Why Do We Saw Equipment Types Matching Equipment to the Project Blade Selection Ensuring Construction Quality When Things Don t Go Right The Sawing Window Summary
Controlled Cracking Uncontrolled Cracking
Initial Saw Cut Reservoir Cut
Wet Saws Two Types Walk Behind Saws Rider Saws/Span Saw Dry Saws (Early Entry) Two Types Walk Behind Saws Rider Saws
Router
Dry Saws Cleans Seals
Production Requirements Project Location Construction Logistics and Traffic Control Requirements Available Work Windows Specific Project Requirements (ie dust control) Concrete Aggregate Type Concrete Mix Design
Courtesy: MultiQuip
Core Segment
Wet Blades 14 to 36 in Diameter 2500-3000 RPM based on diameter Down Cut: Keeps Saw Clean in Front by depositing slurry to rear With or W/O Gear box Requires Water for Cooling Dry Blades 6 to 14 in Diameter 3100 to 3500 RPM based on diameter and model Up Cut: Discharges Dust Forward and out of Cut Does Not Require Water- Uses Air Cooling Around Blade Requires Vacuum Dust Collection System
What Blade Diameter Can Be Accommodated on Saw What Arbor Size Is Required by Saw What is the Depth of Cut Required Saws Horsepower Affects Diamond Blade Selection Higher Horsepower Saws (i.e. >48 HP) require harder bond or higher diamond concentration More Production in cuts 3 inches or deeper Aggregate Type and Hardness and Concrete Mix Proportions Needed
Compressive Strength Hardness of the Aggregate Size of the Aggregate Type of Sand Green or Cured Concrete Abrasiveness of the Aggregate
Coarse Aggregate Type: ½ to 2 with ¾ Typical Fine grained hard agg (Mohs 6-9) require softer bonds that wear away faster because higher impact on diamonds Course grained soft agg require abrasive resistant bonds since diamond is subject to less impact Fine Aggregate Type: Sand abrasiveness in green concrete affects bond wear (blade life) the most. The more abrasive the shorter the life. Manufactured or crushed sands are the most abrasive.
Admixtures: Materials such as fly ash, which retards the set time, changes the window available to the sawing contractor They also affect the consistency of how well the slab sets up. The sawing contractor does not often know what admixtures were used were.
Begin Sawing 8 to 24 hours after the floating and finishing. Times frames are longer for cold weather. Cut transverse joints first-- most times (should be all of the time) prior to the longitudinal cuts Tracking / wheel alignment on walk behind saws (4 in 40 to the left) -
Unique Blade Up-Cutting Rotations Skid Plate Applying Pressure to the Surface Cut in the Green Zone - First Two Hours- Between Initial Set and Final Set Skid Plate Blade Early Entry Saw Blade Block
Tabs
TRUE EARLY ENTRY SYSTEM From:
CC190XL-EE Lifting Hook for Easy Transport Adjustable Handles For Operator Comfort 20.8HP Honda Engine Self-Propelled Drive Max Cutting Depth of 3 With 14 blade Can accept up to.500 wide blades Upcut Design
Skid Plates Stainless steel construction 1/8 thick bottom plate allows skid to be used for 2-3 blades before requiring replacement Steel mounting pins that won t break Mounted with a locking pin to keep the plate in place Fits both steel and cast skid plate saws ALWAYS CHECK SKID PLATE BEFORE SAWING! Look for wear at these highlighted areas on the skid plate. If the slot is not longer a straight line, you must replace the skid plate. This wear is typically seen every 2 to 3 blade lives depending on the aggregate type. Offered for blade thicknesses of.125,.250,.375 &.500
Pop Off Doweled Joint Mid Slab Diagonal
Joint Plow Sealant Removal Sawing
Ambient air temperature and humidity The type of base that the concrete is placed on Concrete thickness Direct sunlight or shade Blade selection Equipment Saw Cut Depth (T/4) or (T/3)
Selection of Appropriate Equipment for the Size and Expected Execution of the Construction Paving is Critical Ensure Safe and Efficient Work Zone Inspect the Work and Verify its Acceptability
Thank you
Concrete Hardness PSI Critically Hard 8,000 or more Hard 5,000 8,000 Medium 4,000 6,000 Soft 3,000 or less