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Cold Weather Concrete Mixes are like Making Cookies

Cold Weather Concrete Mixes are like Making Cookies

COLD WEATHER CONCRETE MIXES ARE LIKE MAKING COOKIES

For concrete to function in a cold climate a number of items are necessary. First is the need for the proper mix design. Water, cement and air must be used in the proper proportions to create durable concrete.

Consider this simile, your grandmother has been known for the delicious cookies she makes every Christmas. She follows her recipe to a T to achieve her desired results…that perfect melt-in-your-mouth cookie. Concrete, like your grandmother’s cookies, also requires the proper proportions of each ingredient to create the desired results. Too much water, the cookies will be flat, hard and brittle; too little water and egg, and the dough will be hard to work with.

Concrete has similar needs, and each part of the recipe must be followed to achieve the proper outcome.

So how do we know what the recipe calls for?  Well that depends on what we want in the final outcome.  For strength and durability, typically too much water will reduce those qualities.  If we have too little air entrainment, then the concrete will be brittle and flake.  If we have too much paste (flour) we will not be able to work our dough.

For each type of product used in the recipe for concrete, the most expensive part of the recipe is typically the cost of the cement.  The other products, air, water and aggregate, (the chocolate chips of our mix) are relatively inexpensive.  The recipe can be altered by changing or adding ingredients.  For example fly ash is used as a substitute to some percentage of the cement.  The fly ash is a product typically recycled from coal fired power generation plants.  There is plenty of discussions on that product, beyond this information  The civil or structural engineer will specify the mix recipe and the plant will provide the mix.  The contractor receives the plant mix, submits it to the engineer or architect for approval, and then has it delivered.  The time from the plant to the site is crucial, as is the waiting time if the contractor does not yet have the site ready for the placement of the concrete.  Similar to leaving the dough out too long before the cookie cutters make the stars, Santas and trees. Engineers would call that forming the dough.

If you are in a cold climate, the number of freeze thaw cycles must be understood, and the condition of the winter shadow lines as concrete will have many wet and frozen cycles that require higher durability.  The concrete mix then must be properly placed, and that placement, along with the working of the concrete, can have a good or bad impact on the final product.  Similar to the way Grandma worked the dough, reworked it, then flattened it to form (shape) her cookies.  Overworking the concrete mix will produce undesired results such as loss of the air or floating the fines to the top layer.  Those fines will not be bound in the mix, and the concrete will spall.

In some cases chemical admixtures can be used to provide strength, air entrainment, hydration speed, workability and other desired qualities such as density.  There is, as always, additional cost associated with these additions, yet the designer or contractor may need these, depending on the situation.

This link provides a mix design per ACI methods (not approved) from the http://concrete.union.edu/general.htm “ACI 211.1-91, Reapproved 2009, states: “The procedure for selection of mix proportions given below is applicable to normal weight concrete. Estimating the required batch weights for the concrete involves a sequence of logical straightforward steps. Some or all of the following specifications are required; maximum water-cement or water-cementitious material ratio, minimum cement content, air content, slump, maximum size of aggregate, strength, and admixtures.”

Hiring a consultant with a thorough understanding of concrete design and specification, as well as the ability to conduct quality assurance work will help you select the right mix for your application.

SBSA’s Solutions Before services are here to help you properly plan and execute your project. Our Solutions After services help provide you with concrete evaluations.

Written by Edward L. Fronapfel, PE and Jeff Felderman, PE.

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Premises Liability During The Winter Season

Premises Liability During The Winter Season

PREMISES LIABILITY DURING THE WINTER SEASON

Now that winter is underway, it is important that property owners and managers understand the unique nature of premises liability as it relates to slips, trips and falls in the winter season. While pedestrians navigating public walkways are encouraged to be cautious when confronted with a snowy or icy walkway, there are many things that the diligent property owner should be aware of how to help minimize the possibilities of someone getting hurt on their property. Building codes and local regulations require properties to be maintained to safeguard the health, safety, and welfare of the public. Exterior elements which fall under this category include sidewalks, ramps, exterior stairways and handrails/guardrails.

Dangerous Conditions Ahead! Ice buildup on a sidewalk where water from the downspouts discharge over the walkway and freezes.

Not only do property owners and managers need to be aware of common winter weather dangers, they also need to understand that with the holidays comes an increase in the number of visitors who are unfamiliar with the properties they are visiting.  That bump on the sidewalk that you walk across every day and know is there may not be known to an unfamiliar visitor, or even seen when the sidewalk is covered with snow or ice.

Watch your step! The landing slab is structurally supported by the foundation, and the sidewalk is supported on the backfill.  The different subbases result in different movement between the slabs.

Some things to consider when developing your Property Maintenance Plan:

  • Expecting an increase in visitors who are unfamiliar with your property during the holidays.
  • Trip hazards along the walkways, including heaving or settling of one of the sidewalk slabs, which could result in a fall.
  • Drainage paths where water flows over or adjacent to public walkways.
  • The shadows from adjacent buildings may cause ice buildup on certain areas of your walkways.
  • Handrail and guardrail conditions or existence in regards to steps, ramps or stairways.
  • Proper lighting of public walkways.

Hiring a consultant with a thorough understanding of hazard recognition and mitigation can be helpful to the diligent property owner in recognizing these risks and in safeguarding your property’s visitors. SBSA has been recognized as an expert by hundreds of property owners and managers and in many courts of law.

SBSA’s Solutions Before services are here to help you properly plan and execute your maintenance and repair plans. Our Solutions After services help you in case you are dealing with a potential claim if such a slip, trip or fall arises.

Written by Edward L. Fronapfel, PE and Michael Fiebig, AIA

Need an expert analysis for your insurance claim?

Submit an insurance claim form and SBSA will:

checkmark Review the claim
checkmark Determine and assess the damage
checkmark Examine potential causes of the damage
checkmark Provide repair solutions if necessary

License Coverage

SBSA holds licenses in 39 states throughout the US. Our experts handle all engineering and architectural aspects for our clients.

See where we’re working right now: