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Regarding chloride testing of existing concrete roads, both AASHTO and ASTM allow for an acid soluble chloride test or a water soluble chloride test. The acid test is alleged to give results that are 20% higher than the water test. Is either test more appropriate under particular conditions or...

The steel code has some specific language regarding connections that you may want to read too.

Getting away from a standard structural steel connection is risky. The A325 bolt capacities listed in the codes presume matching nuts of A563 and washers ASTM F438 unless specially designed fasteners are provided. There are considerations for faying surfaces, too. Bolting to a steel plate and...

Consider having a lab do a Windsor test to establish compressive strength of the mortar. You may find the mortar to be a limestone and sand mix of very low compressive strength. Once you know a bit more about the compressive strength, you may be able to extrapolate, either from the local code...

rjeffery & jheidt - Thanks for the input. In way of feedback, we are staying with the heat and increasing the strength by at least 500 psi. Concrete is being covered with visqueen for 2-3 days, weather dependent. The much bigger challenge turns out to be how to soak the lightweight aggregate...

Good day - Any experience with concrete placement at temperatures in the 20F to 40F range without use of heat? Some manufacturers admixtures are advertised to protect the concrete down to 20F. Ever the skeptics, we are seeking input from unbiased, experienced sources. Situation is lightweight...

Also consider the performance of epoxy at elevated temperatures. You'll probably find the zinc poured fittings outperform the epoxies.