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Mechanical strength enhancement of lower hydraulicity cementitious solid wastes using anhydrite and pozzolanic materials
Ist Teil von
Cement and concrete research, 1999, Vol.29 (2), p.215-221
Ort / Verlag
New York, NY: Elsevier Ltd
Erscheinungsjahr
1999
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
Mechanical strength enhancement was investigated for recycling lower hydraulicity inorganic solid wastes (HISWs) from five different building material manufacturing processes. The source materials are cement-gypsum composite board, cement fiber-reinforced board, calcium silicate board, corrugated slate, and sludge from wastewater treatment plants. Mineral admixture of 80% anhydrite as an ettringite-forming agent and 20% slag/fly ash as pozzolanic materials was added by weight ratio of cement. The specimens were prepared by the press molding method or without pressure, and then cured with steam at 80 °C. The flexural strength of specimens with added HISWs did not meet the target standards for special use, regardless of source processes, addition ratio, and preparation methods without mineral admixture. The long-term mechanical strengths of compacted specimens were enhanced under 50 kgf/cm
2 pressure with the addition of 10 wt% mineral admixture due to the stimulated pozzolanic reaction by slag/fly ash and the ettringite formation by anhydrite. The increased intensity of ettringite and CSH gel peaks was detected in X-ray diffraction patterns and confirmed by scanning electron microscopic analysis. The flexural strength was increased more than 30% and was not affected by the HISWs addition ratio. The water absorption ratio also was decreased with the addition of mineral admixture.