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Presentation. Expanding universal utilization of HSC in extensions Essentially in light of solidness issues; de-icing salts; solidify defrost conditions Center of this paper - direct monetary advantage Sparing in materials Diminished development profundity Lessened transport and erection cost. Diagram.

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Introduction Increasing worldwide utilization of HSC in scaffolds Mainly in light of sturdiness issues; de-icing salts; solidify defrost conditions Focus of this paper - coordinate monetary advantage Saving in materials Reduced development profundity Reduced transport and erection cost

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Overview What is High Performance Concrete? Universal utilization of HPC in scaffolds Use of HPC in Australia Economics of High Strength Concrete HSC in AS 5100 and DR 05252 Case Studies Future advancements Recommendations

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What is High Performance Concrete? " A superior cement is a solid in which certain attributes are produced for a specific application and conditions: Ease of situation Compaction without isolation Early-age quality Long term mechanical properties Permeability Durability Heat of hydration Toughness Volume solidness Long life in serious situations

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Information on H.P.C. · "Connect Views" – http://www.cement.org/spans/br_newsletter.asp · "Elite Concretes, a State-of-Art Report (1989-1994)" - http://www.tfhrc.gov/structur/hpc/hpc2/contnt.htm · "A State-of-the-Art Review of High Performance Concrete Structures Built in Canada: 1990-2000" - http://www.cement.org/spans/SOA_HPC.pdf · "Building a New Generation of Bridges: A Strategic Perspective for the Nation" - http://www.cement.org/hp/

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International Use of H.P.C. Utilized for specific applications for well more than 20 years. To begin with universal meeting in Norway in 1987 Early improvements in Northern Europe; longer traverse extensions and elevated structures. More broad utilize got to be distinctly compulsory in a few nations in the 1990's. Effectively elevated for short to medium traverse connects in N America throughout the most recent 10 years.

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International Use of H.P.C. Scandinavia Norway Climatic conditions, long coastline, N. Ocean oil HPC compulsory since 1989 Widespread utilization of lightweight solid Denmark/Sweden Great Belt extend Focus on indicated necessities France Use of HPC back to 1983 Useage for the most part in scaffolds instead of structures Joint government/industry gather, BHP 2000 70-80 MPa solid now regular in France

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International Use of H.P.C. North America HPC history more than 30 years Use of HPC in extensions effectively empowered by proprietor association/industry bunch organizations. "Lead State" program, 1996. HPC "Connect Views" pamphlet. Canadian "Focuses of Excellence" Program, 1990 " A State-of-the-Art Review of High Performance Concrete Structures Built in Canada: 1990-2000"

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Use of H.P.C. in Australia Maximum solid quality constrained to 50 MPa until the presentation of AS 5100. Utilization of HPC in extensions for the most part constrained to structures in especially forceful situations. AS 5100 raised greatest quality to 65 MPa Recently discharged draft correction to AS 3600 spreads concrete up to 100 MPa

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Economics of High Strength Concrete

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Economics of High Strength Concrete Compressive quality at exchange the most huge property, admissible strain at administration minor effect. Greatest traverses expanded up to 45 percent Use of 15.2 mm strand for higher qualities. Quality of the composite deck had little effect. HSC permitted longer traverses, less support lines, or shallower areas. Most extreme valuable qualities: I braces with 12.7 mm strand - 69 MPa I supports with 15.2 mm strand - 83 MPa U supports with 15.2 mm strand - 97 MPa

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Economics of High Strength Concrete

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AS 5100 Provisions for HSC Maximum compressive quality; 65 MPa Cl. 1.5.1 - Alternative materials allowed Cl 2.5.2 - 18 MPa weakness confine on compressive anxiety - preservationist for HSC Cl 6.11 - Part 2 - Deflection breaking points may get to be distinctly basic Cl 6.1.1 - Tensile quality - might be gotten from tests Cl 6.1.7, 6.1.8 - Creep and shrinkage arrangements moderate for HSC, however might be gotten from test.

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AS 5100 and DR 05252

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AS 5100 and DR 05252 Main Changes: Changes to the solid anxiety square parameters for extreme minute ability to take into account higher quality evaluations. · More nitty gritty computation of shrinkage and crawl misshapenings, permitting preferred standpoint to be taken of the better execution of higher quality cement · Shear quality of cement topped at Grade 65. · Minimum support prerequisites overhauled for higher quality evaluations. · Over-moderate prerequisite for least steel range in malleable zones expelled.

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Case Studies Concrete quality: 50 MPa to 100 MPa Maximum ranges for run of the mill 3 path Super-T brace connect with M1600 stacking Standard Type 1 to Type 5 supports Type 4 support changed to permit higher pre-push drive: · Increase base rib width by 200 mm (Type 4A) · Increase base spine profundity by 50 mm (Type 4B) · Increase base rib profundity by 100 mm (Type 4C)

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Case Studies · Compressive quality at exchange = 0.7f'c. · Steam curing connected (consequently strand unwinding connected at time of exchange) · Strand worried to 80% indicated rigidity. · Creep, shrinkage, and temperature worries as per AS 5100. · In-situ solid 40 MPa, 160 mm thick in all cases. · Assumed brace dividing = 2.7 m.

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Case Studies

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Case Studies - Summary · Significant funds in solid amounts and additionally development profundity. Review 65 concrete with standard supports. Review 80 concrete with changed supports and Type 1 and 2 standard braces. More significant changes to shaft cross area and technique for development required for viable utilization of Grade 100 cement.

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Future Developments Strength-weight proportion gets to be distinctly tantamount to steel:

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Future Developments

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Summary · Clear connection between's administration/industry activities and useage of HPC in the scaffold showcase. Enhanced solidness the first inspiration for HPC utilize. Ponders indicate coordinate monetary advantages. HPC use in Australia constrained by code confinements.

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Recommendations · 65 MPa to be viewed as the standard solid review for use in precast pre-tensioned scaffold braces and post tensioned extension decks. · The utilization of 80-100 MPa cement to be considered where noteworthy advantage can be appeared. · AS 5100 to be updated to permit quality evaluations up to 100 MPa as quickly as time permits. · Optimization of standard Super-T connect braces for higher quality evaluations to be examined. · Investigation of higher quality evaluations for scaffold deck sections, utilizing film activity to accomplish more noteworthy ranges or potentially decreased chunk profundity.

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Recommendations · Active advancement of the utilization of elite cement by government and industry bodies: Review of universal best practice Review and correction of particulars and models Education of fashioners, precasters and temporary workers Collect and share involvement

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