花岗岩水洗机制砂中的絮凝剂残留对泵送 混凝土拌合物性能的影响研究
Study on the influence of residual flocculants in granite washed manufactured sand on the mixture performance of pumped concrete
关键词：
水洗机制砂；絮凝剂；泵送混凝土；拌合物性能；施工性能
Key words：
Washed manufactured sand; Flocculant; Pumped concrete; Mixture performance; Construction performance
刊期：
2025年第10期
DOI：
10.19761/j.1000-4637.2025.10.032.05
文章编号：
基金项目：
作者：
朱善满1，邓宏军2，李志强1
单位：
1.保利长大海外工程有限公司，广东 广州 510620；2.广东惠增高速公路有限公司， 广东 惠州 516100
摘要
摘 要：为了解决水洗机制砂中絮凝剂残留对泵送混凝土拌合物性能的影响，通过在泵送混凝土中外掺聚丙烯酰胺类絮凝剂，模拟研究了花岗岩水洗机制砂中的絮凝剂残留量（0、0.5、1.0、5.0、10.0、50.0、100.0 mg/L）对泵送混凝土拌合物性能的影响规律。结果表明：随着絮凝剂残留量的增加，混凝土拌合物的坍落度、扩展度、离析率和含气量均呈降低趋势，排空时间、扩展时间和表观密度均呈增大趋势，泌水率呈先增大后减小的趋势；在泵送混凝土生产质量控制中，应加强对水洗机制砂中絮凝剂残留量的控制，以确保泵送混凝土的拌合物性能满足施工要求。
Abstract: In order to address the impact of residual flocculants in washed manufactured sand on the mixture performance of pumped concrete, polyacrylamide flocculants were added to the pumped concrete to simulate the effect of residual amount of flocculant (0, 0.5, 1.0, 5.0, 10.0, 50.0, 100.0 mg/L) in granite washed manufactured sand on the mixture performance of pumped concrete. The results show that as the residual amount of flocculant increases, the slump, slump-flow, segregation rate, and air content of the concrete mixture all show a decreasing trend, the emptying time, slump-flow time, and apparent density all show an increasing trend, and the bleeding rate shows a trend of first increasing and then decreasing. In the quality control of pumped concrete production, it is necessary to strengthen the control of the residual amount of flocculant in the washed manufactured sand to ensure that the mixture performance of pumped concrete meets the construction requirements.
结论
（1）随着絮凝剂残留量的增加，混凝土拌合物的坍落度、扩展度、离析率和含气量均降低，排空时间、扩展时间和表观密度均增大，泌水率先增大后减小。
（2）总体而言，少量絮凝剂残留不会对泵送混凝土的流动性产生过大不利影响，反而能使水泥浆包裹骨料的特性增强，提高拌合物的黏聚性和表观密度。但是，实际工程中仍需注意控制水洗机制砂中的絮凝剂残留量，以免影响混凝土性能，降低施工效率。
参考文献
[1] 广州市人民政府办公厅.广州市人民政府办公厅关于印发广州市矿产资源总体规划(2021—2025年)的通知[J].广州市人民政府公报,2023(2):12-31.
[2] 袁建飞.广东沿海地热系统水文地球化学研究[D].武汉:中国地质大学,2013.
[3] 曹振生,赵高锦,何宏龙,等.机制砂自密实混凝土泵送性能试验研究[J].混凝土与水泥制品,2021(9):16-20.
[4] 韩照.考虑机制砂形貌的高性能混凝土设计、性能与机理研究[D].兰州:兰州理工大学,2023.
[5] 袁梓瑞.C120机制山砂混凝土超高泵送管力学性能研究[D].贵阳:贵州大学,2023.
[6] ANN N S.An experimental study on the guidelines for using higher contents of aggregate micro fines in Portland cement concrete[D].Austin:University of Texas,2000.
[7] KIM J K,LEE C S,PARK C K,et al.The fracture characteristics of crushed limestone sand concrete[J].Cement and Concrete Research,1997,27(11):1719-1729.
[8] LI H J,WANG Z,HUANG F L,et al.Impactofdif-ferentlithologicalmanufacturedsandsonhigh-speed railway box girderconcrete[J].Construction and Building Materials,2020,230:116943.
[9] SOWJANYA S,ADISESHU S.Experimental study of fly ash blended concrete with dolomitic limestone powder[J].Advances in Sustainable Construction Materials,2021,124:433-440.
[10] 郑晓冬,管志涛,李超,等.隧道花岗岩洞渣骨料在C50混凝土预制T梁中的应用研究[J].混凝土与水泥制品,2020(12):40-44,49.
[11] 国家市场监督管理总局,国家标准化管理委员会.建设用砂:GB/T 14684—2022[S].北京:中国标准出版社,2022.
[12] KHAZAIE A,MAZARJI M,SAMALI B,et al.A Review on coagulation/flocculation in dewatering of coal slurry [J].Water,2022,14(6):918.
[13] ZHAN Y,WANG Y,DONG B.Progress and research of organic polymeric flocculant in water treatment[J].Advanced Materials Research,2012,347-353:707-710.
[14] EL-CHABIB H,NEHDI M,SONEBI M.Artificial intelligence model for flowable concrete mixtures used in underwater construction and repair[J].ACI Materials Journal,2003,100(2):165-173.
[15] GRZESZCZYK S,JUROWSKI K,BOSOWSKA K,et al.The role of nanoparticles in decreased washout of underwater concrete[J].Construction and Building Materials,2019,203:670-678.
[16] ZHANG Z Z,JI Y S,MA Z G,et al.Effect of polyacrylamide on rheological properties of underwater non-dispersible paste of alkali-activated slag[J].Ksce Journal of Civil Engineering,2021,26:236-247.
[17] BESSAIES-BEY H,BAUMANN R,SCHMITZ M,et al.Effect of polyacrylamide on rheology of fresh cement pastes[J].Cement and Concrete Research,2015,76:98-106.
[18] NEGRO C,S?魣NCHEZ L M,FUENTE H,et al.Effects of flocculants and sizing agents on bending strength of fiber cement composites[J].Cement and Concrete Research,2005,35(11):2104-2109.
[19] NEGRO C,BLANCO A,FUENTE E,et al.Influence of flocculant molecular weight and anionic charge on flocculation behaviour and on the manufacture of fibre cement composites by the Hatschek process[J].Cement and Concrete Research,2005,35(11):2095-2103.
引用本文
朱善满,邓宏军,李志强.花岗岩水洗机制砂中的絮凝剂残留对泵送混凝土拌合物性能的影响研究[J].混凝土与水泥制品,2025(10):32-36.
ZHU S M,DENG H J,LI Z Q.Study on the influence of residual flocculants in granite washed manufactured sand on the mixture performance of pumped concrete[J].China Concrete and Cement Products,2025(10):32-36.
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