Quality, Setting and Hardening Properties of Rapid Set Accelerators

숏크리트용 급결제의 품질, 응결 및 경화특성

  • 김진철 (한국도로공사 도로연구소 재료ㆍ환경 연구실) ;
  • 류종현 (한국도로공사 도로연구소 재료ㆍ환경 연구실) ;
  • 안태송 (한국도로공사 도로연구소 재료ㆍ환경 연구실)
  • Published : 2002.05.01

Abstract

Rapid set accelerators are widely used in tunnel construction, however quality criteria of and dosage are not well established. The density and solid content of admixtures, setting time and compressive strength of paste and mortar with admixtures were investigated to establish the quality criteria. While the early strength of mortar with sodium-silicate, sodium-aluminate and calcium aluminate type admixtures that have high alkali content are very high, but long-term strength are low. Aggregates of shotcrete has to be carefully selected. Sodium-silicate type admixture need longer setting time than the others.

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