Guidelines for the Use of Ultra-High-Performance Concrete (UHPC) in Precast and Prestressed Concrete-UHPC Guidelines Webinar Handout

UHPC Guidelines Webinar Handout

Pdf Summary

This document provides guidelines for the use of ultra-high-performance concrete (UHPC) in precast and prestressed concrete structures. The document outlines the PCI-UHPC research project, which aims to develop guidelines for the production and quality control of UHPC, demonstrate the capability of US precasters to produce UHPC using local materials and existing facilities, and develop guidelines for the structural design of precast pretensioned beams for transportation and buildings.<br /><br />The document explains that UHPC is characterized by its ultra-high compressive strength, high tensile strength, and enhanced durability. The performance of UHPC is achieved through the use of fibers, low water-cement ratio, supplemental materials like silica fume, and optimized particle packing.<br /><br />The implementation of UHPC in precast plants is discussed, including key considerations such as UHPC mixture development, production methods, and testing/qualification. It is recommended to use local materials where possible to reduce costs and tailor the UHPC mixtures to project needs. The document also provides insights into mixture development and testing, including the use of particle packing models.<br /><br />Guidelines for the production of UHPC in existing precast concrete production facilities are outlined, including recommendations for constituent materials and the mixing process. The document also addresses the topics of quality inspection, testing, and curing of UHPC.<br /><br />The UHPC Materials Guide Specification is presented, outlining the scope, terms and definitions, general requirements, and specific requirements for materials, production, and testing of UHPC. Acceptance testing, forms, storage and handling of materials, and finishing and curing are also covered.<br /><br />The document concludes by highlighting the success of the PCI-UHPC research project in demonstrating the capacity of precasters to produce UHPC products and achieving design targets. It is stated that as production matures, precasters can consistently produce UHPC meeting design requirements.<br /><br />Overall, this document provides comprehensive guidelines for the use of UHPC in precast and prestressed concrete structures, covering various aspects such as materials, mixture development, production, testing, and quality control.

Keywords

ultra-high-performance concrete

UHPC

precast concrete structures

prestressed concrete structures

PCI-UHPC research project

production guidelines

quality control

structural design

compressive strength

tensile strength