Assertion: concrete | /r/HasProperty | less than 0.45
Facets:
Source sentences:
text: For the best defense against external sulfate attack, concrete with a low water to cementitious material ratio (w/cm) (less than 0.45 for moderate sulfate environments and less than 0.40 for more severe environments) should be used along with cements or cementitious material combinations specially formulated for sulfate environments