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        王   帅 ，丁伟祥 ，毕洋洋 ，游建华 ，杨煜明 ， 陈建东

 

         （中建三局集团（浙江） 有限公司 ，杭州 311113)

摘   要 ：为评价高分子抗裂密实剂  (PRC)   对混凝土力学性能的影响 ，设置 2 个强度等级的 12 个试验组， 分析 PRC 对混凝土轴压力学性能的影响 ，基于试验结果建立 PRC 改性混凝土的本构方程 ，并给出了相关参数的  计算公式。结果表明：改性混凝土的轴压破坏特征与普通混凝土基本一致 ；低掺量范围内随着 PRC 掺量增加混  凝土抗压强度提高 18. 8%~ 28 . 9% ,  弹性模量提高 5. 8% ~ 12. 4% ,  且均近似线性相关 ； 比例极限提高约 5% ~10% ,  与掺量大小正相关 ；峰值应变略有减小 ，与掺量大小负相关 ；延性随掺量的增加而减小 ，最大降幅为 10. 1% ,  但仍满足普通混凝土的延性要求 ；PRC 改性混凝土的应力 －应变全曲线与试验结果基本一致 ；PRC 在微观层面从物理和化学形式上提升了混凝土的密实度和抗裂性能。

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

WANG Shuai, Ding Weixiang, BI Yangyang, YOU Jianhua, YANG Yuming, CHEN Jiandong

(China Construction Third Engineering Bureau Group (Zhejiang) Co., Ltd, Hangzhou 311113, China）

Abstract：A new type of high molecular polymer anti-crack densifier (PRC) is used to improve the anti-crack performance of concrete. In order to evaluate its influence on the mechanical properties of concrete, 12 test groups with two strength grades were set up, and the influence of PRC on the axial compressive mechanical properties of concrete was analyzed. Based on the experimental results, the constitutive equation of PRC modified concrete was established, and the calculation formulas for relevant parameters were given. The results show that the axial compressive failure characteristics of modified concrete are 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; the peak strain decreases slightly and is negatively correlated with the dosage; the ductility decreases as the dosage increases, with a maximum reduction of 10.1%, but it still meets the ductility requirements of ordinary concrete; the stress-strain response curve of PRC modified concrete is basically consistent with the experimental results; PRC improves the physical and chemical compactness and crack resistance of concrete at the micro level.

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

基金项目： 湖北省建设科技计划项目  (JK2024003) ;  中建三局科技研发计划  (CSCES3B2024- 8) 。

作者简介： 王   帅  (1998—) ,   男 ，硕士 ，工程师 ，研究方向：混凝土材料与结构。

收稿日期：2024 - 10 - 31