Exhibitor Guide
Exhibit Floor Plan


Resort Map

For an overview of Ojai Valley Inn, please see the property map here.

Health & Safety Information

For the complete list of Health and Sanitation Standards at Ojai Valley Inn, please see here. Procedures and guidelines will be updated and modified as new regulations are developed.

If you have any questions, please contact Concierge at (805) 646-111 extension 51.

Things to Do

Ojai Trolley Service

The Inn is pleased to offer the Ojai Trolley Service to guests. Reminiscent of a bygone and relaxed era, guests may take a leisurely trip downtown to enjoy eclectic shopping, wine tasting, art galleries and farm-to-table eateries.

Saturday and Sunday, the trolley picks up our guests every other hour.


Fly Ash Supply Today and Tomorrow

Tom Adams

The demand for fly ash and other supplementary cementitious materials (SCM) has been growing for some time and is expected to continue to grow as the demand for increased durability of concrete structures grows. At the same time, the increased use of SCM is an important part of the efforts to reduce the carbon footprint of concrete mixtures. This presentation will focus on today’s energy market realities and efforts to close the gap between supply and demand.

Underground Shotcrete in Remote Alpine Areas

Christoph Goss

One of the most challenging environments for shotcrete work is underground at high altitude in very remote areas. Access limits the size of equipment, compressors must be oversized, and material is difficult to get and mix. This presentation will use two case studies to illustrate these challenges and how they were addressed: Rio Grande Reservoir Outlet Rehabilitation and Gold King Mine 7 Level re-support. Both projects feature shotcrete used as ground support in tunnels and portals. The presentation will conclude with recommendations and lessons learned. 

Clear Vision: Integral Dust Reduction in Dry Mix Shotcrete Mixes

Thomas Brennan

Given its impact on construction site safety, dust exposure is a key consideration on almost any jobsite. Continued increases in OSHA regulations around allowable exposure to airborne particulates has impacted the tools and procedures required for dust-heavy construction work activities. Because concrete repair projects commonly involve dusty activities in confined spaces, additional planning and precaution must be taken to counteract dust generated from any applicable repair activities. Given all these considerations, manufacturers and installers of pre-packaged dry-mix shotcrete have been challenged with developing materials and methods for mitigating dust on a traditionally high-dust activity.

Plasma Tunnel Boring Shotcrete Lining

Troy Helming

Attendees will learn about how shotcrete can be used to quickly line tunnels of 2.5 meters to 10 meters in diameter. While the testing done thus far is preliminary, modified formulations of shotcrete allow for rapid curing by taking advantage of the inherent heat of up to 80 degrees Celsius in the tunnel walls after the hot plasma (temps in the plume of up to 6,000 degrees C) has bored the tunnel. 

Inspection and Selection of Shotcrete Delivery System

Michael Cetnar

In our discussion we will talk about choosing the proper hose, pipe, and clamps for your project.

  1. How do we determine the proper delivery system to use?
  2. We will discuss the advantage of heat treated parts vs non heat treated parts.
  3. What are the differences between wire and fabric shotcrete hose?
  4. Choosing the right clamps for your delivery system.
  5. How do we inspect our delivery system?
  6. What do we look for in hose inspection?
    • What do we look for in pipe, elbow and reducer inspection?
    • What tools should we use during these inspections?
  1. What safety publications are out there that we need to be aware of? (ASME B30.27 and CSA Z151) 

Robotic Shotcrete Placement – Key Issues & Certification Panel

Oscar Duckworth, Christoph Goss & Frank Townsend

Questions & Discussions Session

Development of a New Dry-mix Shotcrete Nozzle Assembly

Marc Jolin

This presentation will introduce a new nozzle assembly design for dry-mix shotcrete developed at the Shotcrete Laboratory in Université Laval. Attendees will learn how basic placement mechanisms play a fundamental role in the formation of rebound and dust during placement. Following a clear description of the testing protocols for rebound losses and dust emissions, laboratory test results based on various mixture design will be presented for various features of the new nozzle assembly. The results show not only a marked rebound and dust reduction, but also demonstrate improved in-place compressive strengths.

