高分子抗裂密實劑對混凝土軸壓力學性能的影響

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關鍵詞：密實劑；混凝土；抗壓強度；應力－應變曲線；力學性能

中圖分類號：TU528 文獻標志碼：A 文章編號：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

伴隨建筑業(yè)高質(zhì)量發(fā)展要求，結構抗?jié)B性要求也大幅提高，在地下室底板、樓板等混凝土結構和大體量混凝土結構中，防水要求和裂縫控制要求都很高。（剩余6898字）