HomeMy WebLinkAboutLetter; Concrete Crack Inspection.' KSM
KELLER, SCHLEICHER & MacWILLIAM ENGINEERING AND TESTING, INC.
MARTIN (772) 337-7755. P.O. BOX 78-1377, SEBASTIAN, FL 32978-1377 SEBASTIAN (772) 589-0712
PALM BEACH (561) 845-7445 C.A.: 5693 P.E.: 37293 S.I.: 860 MELBOURNE (321) 768-8488
FAX (561) 845-8876 E-MAIL KSMQKSMENGINEERING.NET ST. LUCIE (772) 229-9093
FAX (772) 589-6469
April 15, 2008
Maronda Homes, Inc.
4610 Lipscomb Street
Suite 1
Melbourne, Florida 32905
Re: 5216 Manciano Street
Unit 2, Waterstone S/D
Port St. Lucie, Florida
Job #: 30WT002
EVPO #: 7225943
KSM Project #: 703308
Dear Sir:
RECEIVED
APR 112008
public WorkS
St. Lucie County, FL
As requested, an on -site visit was made to inspect the concrete crack in the
garage.
In the area of the "crack", a "Swiss Hammer Test" (ASTM C805) was performed.
Also, soil density of the structural fill was measured beneath the foundation to a
depth of four feet around the residence using a Brainard-Killman model S-214
cone penetrometer. Penetrometer readings indicated that the soils were
generally well compacted.
Test results indicate that the concrete exceeded the design strength of 2,500
P.S.I. Fiber mesh was placed in the concrete rather than welded wire mesh.
Based on the location and' nature of the crack and this investigation, it is our
professional opinion the crack is not a structural crack, but rather a shrinkage
crack. We believe this crack resulted from water reduction due to the drying of
the concrete caused by evaporation and the chemical reaction of the hardening
process of the concrete during placement. This reduction of volume produced
tensile stresses exceeding the tensile strength of the concrete and therefore
cracked.
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KELLER, SCHLEICHER & MacWILLIAM ENGINEERING AND TESTING, INC.
MARTIN (772) 337-7755 P.O. BOX 78-1377, SEBASTIAN, FL 32978-1377 SEBASTIAN (772) 589-0712
PALM BEACH (561) 845-7445 C.A.: 5693 P.E.: 37293 S.I.: 860 MELBOURNE (321) 768-8488
FAX (561) 845-8876 E-MAIL KSMQKSMENGINEERING.NET ST. LUCIE (772) 229-9093
FAX (772) 589-6469
d
5216 Manciano Street -2- April 15, 2008
Waterstone S/D
In conclusion, this crack should not affect the structural integrity or future life
expectancy of the concrete.
h
e any questions,please feel free to call us.
ully,
. Kelle P.E.��� O