.
- Item 275 — Cement Treatment: High-lime CKD may qualify as a supplementary cementitious material depending on kiln source chemistry.
Hasten Chemical provides certified lab analysis (SiO2, CaO, Al2O3, SO3, free lime, loss on ignition) with every shipment to support TxDOT submittals and mix design verification.
Frequently Asked Questions
What is the typical CKD application rate?
Typically 4% to 8% by dry weight of soil, depending on PI and moisture content. A geotechnical engineer should confirm based on Atterberg limits testing.
How does CKD compare to lime for high-PI clay soils?
CKD performs comparably to hydrated lime on high-PI soils (PI above 35) and typically achieves faster initial strength gain. CKD is often preferred due to lower cost and better local availability in Texas.
Can CKD be blended with fly ash?
Yes. CKD/fly ash blends combine rapid early strength (from CKD) with long-term pozzolanic gain (from fly ash). Hasten Chemical supplies both and can advise on blend ratios.
What documentation comes with each shipment?
Every delivery includes a certificate of analysis (COA), bill of lading, and source plant information for TxDOT submittals and project records.
Do you deliver outside Texas?
Yes. We source from cement plants across Texas and the Gulf Coast and deliver to Louisiana, Oklahoma, Arkansas, and New Mexico.
Request a Quote
Ready to discuss your project requirements? Our team provides competitive pricing, reliable delivery, and technical support for every order.
Or call 832-655-7763 | Email info@hastenchemical.com