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Field-cured test cylinders should be cured in the same manner as the concrete they represent. The temperature-time history of the test cylinders should match the in-place concrete curing conditions. In this case, the field-cured test cylinders overestimated the in-place concrete strength because they were sitting adjacent to a jobsite heater..
How to Estimate In-place Strength of Concrete
Tips for Cold Weather Concreting
Avoid honeycombing by using appropriate concrete mixtures with sufficient workability, proper placement and consolidation techniques.
Tips to Minimize Concrete Consolidation Issues with Forming Projects
Matching the size of the vibrator to the job and limiting the insertion spacing to one and a half times the radius of influence will minimize honeycombing and other form surface blemishes.
How to Use an Internal Vibrator
Restraightening will cut down high spots and fill low spots; it can increase FF numbers from about 30 to 50 percent.
How to Finish Flatter Concrete Floors
Finishers should edge along the edge form so contraction joints are easily visible for accurate sawcutting.
How to Hand-Trowel Edges and Joints to Match Power Trowel Finishes
Scaling, above, and premature surface wear typically occur when contractors mix bleedwater into the surface or trap bleedwater and air directly beneath the surface.
Avoid Surface Defects on Exterior Slabs
Rubbed finishes (free of bugholes) consist of either smooth-rubbed, grout-cleaned rubbed or cork-floated finishes. Here a worker is producing a grout-cleaned finish free of bugholes by rubbing a grout into the surface voids.
New Surface Finishes for As-Cast Formed Concrete
Concrete placement technique directly affects placement rate. Placing concrete with a crane and bucket, as shown in the photo above, is a slower process than placing concrete with a pump or conveyor.
Avoid Too Much Pressure When Placing Concrete
This out-of-joint floor crack was caused by excessive concrete shrinkage and joint spacing. Because of the wide crack width and curling, load transfer across this crack through aggregate interlock has been lost.
Minimize Shrinkage, Minimize Cracking
Contraction joints and placement of reinforcement in concrete floors with radiant heating.
Contraction Joints for Radiant-Heated Floors
Think of a vapor retarder as though it were an imaginary 'bathtub' that should hold water if filled. Repair any tears and tape up areas around conduits and pipes.
How to Install Vapor Retarders
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