05-23-2000 Council Agenda - Laserfiche WebLink

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612 - 3386838 HOISINGTON KOEGLER Mr. tool Hanson Sfreafscnpe Amenities for Little Canada Road 19 May 2000 Page 2 324 P03 MAY 19 '00 13:44 3 Why were pavers changed to colored concrete? We understand that resources for amenities on this project are limited. As a result, we have attempted to provide interesting elements and patterns without significant additional cost. We felt that colored concrete walks would provide a similar level of interest, without the premium that pavers would add to the bottom line. The materials and additional formwork required to integrate pavers into the design would be significant, and we would prefer that resources be spent on features that are vertical and rise above the ground (rather than being expended on features that would be appreciated only by pedestrians). For cost comparisons, the colored concrete walk might range from about $4.50 to $5.50 per square foot. The use of brick or concrete pavers might range from about $7.50 to $10.00 per square foot. We could make adjustments in the plans so that the total quantity of pavers would be about 6700 square feet, resulting in a net additional cost of approximately $20,000 to $35,000 (depending on which end of the cost ranges indicated above are chosen). From a "constructability" standpoint, the brick or concrete pavers might best be installed in a concrete "trough" — where the concrete walk is thickened and a slot formed to accept the pavers. The pavers are then set in a sand bed (not mortared); drainage is provided in the slot to remove water. We have found this to be a very acceptable long term solution; there is no settlement or heaving of pavers (issues that cause concerns for maintenance and walkability). Stamping the concrete to create a brick impression in the concrete is anothertoption. A form is pressed into the wet colored concrete surface, leaving a brick impression. The costs of this option would be somewhat less than pavers — perhaps in the $5.00 to $7.00 per square foot range. There have been concerns in the past over this kind of surface treatment. Terry Maurer can relate stories of "Bomanite" (a trade name) used in Elk River that failed (as a result of the concrete mix, if 1 remember correctly). Current technologies may make this a more reasonable alternative, and from the contractor standpoint, it may even be an easier surface finish to achieve than a broom or smooth floated finish with tooled joints (as the brick form actually creates the required control joints in the walk surface). 4 What colors are "bright buff" and "copper ?" Both colors are standard admixtures for coloring concrete available through Prism, a company that makes color additives for concrete. Bright buff is a buff color that somewhat resembles Mankato Kasota stone (a limestone quarried near Mankato). It is "yellowish" and generally works well with both plain concrete and many other colored concrete surfaces. The bright buff is used in portions of the concrete walk, as well as in precast concrete elements (the markers and bollards). Copper is muted red color (it is not really very much like copper at all, but that is the name it has been given). The copper colored concrete is only used in the concrete walk. Both colors are integral to the concrete walk (that is, the color extends through the entire concrete walk). Our experience is that these color combinations provide reasonable color variations without being overwhelming. We have found that contractors are using Prism color additives more often than the more typically specified Scofield color additives — for cost reasons most likely. For anyone more familiar with Scofield colors, "bright buff" is similar to Scofield's "mesa beige" and "copper" is similar to Scofield's "tawny pink." Page 68