SAP内养护对高石粉机制砂制备C50混凝土的影响

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中图分类号：TU528 文献标志码：A 文章编号：2095-2945（2026）01-0059-07

Abstract：Theeffctsofdiffrent SAPcontent ontheworking performance，compressivestrength，shrinkageand crack resistance of sand C5O concrete with 25% stone powder content were studied，and the relationship between shrinkage rate and mass loss rate was explored. The results show that： when the SAP content is 0.2% ，the working performance of concrete can be improved; when the SAP content is increased to 0.5% ，the working performance range of concrete decreases，and the loss of working performance of concrete cured with SAP at 1h increases. When SAP content is 0.2% ，the compressive strength of concreteisincreased，thedryingshrinkageisreduced，andtheearlycrackingresistanceofconcreteisimproved.WhentheSAP content is increased to 0.5% ，the compressive strength of concrete is greatly reduced，the shrinkage is increased，and the early crackingisacceleratedTheshinkagerateandmasslossrateofconcretecanbefitedbyqadaticpolyomial，butthefunction relations obtained under different SAP content are different.

Keywords：stone powder content; internal maintenance; compressve strength；drying shrinkage;crack resistance

云南省机制砂石粉含量较高，大量研究表明，随着石粉含量的增加，混凝土强度往往呈现出先增大后降低的规律[1-2]。（剩余7688字）