STRENGTH AND DURABILITY OF CONCRETE INCORPORATING METAKAOLIN AND FLY ASH
This paper examines the strength and durability of concrete made with ternary metakaolin(MK)-fly ash (FA)-Portland cement (PC) binders. A range of water to binder ratios wasemployed and the properties reported in this paper were compressive strength development,and chloride ingress. This paper presents strength development, particularly at early curingages, to evaluate the effectiveness of MK as an accelerating admixture. The Portland cementconcrete covering five different addition levels of MK (1％, 2％, 3％, 4％ and 5％) to binderand with water to cement ratios of 0.5 were cured in water up to 28 days. The compressivestrengths were evaluated at l, 3, 7, 14 and 28 days. The compressive strength development ofthe concrete at various curing times is compared with control concrete (PC only). It is foundthat MK contributes significantly to early strength development for PC concrete.It is found that the contrasting influences on the strength, particularly at early curing times,affected by FA and MK, when used in isolation as blends for cement, can be combinedeffectively by the employment of various compositions of MK and FA. The results establishthat improved performance can be achieved by using particular combinations of the differentbinders. Tentative guidelines for PC-MK-FA mix design are recommended.In ternary PC-FA-MK blends. MK has a significant beneficial effect on both the chlorideconcentration and the penetration depth.
Jiping Bai
Department of Engineering,University of Glamorgan,Pontypridd,CF37 1DL,UK
国际会议
南京
英文
367-374
2008-10-13（万方平台首次上网日期，不代表论文的发表时间）