Preprufe scs waterproofing system for shotcrete guide specification. Also explore the seminar topics paper on concepts of shotcrete. Concrete slabs, 143 slab foundations, 143 forming up a slab foundation, 146 using screed joint forms, 147. Shotcrete versus conventional concrete unlike conventional concrete, which is first placed and then compacted in second operati shotcrete undergoes placement. Kim best practices guide for shotcrete nov 20 twosided forms with wooden strip on receiving surface blind wall with pvc on receiving surface how to install pvc 1. The resulting tunnel is covered with a layer of sprayed concrete or shotcrete, which is faster and easier to execute than traditional formwork. Shotcrete enhances the creativity and versatility of concrete.
Shotcrete refers to a type of concrete that is applied by spraying it through a hose at high velocity to a surface containing rods, mesh or other structural reinforcements. Introduction to shotcrete applications ced engineering. Sprayed concrete for rock support download ebook pdf. To search, enter a search term and press enter or click the magnifying glass. Most of the set accelerators used today are based on alkali. Shotcrete is a costeffective way of repairing walls when. Explore concepts of shotcrete technology with free download of seminar report and ppt in pdf and doc format. Pdf shotcrete is a cementbased mixture pneumatically projected at high velocity onto a receiving surface. Astm c 1116c 1116m08a standard specification for fiber.
Exposure classification may be specified on the drawings. American concrete institutes aci guide to shotcrete defines shotcrete as concrete or sometimes mortar conveyed through a hose and pneumatically projected at high velocity onto. Both wet and drymixture shotcrete are addressed, as well as fiberreinforced shotcrete. Pdf advancements in shotcrete technology researchgate. In the 1950s, wetmix shotcrete, the use of coarse aggregate in both processes, the rotary gun for drymix shotcrete, and more efficient concrete pumps for wetmix shotcrete were introduced.
Unlike castinplace concrete, the success in applying shotcrete is mostly dependent on the skill and experience of the shotcrete installation crew, especially the. Mix design hints for shotcrete concrete construction. Faced with significant concrete architectural concerns, features and complex shapes. Gunite is a trademarked name that is incorrectly used to. Lagerblad division of concrete structures, royal institute of technology kth, stockholm, sweden l. Dodge woodson, in concrete portable handbook, 2012. In some areas gunite has been used to denote smallaggregate shotcrete and mortar mixtures, and shotcrete to denote largeaggregate mixtures. This article discusses how shotcrete is used for concrete repairs with correct test methods and using the right shotcrete material to provide a long service life. Wetmix, or shotcrete, places readymixed concrete sometimes with reinforcing fiber added into a hopper, pumps the concrete through a hose to the nozzle. The materials, processes, quality control measures, and inspections described in this specification should be tested, monitored, or performed as applicable only by. Click here to download a brochure 38mb pdf from the american. American concrete institute adopted the term shotcrete to describe the drymix process. The theory behind this method of support, particularly useful in weaker grounds, is that if the.
Cement for sprayed concrete must always start to set extremely quickly and give high very early strength. The wetmix shotcrete process pumps fully mixed concrete. 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. Shotcrete and ground support early and longterm strength in ground support. Shoring with shotcrete concrete construction magazine. Achieve early and longterm concrete strength in ground support with basfs comprehensive products that allow. Download pdf shear walls innovation reagan library in an effort to reduce project duration and provide ve cost savings, ssi proposed and successfully installed over 15,000 sf of 1 sided. Shotcrete is today an allinclusive term that describes spraying concrete or mortar with either a dry or wet mix process. The drymix shotcrete process originally tradenamed gunite pneumatically propels concrete materials under pressure to the nozzle at the end of the hose, where water is added to the materials stream. Sprayed concrete download ebook pdf, epub, tuebl, mobi. Pursuant to sampling and testing requirements as prescribed by the ndot materials and sampling guide, contractor submits shotcrete mix.
Introduction the new austrian tunneling method, or n. Cement which does not react well when combined with. Concrete institute aci conventions, and the term shotcrete will be used throughout this guide. Concrete slabs, 143 slab foundations, 143 forming up a slab foundation, 146 using screed joint forms, 147 pouring concrete slabs, 150 small concrete pours, 151 large concrete pours, 152 finishing lightweight concrete, 154. The preferred term today for all gunned material is shotcrete, regardless of the aggregate size. Portland cement must meet the requirements of crdc. It also features several statistical tools for evaluation purposes. It is now also applied to the wetmix process and has gained universal acceptance in the united states. Shotcrete also known as sprayed concrete, or gunite is a semidry mix that is sprayed onto a surface, and is consolidated onto it by the impact, and requires no formwork. One widely used specialty concrete is known as shotcrete. Many improvements were made to wetmix equipment, primarily concrete pumps and materials, in the 1970s and 1980s.
Concepts of shotcrete technology seminar report, ppt. Various watersoluble salts of the alkali metals can be used to accelerate the setting of cement. Shotcrete sprayed concrete gunite sprayed mortar ce 3420 concrete technology prof. Click on the following to see a few examples of the different types of shotcrete finishes we offer.
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