ACT Grouts

Which ANSI standard establishes the minimum performance requirements for standard cement grout used in tile installations?

• AANSI A118.3
• BANSI A118.6
• CANSI A118.7
• DANSI A118.10F

ANSI A118.7 high-performance cement grouts most commonly use which type of cement binder?

• AOrdinary Portland cement
• BCalcium aluminate cement
• CType N masonry cement
• DSulfate-resistant Type V cement

Which ANSI grout standard would you specify for a commercial kitchen floor that must resist food acids and oils?

• AANSI A118.6
• BANSI A118.7
• CANSI A118.3
• DANSI A136.1

Which statement best describes ANSI A118.10F urethane reaction-resin grouts?

• APortland cement-based with dispersible polymer for added flexibility
• BSingle-component or two-part reaction-resin grouts that are flexible and stain-resistant…
• C100% solids epoxy mixed at the job site from three components
• DInorganic furan cements used in industrial chemical exposure

An organic, polymer-based, ready-to-use grout that ships in a pail with no field water mixing falls under which ANSI grout designation?

• AANSI A118.6 standard cement
• BANSI A118.19 organic premixed grout
• CANSI A118.16 underlayment
• DANSI A108.5 tile installation

Compared with ANSI A118.6 standard cement grout, A118.7 high-performance grout typically provides all of the following EXCEPT:

• AImproved stain resistance
• BBetter color consistency with reduced efflorescence
• CHigher abrasion resistance
• DLower cost per pound

Which characteristic is the strongest reason to specify epoxy (A118.3) grout over cement (A118.6 or A118.7) grout in a food-processing wash-down area?

• ALower material cost
• BFaster installation speed
• CNear-zero water absorption and chemical resistance
• DCompatibility with sanded joints over 3/8 inch

ANSI A118.6 standard cement grouts are MOST associated with which long-term aesthetic defect?

• AEfflorescence (white salt deposits at the surface)
• BYellowing under UV exposure
• CLoss of pigment from chlorine pool water
• DSurface gloss caused by polymer migration

A residential client wants the same grout color in their shower walls, shower floor, and adjacent bathroom floor. Which single grout type can serve all three locations without sealing later?

• AANSI A118.6 standard cement
• BANSI A118.7 high-performance cement
• CANSI A118.3 epoxy or A118.10F urethane
• DAny polymer-modified thinset

Which test method is referenced by ANSI A118.6 for measuring cement grout compressive strength?

• AASTM C109 (mortar cube compression)
• BASTM C39 (concrete cylinder compression)
• CASTM D790 (flexural beam)
• DASTM D2240 (Shore hardness)

An installer is choosing between A118.6 and A118.7 grout for a hospital corridor floor. Which factor most strongly favors A118.7?

• ALower material cost
• BImproved chemical and stain resistance with reduced efflorescence
• CCompatibility with joints under 1/16 inch
• DNeed for a topical sealer

Which statement about single-component (A118.19) premixed grouts is TRUE?

• AThey require the addition of field water and a 10-minute slake
• BThey are ready-to-use organic grouts and skin over once exposed to air
• CThey are 100% solids epoxies that must be used within 45 minutes
• DThey use the same Portland cement as A118.6 with no polymer

A specifier asks for a grout that can flex with minor substrate movement, resists stains, and does not require a sealer. Which grout class best meets all three needs?

• AA118.6 standard cement with penetrating sealer
• BA118.10F urethane reaction-resin grout
• CA118.4 modified thinset used as grout
• DPlain Portland cement mixed with sand

ANSI A118.3 epoxy grouts must be water-cleanable. What does 'water-cleanable' mean in this standard?

• AThe cured grout dissolves in water for easy removal
• BExcess uncured grout can be cleaned from the tile face with water before the epoxy sets
• CThe grout requires water to begin its chemical cure
• DThe grout can be rinsed off with water after one full day

Which property is generally LOWEST for ANSI A118.6 standard cement grout compared with A118.7, A118.3, and A118.10F?

• ACompressive strength
• BStain and chemical resistance
• CMaterial cost per pound
• DSusceptibility to efflorescence

Furan resin grout is occasionally specified in industrial settings. Which environment best justifies its use?

