Structural Portal

UndergroundStructuralDetermination of Early-Age Compressive Strength of Shotcrete

Roland Here and Dudley R. Morgan

Tere has long been a need for a reliable, simple-to-use means of determining the early-age rate of strength gain in shotcrete.During approximately the first 24 hours after shotcrete has been placed, its compressive strength is typically too low to measure using standard core-extraction and testing

StructuralInternationalShotcrete Meets the Challenge of Huge Water Project in Ecuador

Mary Jane Loevlie and Kristian Loevlie

Shotcrete Meets the Challenge of Huge Water Project in Ecuador replacing traditional œform-and-pour reinforced concrete construction methods with high-production shotcrete, the massive Trasvases Manabi Water Project in Ecuador was finished months ahead of schedule. Contractor Norberto Odebrecht, in conjunction with Shotcrete Technologies, Inc., of Idaho

UndergroundStructuralDesign Guidelines for the Use of FIber-Reinforced Shotcrete in Ground Support

F. Papworth

Developments in Shotcrete in Hobart, Tasmania, Australia in April 2001. One of the outstanding papers presented at the Conference was a paper by Grant, Ratcliffe and Papworth on œDesign Guidelines for the use of SFRS in Ground Support. Frank Papworth was asked to submit an

StructuralDealing with Reinforcing

James Warner

StructuralShotcrete Solution to Tricky Underpinning Problem

Roger W Abbott

A downtown Vancouver excavation and shoring project involving underpinning of two adjacent structures took on a strange twist when it was discovered that the three-level, early 1920s building to the north of the excava-tion had a precariously attached brick wall founded on a rubble footing,

StructuralShotcrete Retrofil of a Mechanically Stabilized Earth Wall

Roland Heere, Dudley R Morgan, Stephen Jungaro

The Municipality of Maple Ridge in British Columbia, Canada, commissioned a spe-cialty contractor to build a 9 m (29.5 ft)diameter culvert, incorporated in a mechanically stabilized earth (MSE) wall, to provide a street crossing for a stream. The culvert had been partly sunk into the

StructuralSetting the Standard with Soil Nail Technologies

Dino Kartofi lis and Gary Corwin

Nicholson Construction Company was awarded the con- tract to build a reinforced shotcrete soil nail retaining wall along State Route 9900 in Blair County, Penn-sylvania (U.S.). The 330-ft-(100-m)-long, 35-foot-(10.7-m)-high permanent retaining wall was cut into the hillside to provide an access route to the new

StructuralSoil Nailing is Designed to Fit

Marcus H. von der Hofen

Soil nailing has become a popular method to shore exca-vations and to build retaining walls due to its versatility and cost effectiveness. Generally broken into two cat-egories, temporary and permanent ground retention systems, soil nailing has evolved into many variations. A range of dif-ferent means

RepairStructuralDesigning and Installing a Shotcrete Strengthening Application on the Spokane Street Bridge

Basil Kattula and Roger Runacres

The Spokane Steet Bridge connects the community of West Seattle to downtown via Highway 99 and Interstate south of the city center. The bridge was not originally and constructed to handle is present-day usage consequently.

UndergroundStructuralInternationalShotcrete for Underground Support

Dr. Rusty Morgan

In November 1999 I had the opportunity to attend the Third International Symposium on Sprayed Concrete for Underground Support.