Courthouse Commons Tunnel

Sam Lo Grasso

The Courthouse Commons Tunnel located in San Diego; California is a 327ft long tunnel that provides a safe means for transferring prisoners from the San Diego County Jail to new State Courthouse. The tunnel was constructed using an observational excavation method that utilized shotcrete for the initial ground support in conjunction with lattice girders, canopy tubes and spiles. The final lining was cast in place concrete designed for seismic conditions. This presentation will focus on the design and application of the shotcrete in the encountered ground conditions and the challenges that were overcome to achieve a successful project outcome.

Gaining Market Acceptance & Approvals for Structural Shotcrete

Ross King

  1. Present a few examples of projects from different sectors where we used Innovative Structural Shotcrete solutions and were accepted and approved.
  2. Discuss the incentives and advantages we used to push for Structural Shotcrete as an alternate with the client, prior to even being considered for consultant approval.
  3. Strategies used to convince the designers and make them more comfortable with the process, and the finished product.
  4. Discuss the barriers to acceptance that are thrown at the Shotcrete process from many different directions by different parties.
  5. Where I see the future trends, and the potential to use these approvals and successes to further grow the Structural Shotcrete market.

Construction of Thick, Heavily Reinforced Underground Station Walls Using Low Heat of Hydration 70% Slag Shotcrete at Mount Pleasant Station on the Eglinton Crosstown LRT Project in Toronto, Canada

Shaun Radomski

Mount Pleasant Station on the Eglinton Crosstown LRT Line in Toronto used a low heat of hydration 70%

slag shotcrete for construction of 1.5 m thick, heavily reinforced underground station walls. This

presentation provides details of this work, including:

  1. Structural wall design
  2. Shotcrete performance requirements;
  3. Qualification of mixture design and nozzlemen in shooting full-scale mockups;
  4. Shotcrete equipment set-up and staging;
  5. Shotcrete construction sequencing, productivity and challenges to overcome while shooting the work;
  6. Shotcrete Supply, pumping, application, finishing, curing
  7. Rigorous quality inspections, compressive strength tests and thermal monitoring records; and
  8. Completed station walls.

Shotcrete vs Low Velocity Sprayed Mortar (LVSM): What are the differences?

Christine Poulin & Marc Jolin

Shotcrete is a well-accepted method for the placement of concrete, and it offers specific advantages in the repair industry where the high material velocity allows for placement of a well compacted concrete layer, even in the presence of reinforcing bars. Some job sites have however seen the use of low velocity sprayed mortar (LVSM) for concrete repairs, and the very limited technical information available on the performance of repair systems using LVSM led to a research project to evaluate its capacity to achieve good adhesion with the substrate and proper reinforcing bar encapsulation. The objective of the presentation is therefore to present and discuss the differences between LVSM and shotcrete based on sound technical results collected during a master’s project conducted in the Shotcrete Laboratory at Université Laval. 

Innovative Tunnel Solutions for Underground Infrastructure Projects

David Rheault

Public transit infrastructure expansions are notoriously challenging. While many projects envision Tunnel Boring Machines (TBM) and open-cut excavations, other construction approaches become preferable as owners begin to appreciate the total cost of construction. The Sequential Excavation Method (SEM) has provided efficiency and flexibility in constructing underground stations and connection tunnels throughout North America. Eglinton Crosstown LRT and Highway 401 Rail Tunnel projects in Toronto, Canada will be highlighted with particular attention to the benefits of fiber-reinforced shotcrete linings with advanced numerical modeling, testing, and construction aspects. The SEM designs successfully optimized shotcrete performance and eliminated conventional bar reinforcement needs.


