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Theoretical model of drying shrinkage behavior of recycled coarse aggregate concrete

CHOI Donguk ENKHBOLD Odontuya YANG Sungchul

再生粗骨料混凝土干燥收缩特性理论模型[J]. 交通运输工程学报, 2022, 22(5): 73-84. doi: 10.19818/j.cnki.1671-1637.2022.05.003
引用本文: 再生粗骨料混凝土干燥收缩特性理论模型[J]. 交通运输工程学报, 2022, 22(5): 73-84. doi: 10.19818/j.cnki.1671-1637.2022.05.003
CHOI Donguk, ENKHBOLD Odontuya, YANG Sungchul. Theoretical model of drying shrinkage behavior of recycled coarse aggregate concrete[J]. Journal of Traffic and Transportation Engineering, 2022, 22(5): 73-84. doi: 10.19818/j.cnki.1671-1637.2022.05.003
Citation: CHOI Donguk, ENKHBOLD Odontuya, YANG Sungchul. Theoretical model of drying shrinkage behavior of recycled coarse aggregate concrete[J]. Journal of Traffic and Transportation Engineering, 2022, 22(5): 73-84. doi: 10.19818/j.cnki.1671-1637.2022.05.003

再生粗骨料混凝土干燥收缩特性理论模型

doi: 10.19818/j.cnki.1671-1637.2022.05.003
基金项目: 

National Research Foundation of Korea 2021K1A3A1A200017221112582071420101

详细信息
    作者简介:

    :CHOI Donguk(1956-), 男,韩国首尔人,国立韩京大学教授,工学博士,从事桥面铺装性能研究

  • 中图分类号: U444

Theoretical model of drying shrinkage behavior of recycled coarse aggregate concrete

Funds: 

National Research Foundation of Korea 2021K1A3A1A200017221112582071420101

More Information
  • 摘要: 为研究再生粗骨料混凝土的干燥收缩特性,收集了现有12项研究与32组收缩数据并进行了比较,试验时间跨度为41~480 d,分析参数包括水灰比(0.36~0.68)、普通混凝土抗压强度(27~60 MPa)、再生粗骨料替换率(20%~100%)、相对湿度(43%~65%)、湿养护时间(1~28 d)和测量收缩的时间(41~480 d);通过比较试验数据和理论预测结果,利用基于天然骨料混凝土干燥收缩试验数据的多个统计指标,评估了现有ACI 209R-92模型、Bazant-Baweja B3模型以及FIB MC2010模型;采用基于Fathifazl等研究的方法来评估混凝土的干燥收缩增量;通过上述选定模型来评估再生粗骨料混凝土的干燥收缩率的增量,并使用评价残差、欧洲国际混凝土委员会(CEB)变异系数、CEB均方差与CEB偏差等统计指标评价了试验数据。研究结果表明:当将已知收缩行为的天然骨料混凝土的部分或全部粗骨料替换为已知残留砂浆含量的再生粗骨料,可以最准确地预测总收缩的演变;通过将残余砂浆系数应用于天然骨料混凝土的实测收缩量,可以相对准确地预测再生骨料混凝土的收缩;当再生粗骨料混凝土的替代率为20%~33%时,残余砂浆系数为1.03~1.08,当再生粗骨料混凝土的替代率为50%时,残余砂浆系数为1.07~1.16,即再生骨料混凝土的干燥收缩率比天然骨料混凝土的干燥收缩率增加了约16%或更小;当再生粗骨料混凝土的替代率为100%时,残余砂浆系数为1.18~1.76;当天然骨料混凝土的替代率大于50%时,再生粗骨料混凝土的干燥收缩率的增加相比天然骨料混凝土的干燥收缩率的增加更明显。由此可见,当前的研究方法可用于利用扩展的数据库进一步改进再生粗骨料混凝土干燥收缩行为的理论预测。

     

