高分子抗裂密实剂对混凝土轴压力学性能的影响

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关键词：密实剂；混凝土；抗压强度；应力－应变曲线；力学性能

中图分类号：TU528 文献标志码：A 文章编号：1005-8249（2025）03-0036-08

DOI：10.19860/j.cnki.issn1005-8249.2025.03.007

Abstract：Anew typeof high molecular polymeranti-crack densifier（PRC）is used to improve theanti-crack performance of concrete.Inordertoevaluateitsinfluenceonthemechanical propertiesofconcrete，12 testgroups withtwostrengthgrades weresetup，andtheinfluenceof PRContheaxialcompresive mechanical propertiesofconcretewasanalyzed.Basedonthe experimental results，the constitutiveequationof PRC modified concretewasestablished，andthecalculation formulas for relevant parametersweregiven.Theresultsshow thattheaxialcompressivefailure characteristicsof modified concreteare basically consistent with those of ordinary concrete；the compressive strength of concrete increases by 18.8%-28.9% and the elastic modulus increases by 5.8%- 12.4% within the low dosage range as the dosage of PRC increases， and they are approximately linearly related; the proportional limit increases by about 5%-10% and is positively correlated with the dosage; thepeak straindecreasesslightlyandisnegativelycorrelatedwiththedosage；theductilitydecreasesasthedosageincreases， with a maximum reduction of 10.1% ，but it still meets the ductility requirements of ordinary concrete；the stress - strain responsecurveofPRC modifiedconcrete is basicallconsistentwiththeexperimentalresults；PRCimproves thephysicaland chemical compactness and crack resistance of concrete at the micro level.

Key words： compacting agent；concrete; compressive strength； stress - strain curve；mechanical property

0 引言

伴随建筑业高质量发展要求，结构抗渗性要求也大幅提高，在地下室底板、楼板等混凝土结构和大体量混凝土结构中，防水要求和裂缝控制要求都很高。（剩余6898字）