March 1968 Table of Contents

Problem Clinic Greenish-Blue Discoloration

We have noted the formation of a greenish/blue discoloration on some concrete. The occurrence of coloration was quite inconsistent, occurring sometimes after the first placement and not occurring again, while at other times it occurred first on the sevent Read more

Problem Clinic To Add or Not Add the Additive

We have been buying a portland cement additive that is supposed to densify and rapidly set concrete. We have been using it in lining large concrete water tanks and water tunnels. Now we find that this additive is a 20 percent solution of calcium chloride Read more

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