Hennepin County

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PROJECT QUESTION: Related to the question earlier regarding 3Y GROUT, please provide a mix design and specification for this material; it is not included in standard spec. 2461. Also, the answer stated that the compressive strength needs to be 4000 psi before deck panel placement; what?s the anticipated duration for this 3YGROUT to obtain 4000 psi?

Question: Related to the question earlier regarding 3Y GROUT, please provide a mix design and specification for this material; it is not included in standard spec. 2461. Also, the answer stated that the compressive strength needs to be 4000 psi before deck panel placement; what is the anticipated duration for this 3YGROUT to obtain 4000 psi?

Response: The requirement for 3Y GROUT will be removed from the specification and replaced with requirement to use MnDOT approved non-shrink structural grout. Rapid set grout may be used to achieve the required design strength prior to placing future precast or non-precast elements.