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        王   帥 ，丁偉祥 ，畢洋洋 ，游建華 ，楊煜明 ， 陳建東

 

         （中建三局集團（浙江） 有限公司 ，杭州 311113)

摘   要 ：為評價高分子抗裂密實劑  (PRC)   對混凝土力學性能的影響 ，設置 2 個強度等級的 12 個試驗組， 分析 PRC 對混凝土軸壓力學性能的影響 ，基于試驗結果建立 PRC 改性混凝土的本構方程 ，并給出了相關參數的  計算公式。結果表明：改性混凝土的軸壓破壞特征與普通混凝土基本一致 ；低摻量范圍內隨著 PRC 摻量增加混  凝土抗壓強度提高 18. 8%~ 28 . 9% ,  彈性模量提高 5. 8% ~ 12. 4% ,  且均近似線性相關 ； 比例極限提高約 5% ~10% ,  與摻量大小正相關 ；峰值應變略有減小 ，與摻量大小負相關 ；延性隨摻量的增加而減小 ，最大降幅為 10. 1% ,  但仍滿足普通混凝土的延性要求 ；PRC 改性混凝土的應力 －應變全曲線與試驗結果基本一致 ；PRC 在微觀層面從物理和化學形式上提升了混凝土的密實度和抗裂性能。

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

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

基金項目： 湖北省建設科技計劃項目  (JK2024003) ;  中建三局科技研發計劃  (CSCES3B2024- 8) 。

作者簡介： 王   帥  (1998—) ,   男 ，碩士 ，工程師 ，研究方向：混凝土材料與結構。

收稿日期：2024 - 10 - 31