Durability design of structural lightweight SCC in Taiwan

Title: Durability design of structural lightweight SCC in Taiwan
Author(s): C.-L. Hwang, M.-F. Hung, C.-H Tsai
Paper category : conference
Book title: International RILEM Symposium on Self-Compacting Concrete
Editor(s): O. Wallevik and I. Nielsson
Print-ISBN: 2-912143-42-X
e-ISBN: 2912143713
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 786 - 795
Total Pages: 10
Nb references: 9
Language: English

Abstract: Due to high water absorption capacity of lightweight aggregate (law), the workability of traditional lightweight concrete (lwc) can no be controlled as good as expected. But with modern technology, the sintered lwa with vitrified surface has low absorption capacity, and hence can be used to produce lightweight SCC by normal mixture proportion algorithm without any trouble. For durability viewpoint, the reduction of cement paste is important both on volume stability and on long-term strength development. Design SCC with minimum water and proper strength with minimum cement is crucial for durability. The densify mixture design algorithm (DMDA) with the least void within particle by packing coarse lwa, normal sand and fly ash is applied to lwc, and the flowing behavior is achieved by adding high performance superplasticizer and pozzolanic materials. In this research by DMDA, the water content is assigned to 150kg/m³?the W/B ratio is assigned to 0.28, 0.32 and 0.4, and in consequence the cement content is reduced to within 234~386kg/m³. The resulting slump and slump flow spread of fresh lwc is within 210~250mm and 400~600mm, respectively. The resulting compressive strength of lwc is within 28~63 Mpa. The durability index of electric resistance and chloride penetration of lwc is greater than 100 kO-cm and less than 1000coulombs, respectively. Such lightweight SCC as designed has good performance of high strength, high workability and high durability, and meets the construction requirement and specification

Online publication: 2003-08-21
Publication type : abstract_only
Public price (Euros): 0.00