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主要研究了固硫灰掺量、细度以及SO_3含量对活性粉末混凝土(RPC)早期强度和干缩性能的影响。研究结果表明,90℃蒸汽养护2d时,RPC强度随着原灰掺量的增加先增加后降低;自然养护至28d时,RPC强度出现倒缩现象。当粉磨时间超过20min时,继续延长粉磨时间RPC强度变化已不明显;当原灰掺量为胶凝材料的10%,固硫灰粉磨至D50为15.88μm时,RPC活性粉末混凝土早期干缩较小,强度较高;RPC活性粉末混凝土的早期抗压强度随着SO_3含量的增加而增加,干缩随着SO_3含量的增加而减小。
The effects of sulfur content, fineness and SO_3 content on the early strength and shrinkage properties of reactive powder concrete (RPC) were studied. The results showed that the RPC strength first increased and then decreased with the increase of the original ash content at 90 ℃ steam curing for 2 days. The RPC strength contracted after 28 days of natural conservation. When the grinding time exceeds 20min, the RPC strength change is not obvious when the grinding time continues to be extended. When the initial ash content is 10% of the cementitious material and the sulfur-fixing dust grinding to D50 is 15.88μm, the RPC activated powder concrete early The dry shrinkage is smaller and the strength is higher. The early compressive strength of RPC reactive powder concrete increases with the increase of SO 3 content, and the dry shrinkage decreases with the increase of SO 3 content.