The benefits of using SHRINK-COMP Shrinkage-Compensating Concrete for floor construction are superior for solving specific problems related to concrete floors subjected to hard-wheeled traffic.

Conventional floor design
SHRINK-COMP joint-less floor design
Conventional floor design versus SHRINK-COMP joint-less floor design

With conventional floor design, contraction joints are used every 5-7 m in both directions to avoid random cracking of concrete.

With SHRINK-COMP design, generally, 1600 sqm floor panels can be built without any joints and cracks, with 40 m joint spacing.

Conventional floors curl (0.5-2 cm) at every sufficiently wide joint and crack, causing joint spalling and reduced floor flatness.

With SHRINK-COMP design, curling is greatly reduced or completely eliminated; the original flatness is preserved during the lifetime of the floor.

To reduce stress from restrained shrinkage and excessive curling, conventional floors need to be built thicker.

Floor thickness can be dramatically -with 3-5 cm- reduced, as SHRINK-COMP design eliminates tensile stress from shrinkage and curling.

ADVANTAGES

What are the benefits of choosing SHRINK-COMP joint-less industrial floors?
1 Less maintenance

Minimizing cracks and joints results in a less-maintenance or no-maintenance floor, with virtually no need for joint repair and with little, if any, cracking issues.

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2 High speed lift trucks

By eliminating the upward curling of joint edges, the floor's original flatness is maintained. Floor flatness establishes the speed of lift truck operations.

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3 Reduced floor thickness

Shrinkage-Compensating Concrete eliminates stresses from curling that is mainly responsible for cracks in between joints, thus floor thickness can be reduced by 3-5 cm with increased load capacity.

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4 Low life-cycle cost

Despite higher concrete unit price, life-cycle cost of Shrinkage-Compensating Concrete floors is fairly moderate due to economic design and low maintenance cost.

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APPLICATION

How does Shrinkage-Compensating Concrete work?
How it works

SHRINK-COMP utilizes Shrinkage-Compensating Concrete for floor construction. Shrinkage-Compensating Concrete is achieved through the incorporation of an expansive agent, DENKA CSA#20, in the concrete mix, that causes volume increase after setting. Elastically restrained volume increase of concrete compensates for subsequent shrinkage. Offsetting tensile stresses from shrinkage allows us to eliminate joints without cracking. Joints and cracks are equally asking for trouble and their maintenance has to be taken care of regularly to ensure satisfactory floor performance.

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How it is used

Ultimate concrete expansion and rate of expansion are key factors when it comes to full shrinkage compensation. The actual expansive properties of Shrinkage-Compensating Concrete are developed through complex interactions between the various constituents of the concrete mixture. Main influencing factors are the type of cement, water to cement ratio, steel reinforcement ratio, type and dosage of expansive agent, etc. Thus, the above explained results and success is best achieved by performing proper material and floor design supported by laboratory tests for each project.

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To learn more, please download our brochure, that not only describes our technology but gives information about industrial floors in general to help you get better understanding and make a good decision when it comes to selecting your floor. Make your choice of floor a priority!
Less maintenance

Over the floor's lifetime joints grow, sealers fail and joint edges spall – especially if subjected to heavy hard-wheeled traffic. Gradually floors become unsightly and to preserve proper serviceability, joints must recieve extensive repairs on a regular basis.

In general, joint length for 1000 sqm conventionally designed floor is 300 m. 80-90% joint length reduction can be achived with Shrinkage-Compensating Concrete,so the total joint length on 1000 sqm comes to 30-60 m. Since floors primarily fail at joint locations, by eliminating 80-90% of the joints Shrinkage-Compensating Concrete addresses the source of floor problems and escalating cost.

High speed lift trucks

The speed of lift truck operations is -in large part- governed by floor flatness. If the floor is too bumpy, the lift truck will shake too much, and the driver won't drive the vehicle at top speed. As a result, more trucks will be needed to move the same number of pallets.

Since curling (0.5-2 cm) occurs at every grown joint and crack, floor flatness is greatly reduced. Curling will also cause rocking floor panels. In other words, curling is not desireable on any surface. Shrinkage-Compensating Concrete greatly reduces or completely eliminates curling.

Reduced floor thickness

Upward curling of joint edges often causes mid panel cracks. This tendency can be reduced by increasing floor thickness and decreasing joint spacing. However these provisions are often neglected due to strong price competition, as they increase the floor's construction cost.

Floors made with Shrinkage-Compensating Concrete don't curl. For common industrial loads -meeting specific subsoil and subgrade requirements- a 15 cm thick SHRINK-COMP floor performes adequately (3-5 cm reduction when compared to conventional floors). When using Shrinkage-Compensating Concrete, stresses in the floor from shrinkage and curling are eliminated, thus floor thickness can be reduced with increased load capacity.

Low life-cycle cost

Despite higher concrete unit price, life-cycle cost of Shrinkage-Compensating Concrete floors is fairly moderate due to economic design and low maintenance cost.

Maintenance cost and downtimes due to joint repair add up during the lifetime of the floor and may very well be that conventional floors cost more in the long run than a high-performace joint-less floor. SHRINK-COMP joint-less floors are recommended to building owners who discovered the direct correlation between floor quality and operational efficiency in their buildings.

How SHRINK-COMP concrete works

SHRINK-COMP floors are made by utilizing Shrinkage-Compensating Concrete. Shrinkage-Compensating Concrete is achieved through the incorporation of an expansive agent, DENKA CSA#20, in the concrete mix, that causes volume increase after setting. Elastically restrained volume increase of concrete compensates for subsequent shrinkage.

The noted elastic restraint is provided by properly sized and located steel reinforcement. Concrete expansion is tensioning the mild reinforcing steel, thereby inducing compressive stresses in the concrete, that are intended to offset the tendency of shrinkage to induce tensile stresses. Offsetting tensile stresses from restrained shrinkage with 'precompression' allows us to eliminate joints that are meant to relieve tensile stresses built up in the floor during shrinkage.

How SHRINK-COMP concrete is used

Ultimate concrete expansion and rate of expansion are key factors when it comes to full shrinkage compensation. The actual expansive properties of Shrinkage-Compensating Concrete are developed through complex interactions between the various constituents of concrete. Main influencing factors are the type of cement, water to cement ratio, steel reinforcement ratio, type and dosage of expansive agent, etc. Thus, the above explained results and success is best achieved by performing proper material and floor design supported by laboratory tests for each project.

As per our normal routine, we run preliminary lab tests before construction using local materials to adjust the concrete mix to have the desired expansive properties, to minimize shrinkage and to maximize workability. Then we continue working with the ready-mix plant and the flooring contractor. Our on-site QC concrete lab is present during construction to ensure the specified concrete mix is delivered. We provide the flooring contractor with a complete set of floor specifications. We also instruct and supervise him, if he has little or no experience with Shrinkage-Compensating Concrete.

By integrating all the above steps into our standard routine, we carry out the most profound design and quality control process that can possibly be done for industrial floor construction.