HomeMy WebLinkAboutPROSPECT SPORTS CLUB - FDP240002 - SUBMITTAL DOCUMENTS - ROUND 2 - Geotechnical (Soils) Report (2)
Soilogic, Inc.
3522 Draft Horse Court • Loveland, CO 80538 • (970) 535-6144
December 27, 2022
RB+B Architects, Inc.
315 E. Mountain Avenue, Suite 100
Fort Collins, Colorado 80524
Attn: Ms. Rebecca Spears
Re: Water-Soluble Sulfate Testing Report
Prospect Properties Basketball Facility
Lot 5, Prospect Park East, P.U.D.
1601 Sharp Point Drive, Fort Collins, Colorado
Soilogic # 22-1426
Ms. Spears:
Soilogic Inc. (Soilogic) has received results of subcontracted water-soluble sulfate (WSS)
testing completed for the referenced project. Results of the completed laboratory tests and
associated geotechnical engineering recommendations are included with this report.
Water-soluble sulfates (WSS) tests were completed by a subcontracted laboratory on two
(2) representative samples of the subgrade soils which will likely be in contact with
structural concrete. The sulfate concentrations measured in the samples varied from
0.0676 to 0.1942 percent by weight in soil. ACI rates the measured concentrations as
being a negligible to moderate risk of concrete sulfate attack. For moderate sulfate
exposure, ACI recommends the use of Type II cement, a maximum water cement ratio of
0.50 and minimum compressive strength of 4,000 psi for concrete members in contact
with corrosive soils/water.
Utilizing the proper cement type and water/cement ratio outlined above will not eliminate
the potential for sulfate attack. Even concrete mixes utilizing Type V cement for ‘severe’
environments will deteriorate eventually under sulfate attack. Limiting the permeability
of the concrete and good concrete consolidation and curing procedures are more
important than cement type to reduce this risk. Air entrained structural concrete is
recommended because these admixtures will reduce the mix water/cement ratio and
resulting concrete permeability. Establishing a maximum water/cement ratio of 0.45 for
structural concrete could also be considered to further increase sulfate resistance.
Water-Soluble Sulfate Testing Report
Prospect Properties Basketball Facility - Lot 5, Prospect Park East, P.U.D.
1601 Sharp Point Drive, Fort Collins, Colorado
Soilogic # 22-1426
2
Foundation concrete should be designed in accordance with the provisions of the ACI
Design Manual, Section 318, Chapter 4.
We appreciate the opportunity to be of service to you on this project. If you have any
questions concerning the enclosed information or if we can provide any further
assistance, please do not hesitate to contact us.
Very Truly Yours,
Soilogic, Inc. Reviewed by:
Darrel DiCarlo, P.E. Alec Kaljian, P.E.
Senior Project Engineer Project Engineer
12/27/2022 12/27/2022