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At a time when more and more companies are demanding effective use of their dollars, more companies in the shotcrete industry are realizing the benefits of becoming an ASA Sustaining or Corporate Member.
Contractor Qualification
- ASA Qualified Shotcrete Contractor – Structural Level I or II (QSC – SI or SII)
- ASA Qualified Shotcrete Contractor – Pool (QSC – Pool)
QSC Code of Conduct
An ASA Qualified Shotcrete Contractor shall adhere to the following QSC Code of Conduct: “As an ASA Qualified Shotcrete Contractor, we agree to ongoing compliance with the requirements and standards set forth in the ASA Shotcrete Contractor Qualification Program description. We will not knowingly or purposefully violate any project specifications or requirements. We agree to maintain required insurance coverage, staff our projects with trained and certified personnel, and strive to produce a high-quality product in a safe and professional manner.”
Shotcrete has often been described not as a material but as a process. Both wet and dry processes produce a material that exhibits superior hardened properties to high quality conventional concrete, such as high strength, low permeability, and high durability.
Although the hardened properties of shotcrete are similar to conventional cast-in-place concrete, the nature of the shotcrete placement process provides additional benefits, such as excellent bond with most substrates and instant or rapid capabilities, particularly on complex forms or shapes.
The properties of both wet- and dry-process shotcrete can be further enhanced through the addition of many different additives or admixtures such as:
- Silica Fume — Provides reduced permeability, increased compressive and flexural strength, increased resistance to alkali and chemical attack, improved resistance to water washout, reduced rebound levels, and allows for thicker single pass applications;
- Air-Entraining Admixtures — Improve pumpability and adhesion in wet-process shotcrete and freeze-thaw durability in both wet and dry processes;
- Fibers — Control cracking, increase toughness values, improve impact resistance and energy absorption; and
- Accelerators — Improve placement characteristics in adverse conditions, allow for thicker single pass applications, increase production capabilities, and reduce the occurrence of fallouts on structures subjected to vibration.
The numerous advantages of the shotcrete process are especially evident when viewed from a sustainability point of view. Unlike many sustainability claims that are based on political or social ideals that are often difficult to quantify and substantiate, the sustainability advantages of the shotcrete process directly and positively impact the economic side of a project, falling in-line with traditional business decisions such as material, labor, and time savings as well as improved quality.
In addition to the following “top ten” sustainability advantages of shotcrete, ASA’s Sustainability page offers a wealth of information on the topic.
- Formwork savings of 50 to 100% over conventional cast-in-place construction;
- Formwork does not have to be designed for internal pressures;
- Complex shapes require very little, if any, formwork;
- Crane and other equipment savings or elimination;
- Labor savings of at least 50% in repair applications;
- New construction speed savings of 33 to 50%;
- Speed of repair reduces or eliminates downtime;
- Better bonding to the substrate, which enhances durability;
- Adaptability to repair surfaces that are not cost-effective with other processes; and
- Ability to access restricted space and difficult-to-reach areas, including overhead and underground.
Wet or Dry?
Although both wet and dry shotcrete have specific benefits, advancements in both material and equipment technology make both processes almost interchangeable. In most applications, the preferred method is determined by:
- Economics;
- Availability of material and equipment;
- Site access; and
- The expertise and preference of the contractor.
Today, rebound levels, dust levels, and properties such as bond strength, compressive strength, and durability can be similar whether the wet or dry method is used.
The shotcrete process is truly one of the most versatile processes available for the use of concrete in both new construction and repairs. Shotcrete can be used in almost any concrete project and typically results in a significant savings of time and money. The following list is a sample of the almost limitless applications for shotcrete.
Pool Portal
Repair Portal
Architectural Portal
Underground Portal
Certification & Qualification
Awards Portal
ASA Conventions
World of Concrete
Structural Portal
International Portal
Recreational Portal
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Shotcrete Magazine
Shotcrete, the quarterly publication of ASA, is the leading magazine of the shotcrete industry, and is designed to educate and promote the use of shotcrete as a method of placing concrete.
What’s in the Mix
ASA produces member and nonmember editions of a monthly e-Newsletter titled, “What’s in the Mix.” These monthly e-Newsletters keep you informed of your association’s new products, services, events, and other initiatives.
Current Sustaining and Corporate Member Shotcrete Magazine Advertisers
Understanding What Can Cause Problems with Concrete and Shotcrete – Part 1
This is Part One of a two-part series on potential causes of problems in concrete and shotcrete.
When Cement Turns Against You
Cement is at the center of our industry. A common safety issue and hazard with it is cement burns.
Properly Securing Hoses to Manlifts and Scaffold
Decades ago, a seasoned carpenter showed me how to tie 2x4s and reinforcing bar together so I could lower it down a shaft without losing the load.
Concrete in the Cloud
The world is becoming more and more connected and it was only a matter of time before we saw it in the concrete industry as well.
Understanding What Can Cause Problems with Concrete and Shotcrete? Part 2
This is Part Two of a two-part series on potential causes of problems in concrete and shotcrete.