Gunite and shotcrete pdf files

Gunite and shotcrete services ltd specialise in the planning, managing and delivering of high end, design led projects utilising shotcrete and gunite construction methods for civil engineering and urban regeneration contracts. These same procedures could also be used for waterproofing of cast. C1436 standard specification for materials for shotcrete. The minimum standard for materials, properties, testing, and application are covered. The shotcrete is qualitycontrolled and premixed to meet engineering and structural requirements. Introduction to shotcrete applications ced engineering. Here are some relevant quotes from an expert on both pools and shotcrete. And this especially due to the type and quality of cement. The air needed to transport the concrete is at least four to six times greater than that needed for the wet gun system. It results in cost reduction taken per square foot by at 6 to 10 times as it shown on table below.

Mar 24, 2014 wet mix shotcrete, as a result, may experience significantly more cracking problems due to the excess water and drying shrinkage. Gssl gunite and shotcrete services limited specialise in both wet spray and dry spray applications of sprayed concrete, together with refractory lining installation. Shotcrete is a wet mix system with minimal additional water requirements. Gunite is a trademarked name that is incorrectly used to describe the drymix shotcrete process shotcrete emerged as the only acceptable industry term to correctly describe pneumatically applied concrete. Domed structures with concrete ceilings benefit from using both gunite and shotcrete. American concrete institutes aci guide to shotcrete defines shotcrete as concrete or sometimes mortar conveyed through a hose and pneumatically. Jul 06, 20 shotcrete is today an allinclusive term that describes spraying concrete or mortar with either a dry or wet mix process. There are many misnomers and a lot misinformation regarding these materials, and the largest cause for this is a lack of knowledge about the materials. Gunite shotcrete africa sprayed concrete specialists. Shotcretegunite an efficient and costeffective method to apply concrete and mortar for repair and new construction. Comparative cost of shotcrete per square foot application of kalmatron admixtures to shotcrete and plaster mixes replaces, substitutes, and eliminates the list of products dedicated to provide targeted certain function. Shotcrete is the process of placing concrete to achieve high strengths and low permeability.

In some areas gunite has been used to denote smallaggregate shotcrete and mortar mixtures, and shotcrete to denote largeaggregate mixtures. Dry gun equipment is totally different from the wet gun. Gunite 7000 micro silica modified shotcrete add potable water to gunite 7000 at a maximum rate of 10% water 123 fluid ounces per 80 lb bag by weight to gunite 7000. Shotcrete design and installation compliance testing. Concrete pools can be made of either shotcrete or gunite. This specification covers the materials for use in hydrauliccement concrete mixtures to be placed by wetmix and drymix shotcreting. If very thin linings or coatings are required to be applied on a. A common application for the xypex coating system is the waterproofing of shotcrete or gunite formed pools and fountains that will ultimately be finished with tile or plaster. Gunite and shotcrete brochure concrete industries scribd. Shotcrete concrete repairing techniques civildigital.

Jun 07, 2018 here too operator training is important, but not quite as technical for wet gunners. Reed concrete pumps shotcrete pumps and guncrete gunite machines. Following are two typical mix designs for shotcrete, one for dry process and one for wet process. It provides rapid setting or stiffening so the newly applied shotcrete can begin to support almost immediately. Contact us employment what we do building foundations. Apart from gunite and shotcrete, there are also other names for the. To receive documents or other information about occupational safety and. After completing a project, cemen tech mobile mixers allow you move on to your next job site and produce standard concrete, gunite or shotcrete without having to return to the plant to change or reload your mix.

Both models c10sl and c10hhd shotcrete machines are featured in the videos to illustrate how the machine is used to apply concrete materials by conveying with air through material. Following is the recommended procedure for waterproofing these structures using xypex coating materials. In 1998, the american shotcrete association was formed to promote the use of shotcrete by education, encouragement. The wet mixture is then sprayed in place and may be carved or troweled almost immediately. Gunite 7001pd modified shotcrete with fibers and corrosion inhibitors add potable water to gunite 7000pd at a maximum rate of 10% water 123 fluid ounces per 80 lb bag by weight to gunite 7000pd. Most facets of the shotcrete process are covered, including application procedures, equipment requirements, and responsibilities of the shotcrete crew. Workmanship issues in swimming pool wetmix shotcrete. Manual and mechanical methods are used for the wet spraying process but wet sprayed concrete. American shotcrete association article file format. Whereas, gunite refers to the drymix process, in which the dry cementitious mixture is propelled. Sep 30, 2018 gunite and shortcrete are essentially the same material, but they are applied with different processes.

