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AMCO Concrete

Concrete Construction Guide

Use this guide to understand how concrete projects are planned, specified, prepared, placed, finished, cured and maintained. It covers AMCO Concrete’s three core project paths: new concrete, concrete replacement and custom concrete projects.

Planning reference: The values below are industry planning ranges—not project-specific engineering criteria. Concrete thickness, reinforcement, joints, subgrade preparation, drainage, compressive strength and allowable loads must be selected for the actual site, intended use, governing code and approved plans. Structural or unusually loaded work may require a licensed design professional.

Performance Basics

Concrete strength is only one part of slab performance.

Concrete is commonly specified by f’c, the required compressive strength at a stated age—often 28 days. A 4,000 psi mix is not the same thing as a “4,000 psi load rating.” Vehicle and equipment capacity depend on slab thickness, support conditions, wheel or axle loading, joint layout, reinforcement strategy, concrete strength and edge conditions.

Planning parameter What it tells you Common planning reference
Compressive strength, f’c Resistance of hardened concrete to compression; verified with cylinders under ASTM C39. About 3,000–4,000 psi is common for many nonstructural flatwork applications; 4,000–5,000+ psi may be specified for higher durability or loading demands. Plans/specifications govern.
Flexural strength / modulus of rupture Resistance to bending; important in pavement/slab design. Measured by beam tests such as ASTM C78. It should not be guessed solely from compressive strength when it is a design criterion.
Slump Workability/consistency of fresh concrete, measured by ASTM C143. Specified to suit placement method and mix design. Higher slump does not automatically mean more water because water-reducing admixtures can increase workability.
w/cm Water-to-cementitious-material ratio. Lower ratios generally improve strength and permeability when the mixture can still be placed and consolidated correctly. The approved mix design controls.
Curing Maintaining moisture and temperature so hydration can continue. NRMCA notes external curing commonly continues about 3–7 days; project specifications may require longer. 28 days is a standard strength-test benchmark, not the day concrete suddenly becomes “finished.”

Service Guides

Choose the type of project you are planning.

Materials

What is actually in concrete?

Cementitious binder

Portland cement or portland-limestone cement provides the primary hydraulic binder. Supplementary cementitious materials (SCMs), such as fly ash, slag cement or silica fume, may be used to modify strength development, permeability, heat generation, workability or sustainability characteristics.

Aggregates

Fine and coarse aggregates make up most of concrete’s volume. Gradation, maximum aggregate size, cleanliness, hardness and moisture condition affect workability, finishability, shrinkage and performance.

Water & admixtures

Water initiates hydration. Chemical admixtures can control set, improve workability, reduce water demand, entrain air or address hot-weather placement. Jobsite water additions should follow the approved mixture and supplier procedures rather than being used casually to make a mix easier to place.

Reinforcement & fibers

Reinforcing bars, welded-wire reinforcement, dowels and fibers serve different purposes. Reinforcement can control crack width, transfer load or provide structural capacity, but it does not eliminate the need for proper joints, support and curing.

Finishes

Finish selection affects appearance, traction and wear.

Finish Typical characteristics Planning considerations
Broom finish Textured, slip-conscious surface often used outdoors. Broom timing, direction and texture depth influence appearance and traction.
Trowel finish Dense, smoother surface commonly associated with interior or protected slabs. Over-finishing or finishing while bleed water is present can contribute to surface defects; exterior slip resistance must be considered.
Exposed aggregate Decorative aggregate is revealed at the surface. Aggregate source, exposure depth, timing, wash technique and sealer compatibility affect consistency.
Integral color / color hardener Decorative color throughout the mix or concentrated at the wearing surface. Batch consistency, water control, curing method and mockups matter because concrete color naturally varies.
Stamped / textured Patterned decorative surface. Requires coordinated coloring, release materials, stamping timing, joint layout and later sealing/maintenance.

Loads & Wear Resistance

There is no universal “psi-to-vehicle-weight” conversion.

For slabs-on-ground, performance is a system: concrete flexural capacity, thickness, subgrade/subbase support, reinforcement or load-transfer details, joints, edge support and wheel loads all interact. ACI 360R addresses slab-on-ground design, and pavement design commonly uses flexural strength plus traffic and support conditions.

