I - Answer the following by True or False or fill in the answer. The allowable structural capacity of lumber is usually based on the average breaking strength of various species and sizes.
Most shrinkage occurs across the grain of wood.
A calcarous deposit would usually dictate the location of a concrete batch plant. Calcium chloride is an excellent economical accelerator for concrete. The use of calcium chloride in concrete reduces the potential for corrosion of steel in reinforced concrete. To produce a workable nonsuperplasticized concrete you need at least 100 lbs. of water per cu. Air-entrainment will increase the total porosity and reduce the strength in a high cement mix.