• AResidential shower walls
• BCommercial kitchen tile floors
• CBattery rooms and aggressive chemical-exposure industrial floors
• DExterior swimming pool decks

When grouting a polished marble wall with hairline joints of about 1/16 inch, which grout type is the correct choice?

• ASanded A118.6 standard cement
• BUnsanded A118.6 or A118.7 cement
• CSanded A118.3 epoxy
• DSanded urethane grout

TCNA guidance permits unsanded cement grout in joints up to what maximum width?

• A1/32 inch
• B1/16 inch
• C1/8 inch
• D3/16 inch

Sanded cement grout is appropriate for joints of what width?

• ALess than 1/16 inch
• B1/8 inch and wider
• COnly joints exceeding 3/4 inch
• DAny joint where the tile is glazed

TCNA's minimum recommended grout joint width for RECTIFIED tile is:

• A1/32 inch
• B1/16 inch
• C1/8 inch
• D1/4 inch

For CALIBRATED tile (manufactured with size variation but not edge-rectified), TCNA recommends a minimum grout joint of:

• A1/16 inch
• B1/8 inch
• C3/16 inch
• D3/8 inch

Which factor is the PRIMARY driver of selecting sanded vs unsanded cement grout?

• AThe color of the tile
• BThe width of the grout joint
• CThe thickness of the tile
• DThe brand of mortar already on the floor

An installer wants to grout a polished glass mosaic with 1/8-inch joints. Which grout choice minimizes the risk of scratching the glass faces?

• ASanded A118.6 cement grout
• BSanded A118.7 high-performance cement grout
• CUnsanded A118.6 or non-sanded epoxy/urethane
• DSanded epoxy grout with quartz aggregate

Which of the following is the BEST joint-width choice for a 24-inch by 48-inch rectified porcelain floor plank in a residential foyer?

• A1/32 inch (butt joint)
• B1/16 inch
• C1/8 inch minimum
• D1/2 inch

An installer is asked to grout calibrated terracotta tile with 1/4-inch joints. Which grout selection meets the application?

• AUnsanded cement grout
• BSanded A118.6 or A118.7 cement grout
• CEpoxy used as a thinset
• DCaulking compound

Why does TCNA prohibit a grout joint narrower than approximately 1/16 inch with cementitious grout?

• AIt violates fire codes
• BCement grout cannot reliably be packed into a joint that narrow, leaving voids
• CPenetrating sealers will not bond to narrow joints
• DTile manufacturers refuse to warranty narrow joints

A designer specifies 'invisible' grout joints with rectified large-format porcelain. Which is the correct installer response?

• AButt the tiles tight with no grout
• BUse a 1/32-inch joint and unsanded grout
• CHonor the TCNA minimum of 1/8 inch for rectified tile and discuss color-matched grout to…
• DUse epoxy thinset between the tiles to eliminate the joint

Which combination is appropriate for a 3/8-inch saltillo tile joint?

• AUnsanded cement grout
• BSanded cement grout (A118.6 or A118.7)
• CPure latex without aggregate
• DSingle-component A118.19 only

An installer mixes a 25 lb bag of sanded cement grout and the joint at 1/8 inch is showing pinholing after cleanup. The MOST likely cause is:

• AThe grout was sanded — sand caused the pinholes
• BToo much water was added during initial mixing or re-temper
• CThe tile was rectified
• DThe grout was over-sealed

A specifier asks for the narrowest TCNA-compliant joint for non-rectified ceramic wall tile in a kitchen backsplash. The correct minimum is approximately:

• A1/16 inch
• B1/8 inch
• C3/16 inch
• D1/4 inch

Two adjacent tiles in a calibrated batch measure 11-15/16" and 12-1/16". To absorb this variation across a 100 sq ft floor, the installer should:

• AMatch the joint to the narrowest gap available — 1/16 inch
• BUse a 3/16-inch minimum joint and gauge tiles before laying out
• CSort tiles to the same size and use a butt joint
• DCut all tiles to a uniform 11-15/16 inch

Which grout joint width / grout type combination is INCORRECT?