Use category Common planning thickness Load planning note
Pedestrian walks / patios About 4 in. is commonly used where site and local requirements allow. Primarily foot traffic; drainage, settlement control and jointing remain important.
Passenger-vehicle driveway About 4 in. is common on competent, well-prepared support. Edge thickening, soft subgrade, poor drainage or heavier vehicles can justify a different design.
Pickups / light service vehicles 5–6 in. is often considered as loads increase. Actual wheel loads, turning, parking duration and soil support should be reviewed.
RVs, delivery trucks, commercial traffic or concentrated loads Project-specific; 6 in. or more may be needed, but thickness alone is not a design. Use an engineered or plan-based slab design when loading is significant, repetitive, concentrated or structurally consequential.
Wear resistance: ASTM C944 and C779 are standardized abrasion tests used to compare concrete surfaces. They report measured wear or material loss under a defined test—not a universal consumer “wear rating.” Lower measured loss under the same test indicates better relative abrasion resistance. Strong wear performance generally depends on appropriate mixture proportioning, low unnecessary water content, sound aggregate, correct finishing and effective curing. Heavy industrial abrasion may call for a specifically designed wearing surface or hardener.

Typical Sequence

What happens before and after placement.

  1. Scope & site reviewUse, dimensions, access, drainage, existing conditions, permits/plans and finish expectations.
  2. Layout & preparationExcavation, subgrade correction, base placement/compaction, forms, reinforcement, embeds and pre-pour checks.
  3. Concrete sourcing & deliveryApproved mix, quantity, truck access, pump/conveyor needs, weather plan and placement sequence.
  4. Placement & finishingDeposit, consolidate, strike off, float, finish and establish joints at the planned time.
  5. Curing & protectionBegin curing promptly after finishing conditions allow; protect from early drying, impact and premature traffic.
  6. Opening to useFoot traffic may be allowed before vehicle traffic. Vehicle or heavy-load access should follow project-specific strength, curing and contractor/design guidance.

Maintenance

Protect the surface and the joints.

  • Keep joints and drainage paths clear so water does not pond against slab edges.
  • Clean spills before oils, rust-producing materials or chemicals remain on the surface for long periods.
  • Avoid deicing chemicals unless the concrete and sealer system are appropriate for that exposure.
  • Inspect cracks, settlement and joint sealants periodically; movement that changes drainage or creates a trip hazard deserves evaluation.
  • Decorative sealers are maintenance coatings—not permanent finishes. Recoat intervals depend on traffic, UV exposure, chemistry and product type.
  • Do not assume a surface sealer will correct weak concrete, poor drainage, unstable subgrade or structural overloading.

Concrete Terminology

Terms you will hear during project planning.

f’cSpecified compressive strength of concrete.
w/cmWater-to-cementitious-material ratio.
SCMSupplementary cementitious material.
SlumpField measure of fresh-concrete consistency/workability.
SubgradePrepared native or engineered soil supporting the slab system.
Subbase/BasePlaced granular layer used to improve support, drainage or constructability.
Proof rollField evaluation intended to identify unstable or yielding support.
Contraction jointPlanned weakened plane that encourages shrinkage cracking at a selected location.
Isolation jointSeparation that allows differential movement between concrete and another element.
Construction jointInterface where one placement stops and a later placement begins.
DowelSmooth steel bar used to transfer load while permitting joint movement when detailed that way.
RebarDeformed reinforcing steel used where design or crack-control strategy requires it.
Strikeoff / screedInitial leveling of freshly placed concrete to line and grade.
Bull floatTool used after strikeoff to smooth and embed aggregate near the surface.
Bleed waterWater that migrates toward the surface after placement.
CuringMoisture/temperature management that supports hydration and property development.

Industry References

Standards behind the terminology.

This guide is written for owner education and project planning. Common industry references include ACI CODE-318-25 for structural concrete, ACI 302.1R-15 for floors/slabs, ACI 360R for slabs-on-ground, ACI PRC-305-20 for hot-weather concreting, ACI PRC-308-26 for curing, NRMCA Concrete in Practice guidance, and ASTM methods including C39, C78, C143, C779/C944 and C94/C94M.

American Concrete Institute · NRMCA Concrete in Practice · ASTM Concrete Standards

Turn the guide into a project plan.

Tell AMCO the location, approximate dimensions, intended use, expected traffic and finish you want. Call (760) 216-7943 or request an estimate.

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