TB-1202 - A Guide to GCP SDS™ STRUX® Slab-On-Grade Design Software

GCP Applied Technologies SDS™ STRUX®  Slab-On-Grade Design Software enables the Engineer to design slab-on-grade using the latest in synthetic macro fiber technology. STRUX®  90/40 Synthetic Macro Fibers are a unique form of high strength, high modulus synthetic macro reinforcement that is distributed uniformly throughout the concrete matrix. STRUX®  90/40 fibers adds toughness, impact and fatigue resistance to concrete and can replace welded wire mesh, steel fibers, or rebar for crack control secondary reinforcement.

The use of synthetic macro fibers as a replacement for crack control in flooring applications is becoming more accepted due to various advantages such as tight crack control, ease of use, safe handling, construction placing techniques, faster slab construction, and the elimination of corrosion potential.

GCP’s SDS™ software is a user-friendly, flexible software tool for designing slab-on-grade and can be used to design a variety of light to heavily loaded commercial, industrial, and educational facilities.

The software program was developed to aid in determining which design is the most cost-effective for long-term performance under given conditions. Engineers enter slab parameters, such as slab thickness, concrete strength, sub-surface soil conditions, and load factors. SDS™ provides the most advantageous dosage rates of STRUX®  90/40 fibers dependent on the input parameters.

The software is primarily based on the Yield Line Theory (1960, 1962, 1983), Technical Report 34 from the British Concrete Society (2003), Eurocode 2, and ACI-318 and 360.

Consultation and availability of the GCP SDS™ is accessible through the local GCP Representative.

This information is provided as a guide. Final design decisions of the concrete slab are the responsibility of the engineer of record.

Examples of projects where SDS™ software was used to designate the most efficient and cost effective dosage of STRUX® 90/40 fibers to meet design specifications, based on a Modulus of Subgrade Reaction of 100 lbs/in.3 (28 MPa/m2):

Vehicle Parking Garage  
Loading 10,000 lbs 10,000 lbs
Load conditions 4 wheels on two axles, 35 psi tire pressure
Fork lift load None
Rack load None
Proposed design thickness 5 in.
SDS™ Software design recommendations 3.5 lbs/yd3 dosage @ 4,000 psi concrete
School Office  
Office loading 500 lbs/ft2
Load conditions Uniform – file cabinets, desks, foot traffic
Fork lift load None
Rack load None
Proposed design thickness 4 in.
SDS™ Software design recommendations 3.5 lbs/yd3 dosage @ 3,000 psi concrete
Industrial Floor  
Joint conditions Doweled joints; 15 ft x 15 ft
Load conditions Forklift
(pneumatic – 125 psi),
foot traffic
Fork lift load 10,000 capacity fork lift, single axle load = 22,200 lbs
Rack load None
Proposed design thickness 6 in.
SDS™ Software design recommendations 4.7 lbs/yd3 dosage @ 4,000 psi concrete



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U.S. Patent Nos.: 6,569,525; 6,569,526; 6,758,897; 6,863,969

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GCP Applied Technologies Inc., 2325 Lakeview Parkway, Suite 450, Alpharetta, GA 30009, USA
GCP Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6
This document is only current as of the last updated date stated below and is valid only for use in the United States. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on www.gcpat.com. Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

Last Updated: 2022-05-10