Unfortunately, we occasionally run into people who have had a bad experience with gunite, most always traceable to lack of skill. The shotcrete is batched by computer, mixed in a truck, then poured into a pump allowing a safer and faster application, and less fatigue on the nozzelman. Maintenance and installation manual accuride corporation. Drymix shotcrete gunite is quite economical, can be quickly prepared and applied unlike the wetmix variety.

We are inspired to influence how the world is built. Shotcrete is a mixture of aggregate and portland cement, conveyed by compressed air to the nozzle of a spray gun, where water is added. The first steps in the development of shotcrete were taken nearly a century ago. The registered agent on file for this company is timothy l kleier and is located at 2020 eye st ste 201, bakersfield, ca 93301.

Since then, countless structures have been built, restored and reinforced using this unique concrete placing method the invention of spraying concrete and mortar onto a surface at high velocity in 1907 is credited to wellknown naturalist dr. Shotcrete, also called trademark gunite, concrete applied by spraying. Shotcrete accelerator has two main effects on shotcrete. Guniting is the most effective process of repairing concrete work that has been damaged due to inferior work or other reasons and is used for providing an impervious layer. Shotcrete is a timeproven method to quickly and costeffectively place concrete with a minimum of formwork. Shotcrete is an allinclusive term to describe the spraying of concrete or mortar that may be accomplished through either a dry or wetmix process. As a fact concrete, shotcrete production is a local business, the admixture product range may differ from one country to another. Recently, because of the relationship between the industry and the research community, developments in shotcrete have increased dramatically, and many qualities of the process have been improved. How soon after shotcrete application in a swimming pool can form materials be removed. It results in cost reduction taken per square foot by. Seismic strengthening thickening of walls, beams, columns.

Did the shotcrete subcontractor reuse the shotcrete rebound, or was the rebound hauled away as debris. Both wet and drymixture shotcrete are addressed, as well as fiberreinforced shotcrete. It is this dry mix shotcrete that is commonly called gunite, just because the applicator is gunshaped. Elite gunite and shotcrete, llc in bakersfield, ca. The refractory may be applied by wet or dry processes application of the unit. Requirements form a part of this section by this reference thereto, and shall have the same force and effect as if printed herewith in fbi. Evidently the reuse or recycling of shotcrete rebound is very common among shotcrete contractors who mainly work on residential pools. Apart from gunite and shotcrete, there are also other names for the same material like sprayed concrete, pneumatic concrete, and gun concrete etc.

Shotcrete is sprayed concrete consisting of cement, sand, and fine aggregate that is. The material component of shotcrete is essentially concrete or sometimes mortar, but the process of shotcrete application is unique. Shotcrete 03 37 the quikrete companies table 1 typical laboratory test results1 shotcrete ms shotcrete shotcrete ms with polypropylene fibers shotcrete with steel fibers compressive strength, astm c109 1 day 1500 psi 10. However, in usa the name shotcrete applies only to the one placed by the wet mix method. The difference is when the concrete mixes with the water. Gunite is a nick name for shotcrete there are 2 kinds wet mix and dry mix dry mix is mixed at the nozzole wet mix comes wet and has rocks in it among other things to make it stronger for the frost. Gunite core sample test dont know about shotcrete, but you could look for a concrete testing laboratory. Shotcreting or guniting are techniques or processes that have proven to be of immense benefit in diverse subdomains of construction such as slope protection or stabilisation, pools, tunnels, fluid tanks. Like all gunite products, gunite disc wheel hubs are designed and tested to meet stringent industry standards for quality and performance. The specification sections general conditions of contract, special conditions and division 01 genera. Scroll down or visit our video library to see the c10 gunite machine on various drymix gunite projects, including gunite pool construction and concrete repairs. Pmc552094b prepare for and apply shotcrete for installation modification history not applicable.

