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HCSA膨胀剂与SAP对低水胶比水泥净浆体积变形的影响

顾春平 徐艳文 韦海霞

顾春平, 徐艳文, 韦海霞. HCSA膨胀剂与SAP对低水胶比水泥净浆体积变形的影响[J]. 复合材料学报, 2024, 41(5): 2623-2632. doi: 10.13801/j.cnki.fhclxb.20230908.001
引用本文: 顾春平, 徐艳文, 韦海霞. HCSA膨胀剂与SAP对低水胶比水泥净浆体积变形的影响[J]. 复合材料学报, 2024, 41(5): 2623-2632. doi: 10.13801/j.cnki.fhclxb.20230908.001
GU Chunping, XU Yanwen, WEI Haixia. Effect of HCSA expansive agent and SAP on deformation of cement paste with low water binder ratio[J]. Acta Materiae Compositae Sinica, 2024, 41(5): 2623-2632. doi: 10.13801/j.cnki.fhclxb.20230908.001
Citation: GU Chunping, XU Yanwen, WEI Haixia. Effect of HCSA expansive agent and SAP on deformation of cement paste with low water binder ratio[J]. Acta Materiae Compositae Sinica, 2024, 41(5): 2623-2632. doi: 10.13801/j.cnki.fhclxb.20230908.001

HCSA膨胀剂与SAP对低水胶比水泥净浆体积变形的影响

doi: 10.13801/j.cnki.fhclxb.20230908.001
基金项目: 国家自然科学基金(52378272);浙江省自然科学基金(LY22E080014);浙江省重点研发计划(2021C01060)
详细信息
    通讯作者:

    顾春平,博士,副研究员,硕士生导师,研究方向为高性能水泥基材料、绿色建筑材料 E-mail: guchunping@zjut.edu.cn

  • 中图分类号: TU528;TB332

Effect of HCSA expansive agent and SAP on deformation of cement paste with low water binder ratio

Funds: National Natural Science Foundation of China (52378272); Zhejiang Provincial Natural Science Foundation of China (LY22E080014); Key Research and Development Program of Zhejiang Province (2021C01060)
  • 摘要: 为解决低水胶比下高性能硫铝酸钙(High performance calcium sulpho aluminate,HCSA)膨胀剂补偿收缩效果不显著这一问题,以高吸水树脂(Super-absorbent polymer,SAP)为内养剂,研究HCSA膨胀剂和SAP单掺、复掺对低水胶比(0.25)下水泥净浆体积变形(自收缩、干燥收缩、浸水变形)的影响,并探讨HCSA膨胀剂与SAP复掺的协同效应。结果表明:单掺HCSA膨胀剂和SAP均能降低水泥净浆的自收缩和干燥收缩、增大浸水条件下膨胀变形。密封和浸水条件下,HCSA的膨胀效果较干燥条件下时显著。复掺HCSA膨胀剂和SAP存在协同作用,SAP预吸水促进了HCSA膨胀剂效果的发挥。密封条件下,协同效应主要发生在约1天前,而后仍在缓慢发挥。浸水条件下,两者复掺也发挥一定的协同作用;干燥条件下,复掺的协同作用主要发生在7天之后,在早期SAP未能促进HCSA效能的发挥,反而使低水胶比水泥净浆干燥收缩变大。

     

  • 图  1  HCSA膨胀剂和高吸水性树脂(SAP)对水泥净浆抗压强度的影响

    Figure  1.  Effect of HCSA expansive agent and super-absorbent polymer (SAP) on compressive strength of cement pastes

    图  2  HCSA膨胀剂或SAP单掺对水泥净浆自收缩的影响:(a) 0~21天;(b) 0~1.6天

    Figure  2.  Effect of HCSA expansive agent or SAP on autogenous shrinkage of cement pastes: (a) 0-21 days; (b) 0-1.6 days

    图  3  HCSA膨胀剂和SAP复掺对水泥净浆自收缩的影响:(a) 4%HCSA;(b) 8%HCSA

    Figure  3.  Effect of HCSA expansive agent and SAP on autogenous shrinkage of cement pastes: (a) 4%HCSA; (b) 8%HCSA

    图  4  HCSA膨胀剂或SAP单掺对水泥净浆干燥收缩的影响

    Figure  4.  Effect of HCSA expansive agent or SAP on drying shrinkage of cement pastes

    图  5  HCSA膨胀剂和SAP复掺对水泥净浆干燥收缩的影响:(a) 4%HCSA;(b) 8%HCSA

    Figure  5.  Effect of HCSA expansive agent and SAP on drying shrinkage of cement pastes: (a) 4%HCSA; (b) 8%HCSA

    图  6  HCSA膨胀剂或SAP单掺对水泥净浆浸水变形的影响

    Figure  6.  Effect of HCSA expansive agent or SAP on deformation of cement pastes in water

    图  7  HCSA膨胀剂和SAP复掺对水泥净浆浸水变形的影响:(a) 4%HCSA;(b) 8%HCSA

    Figure  7.  Effect of HCSA expansive agent and SAP on deformation of cement pastes in water: (a) 4%HCSA; (b) 8%HCSA

    图  8  水泥净浆在不同环境条件下协同效应的体积增量(Δε):(a) 4%HCSA;(b) 8%HCSA

    Figure  8.  Volume increment of synergistic effect (Δε) of cement pastes under different environmental conditions:(a) 4%HCSA; (b) 8%HCSA

    表  1  水泥和高性能硫铝酸钙(HCSA)膨胀剂的主要化学组成

    Table  1.   Main chemical composition of cement and high performance calcium sulpho aluminate (HCSA)

    Compound CaO SiO2 Al2O3 MgO Fe2O3 SO3 K2O
    Cement/wt% 54.97 24.95 8.62 4.16 3.54 2.26 0.70
    HCSA/wt% 49.25 8.58 16.04 2.32 2.16 20.47 0.25
    下载: 导出CSV

    表  2  水泥的物理性能

    Table  2.   Physical properties of cement

    Specific surface
    area/(m2·kg−1)
    Water requirement of
    normal consistency/wt%
    Setting time/minFlexural strength/MPaCompressive strength/MPa
    Initial setFinal set3 d28 d3 d28 d
    33327.81452195.68.627.656.1
    下载: 导出CSV

    表  3  HCSA膨胀剂的物理性能

    Table  3.   Physical properties of HCSA expansive agent

    Alkali content
    (Na2O+0.658 K2O)/wt%
    Limit expansion rate
    in water for 7 d/%
    Setting time/minFinenessCompressive strength/MPa
    Initial setFinal setSpecific surface
    area/(m2·kg−1)
    1.18 mm
    sieving residue/%
    7 d
    0.280.056165330374026.8
    下载: 导出CSV

    表  4  水泥净浆配合比

    Table  4.   Mix proportions of cement pastes

    SampleCement/wt%HCSA/wt%Superplasticizer/wt%SAP/wt%Wi/BWe/BWt/B
    Control10000.2000.250.25
    4%HCSA 964
    8%HCSA 928
    0.04%SAP10000.040.080.17
    4%HCSA+0.04%SAP 964
    8%HCSA+0.04%SAP 928
    Notes:SAP—Superabsorbent polymer; Wi/B—Internal curing water-to-binder ratio; We/B—Free water-to-binder ratio; Wt/B—Total water-to-binder ratio.
    下载: 导出CSV
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  • 收稿日期:  2023-07-05
  • 修回日期:  2023-08-17
  • 录用日期:  2023-08-31
  • 网络出版日期:  2023-09-11
  • 刊出日期:  2024-05-01

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