• A1/16 inch — unsanded cement
• B3/16 inch — sanded cement
• C1/2 inch — unsanded cement
• D1/4 inch — sanded epoxy formulated for wide joints

What is the manufacturer-recommended slake time for most ANSI A118.6 and A118.7 cement grouts after initial mixing?

• A30 seconds
• B5 to 10 minutes
• C30 to 45 minutes
• D2 hours

After the slake period, the grout in the bucket feels stiffer than at initial mix. The CORRECT next step is:

• AAdd a small amount of water to restore the original consistency
• BRemix by hand or with a slow drill WITHOUT adding water
• CThrow the batch away and start over
• DSpread the stiffer grout immediately without remix

An installer adds water to grout 20 minutes after the slake and remix, hoping to restore lost plasticity. What is the consequence?

• ANo effect — water is harmless
• BImproved bond strength because the polymer rehydrates
• CDiluted polymer binder, reduced strength, color variation, and pinholing
• DFaster cure as evaporation accelerates

The water-to-powder ratio for cement grout is BEST taken from:

• AWhatever the installer eyeballs as 'right'
• BThe manufacturer's printed mixing instructions on the bag
• CThe general thinset ratio
• DASTM C150 for hydraulic cement

Which ambient/mortar temperature range is recommended during grout mixing, application, and initial cure?

• A32-50°F (0-10°C)
• B50-100°F (10-38°C)
• C100-140°F (38-60°C)
• DTemperature does not matter

An installer mixes grout in a 90°F garage on a July afternoon. What practical adjustment helps maintain working time?

• AUse hot tap water to accelerate mix
• BUse cool (but not iced) potable water and mix smaller batches
• CSkip the slake to gain time
• DAdd liquid latex on top of the manufacturer water ratio

Which mixing tool is most appropriate for a 5-gallon bucket of cement grout?

• AA high-speed paint mixer above 1,000 RPM
• BA slow-speed drill (≤300 RPM) with a paddle, or hand mixing
• CA masonry hoe with no drill
• DA vibrating concrete float

Why does ANSI A118.3 epoxy grout typically have a much shorter on-the-job working time than A118.6 cement grout?

• AEpoxy cures by hydration, which is fast
• BEpoxy cures by exothermic chemical reaction between resin and hardener once mixed
• CEpoxy is sensitive to high humidity only
• DEpoxy cure time is unrelated to mixing

Which step is required when transitioning between two pails of the same color cement grout to avoid color variation?

• AMix the two batches together briefly in a clean third bucket before the first pail is emp…
• BAllow the first pail to run completely empty, then start the second fresh
• CAdd extra polymer to the second pail to match shade
• DUse only the second pail for the final cleanup pass

An installer accidentally pours a small extra amount of water into a 25 lb grout batch. The correct response is:

• AContinue mixing and use the batch as is
• BAdd more powder to restore the manufacturer ratio if possible, or discard the batch
• CAdd accelerator to compensate for the extra water
• DSpread immediately to evaporate the extra water

Which mixing practice is FORBIDDEN under ANSI installation methods and manufacturer instructions?

• AMixing two manufacturers' grouts together to produce a custom color
• BMixing a single bag of grout to the printed water ratio
• CLetting the grout slake for 5-10 minutes after initial mix
• DRemixing without adding water after slake

Which mixing-related variable has the LARGEST influence on cement grout working time?

• AColor of the grout powder
• BBrand of mixing paddle
• CCombined temperature of water, powder, and ambient air
• DType of mixing bucket

An installer reports the grout 'sets up' in the bucket before they finish a 25 sq ft area. Beyond temperature, the next most likely cause is:

• ASlake was extended to 30 minutes instead of 5-10
• BSlow drill speed during mixing
• CUsing a small batch in a large bucket
• DSlow application pace from an inexperienced installer

When spreading grout across the field of tile, the rubber float should be moved primarily:

• AAlong the joints in the direction of the grout lines
• BDIAGONALLY across the joints
• CIn tight circles only
• DVertically up and down the wall

Which type of float is correct for spreading cement grout onto a glazed ceramic tile floor?

• AHard rubber grout float
• BSteel pool trowel
• CNotched margin trowel
• DMagnesium concrete float