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Slag Cement Frequently Asked Questions
This section contains answers to frequently asked questions (FAQ) about slag cement, and links to the Slag Cement in Concrete (SCIC) information sheet series that provides more detail.  If you have questions that are not answered here, email SCA at info@slagcement.org, or call 281-340-8550.
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Does slag cement change the color of hardened concrete? 
[Cementitious Materials (powder)]Slag cement is a white-colored hydraulic cement that will lighten the color of fully hardened, cured concrete.  The lighter color of slag cement concrete (compared with concrete made with other cementitous materials - see photo) is generally considered to be a positive benefit, as it not only improves the aesthetic   more...
Why does slag cement concrete sometimes temporarily turn green? 
Slag cement concrete sometimes turns green for a short period of time due to the oxidation state of sulfide sulphur compounds during portland/slag cement hydration.  This is normally a temporary condition and the concrete, upon exposure to air and sunlight, will ultimately become lighter than 100% portland cement concrete.  The condition is   more...
How does slag cement affect permeability and corrosion resistance? 
Low concrete permeability is essential for long-term durability, especially with regard to corrosion resistance of reinforcing steel.    The additional CSH formed and denser cement paste in slag cement concrete reduce pore size and lower concrete permeability, often by several orders of magnitude.    Low permeability reduces the ingress of harmful   more...
How does slag cement affect concrete strength and elastic modulus? 
Slag cement provides higher levels of compressive strength in concrete when compared with ordinary portland cement (OPC) concrete of equal cementitious materials content.     Slag cement proportions of 40 to 50% normally optimize strength.    Concretes made with slag cement will generally exhibit higher flexural strength for a given level of   more...
Does slag cement help reduce heat and cracking in mass concrete? 
Mass concrete applications require limitations on the temperature differential between the surface and center of concrete to guard against thermal cracking.    Slag cement reduces the rate of heat rise in proportion to its quantity in a mixture.    Generally, high replacement rates are required (50 to 80%) to meet low heat of hydration requirements   more...
Does slag cement help mitigate alkali-silica reaction? 
ASR occurs when the alkalis in portland cement react with certain reactive aggregates to form an expansive gel that causes the concrete to crack, swell and prematurely deteriorate. Slag cement mitigates ASR by reacting with the alkalis in portland cement and making them unavailable for reaction.    It also lowers the permeability of the concrete,   more...
Does slag cement help mitigate sulfate attack? 
Sulfate attack occurs when sulfates, found in seawater and some soils, react with the tricalcium aluminate in portland cement.    This causes an expansive reaction and resulting deterioration of the concrete structure.    Slag cement helps in two ways: 1) reduced permeability reduces the ingress of deleterious sulfates into the concrete and 2) slag   more...
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