Trowel Finish Air Entrained Concrete

Beware of troweling air-entrained concrete floors

Before requiring air-entrained con-crete for interior slabs with a ma-chine-troweled finish, designers should assess: n The risk of concrete scaling due to cold-weather exposure n The cost of air-entrained concrete vs non-air-entrained concrete n The cost of repairing scaling or other freeze-thaw damage n The risk of delaminations when

Finishing Air-Entrained Concrete - cementorg

Other uses of air-entrained concrete include sulfate resistance, resistance to alkali-silica reactivity, and improved workability Hard troweling is a process by which a finisher uses a steel trowel to densify the surface of the concrete

Hard Trowel Finish on Air-entrained Concrete - ASCC

“Guide for Concrete Floor and Slab Construction,” states that entrained air is not recommended for concrete to be given a smooth, dense, hard-troweled finish ASCC concrete contractors will hard-trowel air-entrained concrete if required by specification, but only with the …

Air entrained concrete requires a light trowel touch

This blog post focuses on air entrainment for concrete, which can jeopardize the result of strong concrete with a hard, smooth, dense surface Air entrained concrete requires a light trowel touch to be given a smooth, dense, hard-troweled finish because blistering or delamination may occur These troublesome finishing problems can

Steel Troweling Exterior Air-Entrained Concrete| Concrete

Because of the danger of scaling or blistering, troweling of air-entrained exterior flatwork is not recommended Don't hard trowel air-entrained concrete surfaces that will be exposed to freezing and thawing, deicing agents or both

Delamination of Troweled Concrete Surfaces — What, Why

Do not use air-entrained concrete for interior slabs that will receive a trowel finish Avoid placing concrete on substrate with a temperature of less than 40°F (4°C) References Guide for Concrete Floor and Slab Construction, ACI 302 1R American Concrete Institute, Farmington Hills, MI concreteorg

Air Entrained Concrete and Trowel Finishing - Structural

Air Entrained Concrete and Trowel Finishing Air Entrained Concrete and Trowel Finishing pbc825 (Structural) (OP) 4 Dec 14 20:13 I'm getting into training for slab on grade design, and I had a question for my instructor that he wasn't able to answer

CIP 20 - Delamination of Troweled Concrete Surfaces

4 Avoid placing concrete directly on vapor retarders, if the application allows 5 Do not use air-entrained concrete for interior slabs that will receive a trowel finish 6 Avoid placing concrete on substrate with a temperature of less than 40° F (4° C) References 1 Guide for Concrete Floor and Slab Construction, ACI 3021R

Finishing Interior Concrete Floors - For Construction Pros

Always review and check the specifications, proposed mix designs and delivery tickets for air-entraining admixtures so you do not unknowingly power trowel air-entrained, normal-weight concrete

Use the Right Finishing Too! at the Right Time

the final finish for air-entrained con­ crete whenever possible If the own­ er requests a steel-trowel finish for air-entrained concrete, start trowel­ ing only after bleeding has stopped Using Jointers or Groovers With Sliort Bits Jointers are used to cut contrac­ tion joints in fresh concrete To ef­ fectively control random cracking,

Finishing air entrained concrete - Structural engineering

The concrete requires a steel trowel finish according to the membrane manufacturers CSA Standard S413 says that a "single pass" of the steel trowl is ok on the air entrained concrete I know that a higly bernished finish on air entrained concrete is problematic, but is a single pass of the steel trowel on air entrained concrete a problem?

Technical Bulletin Machine Trowel Finishing & Air

trowel finish room, hand float, machine float, imprinted and exposed aggregate finishes have all been found to be durable with air-entrained concrete in saturated freeze-thaw conditions For interior concrete floors where a smooth machine trowel finish is desired, air entrain-ment must not be used or delaminations will occur All surfaces to

How to Finish Concrete | The Family Handyman

Also, if you order air-entrained concrete delivered, don’t trowel the surface Broom finish for better footing Photo 8: Create a non-slip surface Drag a broom across the concrete after floating it with the magnesium float to create a non-slip surface Adjust the downward pressure to create the …

Troweling Air-Entrained Concrete | JLC Online | Concrete

When troweling air-entrained concrete, the contractor should do the following: Delay each finishing step as long as possible Keep the surface as “open” as feasible tand finally close the surface as late as possible When lightly troweling the surface at the end of finishing, “leave some fuzz on the surface,” as the finishers say 2

Beware of troweling air-entrained concrete floors

Delamination can occur by a variety of reasons, such as: (a) the use of air entrainment in a concrete slab receiving a hard trowel finish; (b) machine-trowel finishing a lightweight aggregate

Specco Industries - EZ Trowel RTU

EZ Trowel can be used effectively on both air entrained and non-air entrained concrete flatwork, and concrete mixes containing silica fume, fly ash, and latex modified concrete, concrete toppings or hardeners, stamped decorative concrete, as well as on stucco or plaster

Use the Right Finishing Too! at the Right Time

the final finish for air-entrained con­ crete whenever possible If the own­ er requests a steel-trowel finish for air-entrained concrete, start trowel­ ing only after bleeding has stopped Using Jointers or Groovers With Sliort Bits Jointers are used to cut contrac­ tion joints in fresh concrete To ef­ fectively control random cracking,

Avoid Surface Defects on Exterior Slabs

Avoid Surface Defects on Exterior Slabs using steel trowels or fresnos to finish air-entrained concrete A fresno is a long-handled trowel with a 5-in-wide and 24- to 48-in-long blade that

CIP 14 - Finishing Concrete Flatwork

6 TROWEL the concrete when required for its end use For sidewalks, patios , driveways and other exterior ap-plications, troweling is not usually required Air entrained concrete should not be troweled If trowel finishing of air-entrained concrete is required by specifications, ex-treme caution should be exercised when timing the fin-ishing