Tom Adams
Thomas Adams has served as the executive director of the American Coal Ash Association (ACAA). Prior to joining the ACAA, he was on the staff of the American Concrete Institute and served as the executive director of the American Shotcrete Association. Mr. Adams has over 30 years of experience in the ready-mixed concrete industry in sales, marketing, and technical services roles. He is a Fellow of the American Concrete Institute and a recipient of the Richard D. Gaynor Award from the National Ready Mixed Concrete Association. Thomas Adams attended Wayne State University, Detroit, Michigan, and Aquinas College, Grand Rapids, Michigan studying strategic business management. He is a native of Detroit and currently resides in Bloomington, Indiana.
Thomas Brennan
Tommy Brennan, USCP Sales Engineer: Mr. Brennan holds a Bachelor of Science in Mechanical Engineering from the University of Massachusetts, Amherst, and has spent his entire career in Construction related roles. After over four years leading construction of major capital projects as a Project Engineer with ExxonMobil in Houston, Mr. Brennan joined USCP in October of 2021 to further his career with cementitious materials. Tommy currently oversees the QC program, assists with Sales and Operations, and leads development of new products for USCP. A detailed understanding of USCP’s product offer has also made Tommy instrumental in sourcing raw materials and admixtures needed to maintain competitive pricing and lead times for manufacturing projects. From an industry perspective, Mr. Brennan is ACI Field Technician I certified and an active member of the American Shotcrete Association as well as the ICRI Baltimore-Washington chapter.
Michael Cetnar
Michael has worked in the concrete pumping industry for 30 years. His job responsibilities have included being a mechanic, a boom truck operator, a trailer pump operator, an operator superintendent and a delivery system salesperson. For the last 10 years, he has been at Conforms as a Regional Manager and Safety Specialist. He is recognized by several organizations as an industry expert. He has also been involved with different organizations to help review and write safety standards for the concrete pumping industry.
Oscar Duckworth
Oscar is an ACI-certified Nozzleman and ASA/ACI examiner for both the wet- & dry-mix processes. He is the incoming ASA Secretary and chairs the ASA Education & Safety Committee. He also leads an ACI nozzleman certification task group to consider how ACI may be able to certify nozzlemen using remotely manipulated nozzles for shotcrete placement.
Christoph Goss
Christoph has a PhD in Mining Engineering and BS in Civil Engineering both from Colorado School of Mines. His work has been mostly in tunnels (hard rock and soft ground), underground mine rehabilitation, ground support design, site investigations, and as resident engineer during construction. He has been an ACI Shotcrete Nozzleman Certification Examiner since 2007 and chair the Underground Committee of the American Shotcrete Association.
Troy Helming
Troy Helming is a Unicorn Founder (with 6 company exits) and a modern-day industrialist. He’s an inventor (60+ patent claims), an elite athlete, an author (1 book + 100s of articles), and a clean energy executive. He’s founded companies that have generated more than $30 Billion of economic impact, and he serves on numerous boards. He’s a longtime wellness practitioner & yogi.
Marc Jolin
Dr. Marc Jolin is a Full Professor in the Department of Civil and Water Engineering at Université Laval in Québec City, Canada. He received his Ph.D. from the University of British Columbia, Canada, in 1999. An active member of the Centre de Recherche sur les Infrastructures en Béton – CRIB, his research focuses on shotcrete. A recognized and appreciated researcher and educator, Dr. Jolin is an active member of the American Concrete Institute and the American Shotcrete Association.
Ross King
Ross King, President Consolidated Shotcrete Inc., 50 years as owner operator in the Concrete Formwork Industry and 16 years in the Structural Shotcrete business. Ranging from Residential Hi-rise to Civil Infrastructure including Subways, Particle accelerator, Avalanche shed, and Elevated LRT guideways.
Sam Lo Grasso
Sam is experienced in the design, management, and construction of underground infrastructure projects. His experience includes the design and construction of various underground structures, including sprayed concrete, cast-in-place tunnel linings, segmentally lined tunnels, cavern linings, slurry walls, and pile walls. Sam is a proficient design manager, who has experience in delivering multi-disciplinary tunnel projects for rail, material handling, water and wastewater, and road infrastructure. Sam is a Professional Engineer licensed in California and New York.