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. This versatility and flexibility will save you time and. With the gunite method, the dry concrete ingredients are placed into a hopper and then pushed out pneumatically through a hose to. Shotcrete is not an actual product you can purchase. Murray, in failure, distress and repair of concrete structures, 2009. Gunite and shotcrete brochure free download as pdf file. Advances in the development of the high range water reducing admixtures, pumping aids, and concrete pumping equipment since about 1960 have greatly reduced these problems, and wet mix shotcrete is now being used more frequently in repair construction. In addition, gssl provide project management services for this specialist field of civil engineering to larger companies, advice on feasibility, methodology, specification, together with the training and assessment for nozzleman. Shotcrete and gunite civil engineering construction. What is the difference between shotcrete and gunite. Additionally, workers building tunnels find sprayed concrete to offer the reinforcement necessary to keep the shaft from collapsing in on itself. These two words might not mean a great deal to the vast majority of the population, but to those in the pool building community, these are very commonplace. The other type, wet mix, is simply called shotcrete. Comparative cost of shotcrete per square foot admixtures.

Shotcrete and gunite are important terminologies associated with the domain of civil construction. This guideline can only be used for steel fibre reinforced shotcrete, and not for synthetic fibre concrete with low modulus of young e shotcrete safety. Progression of work after shotcrete application because of its role in the concrete construction industry, the american shotcrete association asa receives many questions both technical and nontechnical, from thoese interested in the shotcrete process. This specification contains the construction requirements for the application of shotcrete. The shotcrete process has been around since 1910, starting out as a proprietary process known as gunite. For structural uses, shotcrete is usually applied over a framework of reinforcing bars and steel. Cgcc installed 18 36 thick 4000 psi shotcrete over 2 cages of reinforcing steel to create the exterior and interior. Gunite and shotcrete also work well for ditches, dikes, and dams. By contrast, the shotcrete process, whether using wet or dry. Also known as shooting wire, swimming pool wire, piano wire, or any other of a dozen names you may choose to call it. Not your fathers gunite registration is requi this 1hour seminar will introduce the audience to the shotcrete process for placing concrete in a wide variety of structural and geotechnical applications. The companys filing status is listed as active and its file number is 201636310404.

Unit descriptor unit descriptor this unit of competency cover the use of the gunite shotcrete technique to apply refractory materials. Gunite and shortcrete are essentially the same material, but they are applied with different processes. In the pool industry, there are two kinds of concrete. Elite gunite and shotcrete, llc is a california domestic limitedliability company filed on december 19, 2016. Comparative cost of shotcrete per square foot admixtures to. One widely used specialty concrete is known as shotcrete. Although the term shotcrete was first used in the 1930s and officially adopted by the american concrete. Concrete is made up of 3 basic ingredients sand, cement and water. Reed an independent member of the shea family of companies 822 oaks avenue chino, california 917107008 usa 9092872100 fax. The major difference between shotcrete and its close cousin, concrete, is the placement method. Shotcrete is a system by which mortar or concrete can be placed pneumatically. Shotcrete is usually an allinclusive term for both the wetmix and drymix versions. That is why it is so critically important to use a gunite contractor such as modern method gunite that has carefully developed and retained the top artisan talent. Aci documents are available in print, by download, on cd rom, through electronic subscription, or reprint and may be obtained by contacting.

The success of the shotcrete for that application is contingent upon proper planning and supervision, plus the skill and continuous attention provided by the shotcrete applicator. Gunite is the popular trade term for drygun concrete, while shotcrete is the common term for wetgun concrete. The difference between gunite and shotcrete explained. Gunite disc wheel hubs are available in a wide range of designs to accommodate all common wheel and brake drum mounting configurations. The selection of shotcrete for a particular application should be based on knowledge, experience, and a careful study of required and achievable material performance. Shotcrete and gunite shotcrete and gunite are important terminologies associated with the domain of civil construction. Shotcrete accelerator is a noncaustic accelerator primarily used in shotcrete applications.

Sep 05, 2015 ppt on shotcrete technolgy by md amanullah 1. Pmc552094b prepare for and apply shotcrete for installation. In the early 1930s, the american railway engineering association introduced the term. Did your pbs shotcrete sub reuse the shotcrete rebound. Pdf advancements in shotcrete technology researchgate. Thats why gunite offers one of the best warranties in the industry. It is quite suitable for overhead application where wetmix shotcrete may not stick well and may sag or fall off. Mistakes in application are usually far less critical than with dry gunning in monolithic dome construction.

Aci documents are available in print, by download, on cdrom, through electronic subscription, or reprint and may be obtained by contacting. The gunite is a mixture of cement and sand, in the proportion of 1. Gunite refers only to the drymix process in which the dry cementitious mixture is blown through a hose to the nozzle, where the water is. Predampen surface to a surface saturated, dry condition with clean water for good bond.