吉林大学学报(工学版) ›› 2024, Vol. 54 ›› Issue (9): 2620-2630.doi: 10.13229/j.cnki.jdxbgxb.20240015

• 交通运输工程·土木工程 • 上一篇    

水稻秸秆灰对混凝土抗压性能及微观结构的影响

王福成1(),赵欣荣2,田家冰2,解国梁2,周立明3()   

  1. 1.黑龙江八一农垦大学 工程学院，黑龙江 大庆 163319
    2.黑龙江八一农垦大学 土木水利学院，黑龙江 大庆 163319
    3.吉林大学 机械与航空航天工程学院，长春 130022
  • 收稿日期:2024-01-04 出版日期:2024-09-01 发布日期:2024-10-28
  • 通讯作者: 周立明 E-mail:fuchengwang@byau.edu.cn;lmzhou@jlu.edu.cn
  • 作者简介:王福成（1979-），男，副教授，博士.研究方向：结构工程、力学分析，混凝土材料性能分析.E-mail：fuchengwang@byau.edu.cn
  • 基金资助:
    国家自然科学基金项目(51975243);博士科研启动基金项目(XDB202205);三纵三横项目(ZRCPY202202)

Influence of rice straw ash on compressive properties and microstructure of concrete

Fu-cheng WANG1(),Xin-rong ZHAO2,Jia-bing TIAN2,Guo-liang XIE2,Li-ming ZHOU3()   

  1. 1.College of Engineering，Heilongjiang Bayi Agricultural University，Daqing 163319，China
    2.College of Civil Engineering and Water Conservancy，Heilongjiang Bayi Agricultural University，Daqing 163319，China
    3.College of Mechanical and Aerospace Engineering，Jilin University，Changchun 130022，China
  • Received:2024-01-04 Online:2024-09-01 Published:2024-10-28
  • Contact: Li-ming ZHOU E-mail:fuchengwang@byau.edu.cn;lmzhou@jlu.edu.cn

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摘要：

为探究水稻秸秆灰对普通混凝土性能的影响规律，以不同养护天数和不同取代率（0%、5%、10%、15%、20%）的水稻秸秆灰混凝土为研究对象进行受压试验，以本构关系、峰值应力、峰值应变、弹性模量、泊松比为评价指标，揭示水稻秸秆灰对混凝土性能的影响规律，提出并建立了水稻秸秆灰混凝土本构模型，利用有限元法分析水稻秸秆灰混凝土试件受压破坏形态，通过扫描电子显微镜进行微观分析，结果表明：对比普通混凝土，随着取代率的增加，养护28 d的水稻秸秆灰混凝土应力-应变曲线有明显区别，峰值应力、峰值应变均有不同程度下降；养护128 d时曲线稍有变化，峰值应力、峰值应变均有不同程度增加，取代率5%时峰值应变提高12.24%，且长期强度最好。扫描电子显微镜图像分析表明：水稻秸秆灰中的二氧化硅可与水化产物反应，促进后期强度。研究结果可为水稻秸秆灰混凝土工业化应用提供技术支持，为生物质发电厂生产的水稻秸秆灰副产物利用以促进农业循环、增加农业收入提供了理论依据。

关键词: 土木工程, 水稻秸秆灰混凝土, 本构关系, 微观分析

Abstract:

In order to explore the influence of rice straw ash on the properties of ordinary concrete， the compression test was carried out with rice straw ash concrete with different curing days and different substitution rates （0%， 5%， 10%， 15%， 20%） as the research object. Poisson's ratio is used as an evaluation index to reveal the influence of rice straw ash on the properties of concrete， a constitutive model of rice straw ash concrete is proposed and established， the compressive failure mode of rice straw ash concrete specimens is analyzed by finite element method， and the microscopic analysis is carried out by scanning electron microscope， the results show that compared with ordinary concrete， with the increase of substitution rate， the stress-strain curve of rice straw ash concrete cured for 28 days is significantly different， and the peak stress， The peak strain decreased to varying degrees， the curve changed slightly after 128 days of curing， the peak stress and peak strain increased to different degrees， and the peak strain increased by 12.24% when the substitution rate was 5%， and the long-term strength was the best. The results of this study can provide technical support for the industrial application of rice straw ash concrete， and provide a theoretical basis for the utilization of rice straw ash by-products produced by biomass power plants to promote agricultural cycle and increase agricultural income.

Key words: civil engineering, rice straw ash concrete, constitutive relation, microstructure analysis

中图分类号: 

  • TB332

表 1

水泥及水稻秸秆灰化学组成 (%)"

材料SiO2K2ONa2OCaOMgOSO3P2O5Fe2O3AI2O3Other
水泥21.08--64.591.291.89-5.685.47-
水稻秸杆灰76.8811.050.854.371.692.691.660.350.270.19

表 2

水稻秸秆灰混凝土配合比"

试件编号取代率/%C/（kg·m-3）RSA/（kg·m-3）W/（kg·m-3）S/（kg·m-3）W/BNCA/（kg·m-3）WRA/（kg·m-3）
1036001441890.43512
25342181441890.43512
310324361441890.43512
415306541441890.43512
520288721441890.43512

图1

碎石、砂子、水泥及RSA图"

图2

混凝土标准养护箱与强度拉压试验一体机图"

图3

水稻秸秆灰XRD谱图"

图4

水稻秸秆灰混凝土单轴受压应力-应变曲线（28、128 d）"

图5

峰值应力与取代率的关系"

图6

峰值应力与龄期的关系"

图7

峰值应变与取代率的关系"

图8

弹性模量与取代率的关系"

图9

水稻秸秆灰混凝土单轴受压本构关系拟合曲线"

图10

峰值应力与取代率的关系图"

图11

峰值应变与取代率的关系图"

图12

水稻秸秆灰混凝土的模型图、总变形图、屈服破坏图"

图13

水稻秸秆灰混凝土的微观形貌SEM图像（28 d）"

图14

水稻秸秆灰混凝土的微观形貌SEM图像（128 d）"

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