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以C60混凝土为研究对象,通过单掺和复掺不同比例的粉煤灰、矿粉、偏高岭土,研究各矿物掺合料对混凝土抗压强度及体积稳定性的影响。结果表明,单掺粉煤灰和偏高岭土能有效降低混凝土试件的收缩率,其中掺加20%粉煤灰的混凝土试件,60d收缩率相比不掺加时降低了19.07%,单掺偏高岭土10%与20%时,收缩率分别降低了28.66%和30.27%,二者相差不大。复掺10%偏高岭土+20%粉煤灰时,混凝土试件的收缩率得到进一步降低,60d收缩率仅为空白样的60.02%,且28d抗压强度为63.5MPa,与空白样相比略微降低。
Taking C60 concrete as the research object, the effects of various mineral admixtures on the compressive strength and volume stability of concrete were studied by single admixing and compounding different proportions of fly ash, slag and metakaolin. The results show that the single mixed fly ash and metakaolin can effectively reduce the shrinkage rate of concrete specimens. The concrete specimens with 20% fly ash have a 19.07% reduction in shrinkage at 60 days, Metakaolin 10% and 20%, the shrinkage decreased by 28.66% and 30.27%, respectively, the difference between the two is not. When 10% metakaolin + 20% fly ash was added, the shrinkage of concrete specimens was further reduced. The 60 days contraction rate was only 60.02% of the blank, and the compressive strength at 28 days was 63.5 MPa, which was slightly lower than that of blank samples reduce.