Rachel McDowell
Rusty Morgan
Dr. Dudley R. (Rusty) Morgan, is a Civil Engineer with over 55 years experience in concrete and shotcrete technology and the evaluation and rehabilitation of civil engineering infrastructure. After 10 years in academia in South Africa, Canada and Australia, he returned to Vancouver, BC, Canada, where he worked as a consultant for Wood Plc and its predecessor companies on over 1200 projects all over the world. He was a Founding Member and Past President of the American Shotcrete Association.
Christine Poulin
Christine Poulin, P. Eng., M. Sc., is a Technical Sales Engineer for the Shotcrete, Tunneling and Mining (STM) division for Sika Canada Inc. She received her bachelor’s degree in civil engineering in 2017 at Université Laval in Quebec City, Canada, while working as a research assistant in the Shotcrete Laboratory. In 2019, she received her master’s degree in civil engineering in shotcrete at the same university supported by a Mitacs Accelerate Research Grant and the American Shotcrete Association (ASA). After three years at a material consulting engineering firm in Montreal, Canada, Christine joined the Sika STM-division in 2021, where she focuses on the shotcrete and tunneling markets.
Shaun Radomski
Shaun M. Radomski is a Construction Materials Engineer specializing in concrete and shotcrete technology and the evaluation and rehabilitation of infrastructure. He has 17 years of civil materials engineering and testing experience in Canada and in the United States. Based in Calgary, AB., Mr. Radomski has extensive shotcrete consulting, inspection and testing experience North America wide, all with WSP and predecessor companies, including the use of:
• Wet-mix and dry mix shotcrete;
• Vertical and overhead;
• Shotcrete underground;
• Alkali free accelerator addition at the nozzle; and
• Incorporating steel fibre, polypropylene fibre and natural hemp and cellulose based fibres in shotcrete mixes for added toughness and for controlling shrinkage cracking.
Mr. Radomski has provided consulting, testing and inspection services on projects which involved:
• Construction of structural walls for many underground parking structures in Western Canada;
• Structural repairs of slab soffits, slab bands, walls, columns, culverts and tunnels for parking structures, transit and highway infrastructure, dams, and oil and gas infrastructure;
• Structural modification of reinforced concrete draft tube exits from the turbines in the Ice Harbor Lock and Dam located in the State of Washington, where silica fume modified steel fibre reinforced accelerated wet-mix shotcrete was applied overhead up to 6 feet thick; and
• Using low heat of hydration wet-mix shotcrete mixes designed with 70% slag and a natural cellulose fibre to construct up to 1.5 m thick, heavily reinforced perimeter station walls in six underground stations in Toronto, Canada, which incorporated the “hybrid” shoot and then vibrate shotcrete technology.
Radomski, who received his M.A.Sc. in Civil Engineering in 2005 from Ryerson University, Toronto, ON. Canada, considers himself an advocate for advancing the industry, a collaborative team approach, achieving quality through detailed review and inspection, and encouraging safe work practices.
David Rheault
David Rheault is a Senior Tunnel Engineer at Dr. Sauer & Partners with over 10 years of experience in geotechnical and tunnel engineering. During his career, David has worked on a range of underground projects throughout North America with an emphasis on delivering tailored designs and construction phase services in the transportation industry. Since joining Dr. Sauer & Partners in 2018, David has provided tunneling services from numerical analyses to site supervision and inspection. Most notably, he served as the delegate Engineer of Record for permanent structural works on the Eglinton Crosstown LRT mined stations in Toronto, with 18 m wide caverns and shotcrete final linings. More recently, he is leading the detailed design and construction supervision of shotcrete-lined cross passages on the Eglinton Crosstown West Extension. As an experienced professional engineer, David brings a breadth of practical knowledge from both the design and execution of underground projects.
Frank Townsend
Frank is the incoming ASA President and owner of Patriot Shotcrete and Constructors in the eastern United States. He is chair of both the ACI shotcrete nozzleman and shotcrete inspector certification committees. Frank’s company provides quality shotcrete placement in a wide variety of applications including the heavy civil and underground markets.