Concrete Finishing Tools - Trowels, Floats, Edgers, and

For example, he notes that you're likely to need different tools for finishing exterior concrete that's air entrained because the high air content can make the concrete sticky Harris finds that a magnesium bull float works best because it won't stick to the concrete

CIP 14 - Finishing Concrete Flatwork - Civil Engineering

Air entrained concrete should not be troweled If trowel finishing of air-entrained concrete is required by specifications, extreme caution should be exercised when timing the finishing operation For a smooth floor make successive passes with a smaller steel trowel and increased pressure Repeated passes with a steel trowel will produce a

Troweling Air-Entrained Concrete Floors Tcm45-343501 P2

Before requiring air-entrained concrete for interior slabs with a machine-troweled finish, designers should assess: The risk of concrete scaling due to cold-weather exposure The cost of air-entrained concrete vs non-air-entrained concrete The cost of repairing scaling or other freeze-thaw damage The risk of delaminations when air-entrained

CSA A231-2014 | Concrete Floor Contractors Association of

A machine trowel finish shall not be used on air entrained concrete to avoid the potential for surface delaminations Concrete mixes for floors should have a MINIMUM slump of 100 mm at the point of placement General use cement may be modified with up to …

How to Finish Concrete: 15 Steps (with Pictures) - wikiHow

Jan 23, 2019 · Consider a trowel finish Troweling too deep or troweling "air-entrained" concrete mixes can release the concrete's air bubbles and prevent it from setting correctly "It answered my questions about how to finish concrete" DS Donald Sanders …

(PDF) Delamination: The sometime curse of entrained air

In new construction, power trowels are frequently used for large concrete pour areas, including parking deck slabs containing entrained air, to compact/consolidate the surface and expedite finishing

Finishing Flatwork — What, Why, & How? – Nevada Ready Mix

Air entrained concrete should not be troweled If trowel finishing of air-entrained concrete is required by specifications, extreme caution should be exercised when timing the finishing operation For a smooth floor make successive passes with a smaller steel trowel and increased pressure

Troweling Air-Entrained Concrete Floors Tcm45-343501 P2

Before requiring air-entrained concrete for interior slabs with a machine-troweled finish, designers should assess: The risk of concrete scaling due to cold-weather exposure The cost of air-entrained concrete vs non-air-entrained concrete The cost of repairing scaling or other freeze-thaw damage The risk of delaminations when air-entrained

Damages to Concrete Caused by Winter - Part II by Sealant

Damages to Concrete Caused by Winter – Part II I should really say that nearly all major organizations in the industry strongly discourage trowel-finishing any air-entrained concrete ACI (American Concrete Institute), PCA (Portland Cement Association), NRMCA (National Ready-Mix Concrete Association) all discourage trowel-finishing any

steel trowel concrete finish - maurizioprestigeit

Do not use air-entrained concrete for interior slabs that will receive a trowel finish 6 Avoid placing concrete on substrate with a temperature of less than 40° F (4° C)

How to Hand Trowel a Smooth Finish on Concrete

Softener & Air Filtration Systems; Wells, Sump Pumps, Septic Systems; How to Hand Trowel a Smooth Finish on Concrete What You'll Need However it must be kept in mind that hand trowels can be used to finish concrete only if the area is not too large and can be conveniently handled Paths, patios, counter tops, and the like can easily be

Delamination of Trowel-Finished Lightweight Concrete Slabs

The variables considered included the substrate (vapor retarder or metal deck), finishing machine (walk-behind or ride-on), type of coarse aggregate (lightweight or normalweight), amount of entrained air, and type of cementitious material

Concrete Construction - cementorg

Finishing Air-Entrained Concrete Hard troweling is a process by which a finisher uses a steel trowel to densify the surface of the concrete This finish is optional and produces a hard, smooth surface Hard troweling is not recommended for air-entrained concrete for several reasons

A Burning Question: To Burnish or Not to - Concrete Decor

For a burnished finish — “The right terminology is a hard-steel-trowel burnished finish” — first strike the surface with a straightedge to make sure it’s fairly level, pass with a bull float and, when the concrete is ready, come in with a machine and hit it once or twice with shoes or pans to flatten it, says Bouknight

How to Finish Concrete: 15 Steps (with Pictures) - wikiHow

Jan 23, 2019 · Consider a trowel finish Troweling too deep or troweling "air-entrained" concrete mixes can release the concrete's air bubbles and prevent it from setting correctly "It answered my questions about how to finish concrete" DS Donald Sanders …

Finishing Lightweight Concrete Floors - ESCSI

reported on both normalweight and lightweight concrete floors when a riding trowel with float pans has been used Concrete Finishing adapt to the fact that lightweight concrete is always air entrained at about 6%, and often has a different timing sequence during finishing

14 Common Concrete Questions - Rental Equipment Register

Dec 01, 2004 · A: Power trowels are not used for exterior slabs because a different type of concrete is generally used Because of the drastic changes in temperature an exterior slab must withstand, air is entrained into the concrete When a power trowel is used to finish air-entrained concrete, flaking generally occurs

Concrete Delamination - Causes and How To Avoid

Do take precautions when finishing if the concrete is air entrained At air contents greater than 3%, a dense, hard-troweled surface isn't necessary There is less potential for delamination if you give the surface a light steel-troweled finish or a broom finish in exterior areas where slip resistance is a concern

Delamination - A State-of-the-art Review

(1) Air Entrainment - Incorporation of entrained air in an indoor concrete slab receiving a dense, hard, machine-troweled finish is known to be a common cause for delamination The higher the air content, and/or the higher (and longer) the finishing pressures, the