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What are the structural differences of non-shrink grout v. portland cement
and sand. I know that the grout sets up faster and does not shrink, but what are the differences in terms of compressive and tensile strength. Also , how does the addition of pea gravel effect the grout. My grout doesn’t show any info on psi etc.
Thanks,
Bear
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Bear,
The non-shrink grout is at least three times the compressive strength of a sand and cement mix. It is not ever, to my knowledge, used where tensile loading is anticipated, only compression. I seem to recall the figure 12,000 psi from a package of grout in the past, and it is reached rapidly. If you need the high strength grout is capable of, you ought to consult the manufacturer before adding any aggregate or other ingredients. Non-shrink grout is designed to be applied neat. For the best strength, a dry, almost crumbly mix is called for.
Bill
*Bear,Pea gravel can be added to grout, and is reccommended, if the thickness will exceed 1". Most non-shrink grouts actually expand a very small amount as they cure (opposite to concrete). All grout should be clearly marked as to it's compressive strengthJerry
*Non-shrink grout runs about 9000 psi and is composed of silica sand and cement, additives such as pea stones are not used as a rule.Gabe