  • Figure  1.  Predicted vs. observed shrinkage strains

    Figure  2.  Predicted shrinkage by ACI 209 times SRM vs. RAC test data

    Figure  3.  Predicted shrinkage by MC2010 times SRM vs. RAC test data

    Figure  4.  Predicted shrinkages by B3 times SRM vs. RAC test data

    Table  1.   Summary of shrinkage research collected for this study

    Data Batch w/c RCA -absorption, density, RMC Hardened concrete Replacement ratio of RCA/% Shrinkage SRM
    fcm28/MPa E/GPa Measured period(started, RH)
    Domingo[9] Replacement ratios of RCAs are 20%, 50%, 100% 0.50 4/8 mm-5.19%, 2 460 kg·m-3, 31.5%
    8/20 mm- 5.19%, 2 460 kg·m-3, 18.0%
    47.4 32.4 20 252 d (7 d, 23 ℃, 65%) 1.03
    1.09
    1.20
    47.3 33.5 50
    54.8 30.3 100
    Duan[11] C30-RA1, RA2, RA3 0.68 RA1 (5/10 mm)-3.13%, 2 540 kg·m-3, 14.3%
    RA1 (10/20 mm)-3.47%, 2 450 kg·m-3, 24.3%
    RA2 (5/10 mm)-7.09%, 2 350 kg·m-3, 37.2%
    RA2 (10/20 mm)-5.66%, 2 370 kg·m-3, 34.0%
    RA3 (5/10 mm)-7.77%, 2 370 kg·m-3, 63.8%
    RA3 (10/20 mm)-5.77%, 2 360 kg·m-3, 61.1%
    27.7-35.0 24.5-28.9 100 112 d (28 d, 23 ℃, 55%) 1.34-1.76
    C45-RA1, RA2, RA3 0.51 42.0-47.6 24.6-29.4 100 1.35-1.78
    C60-RA1, RA2, RA3 0.44 53.2-60.0 29.5-34.8 100 1.32-1.70
    Fathifazl[10] CM, CV 0.45 RCA-M, 5.4%, 2 420 kg·m-3, 41%
    RCA-V, 3.3%, 2 500 kg·m-3, 23%
    43.9-45.9 100 224 d (28 d, 23 ℃, 50%) 1.18-1.30
    EM 41.4 64 1.26
    EV 44.8 74 1.17
    He[15] RCA30 0.40 RCA30, 6.43%, 2 281 kg·m-3, 48.2%
    RCA80, 4.75%, 2 386 kg·m-3, 41.3%
    33.0 23.5 100 180 d (7 d, 20 ℃, 60%) 1.69
    RCA80 42.0 29.0 100 1.54
    Zhang[16] RAC-C50 0.45 5.1%, 2 795 kg·m-3, 40.0% 47.9 30.5 50 480 d (28 d, 20 ℃, 60%) 1.16
    RAC-C100 44.0 26.3 100 1.46
    Gholampur[12] NC-40 0.50 RCA-40, 5.9%, 2 240 kg·m-3, 48% 32.0 26.7 100 450 d (3 d, 23 ℃, 60%) 1.19
    Chinzorigt-1[13] RAC-50, CRAC-50
    RAC-100, CRAC-100
    0.50 RA, 3.84%, 2 430 kg·m-3, 24.2%
    CRA, 3.14%, 2 490 kg·m-3, 24.2%
    27.0-33.1 23.6-25.4 50 180 d (1 d, 20 ℃, 60%) 1.07
    27.5-34.4 23.8-25.2 100 1.19
    Chinzorigt-2[14] RC-100 0.50 RCA, 3.84%, 2 430 kg·m-3, 24.2% 33.8 26.4 100 300 d (1 d, 20 ℃, 60%) 1.18
    Yang-1[26] Mix series 0.38 RCA (5/32 mm), 4.45%, 2 350 kg·m-3, 35.5% 40.2 25.2 50 105 d (7 d, 20 ℃, 50%) 1.16
    Yang-2[27] Replacement ratio of RCA is 40% 0.41 RCA (5/25 mm), 4.51%, 2 490 kg·m-3, 32.0% 43.9 20.3 40 41 d (7 d, 20 ℃, 60%) 1.08
    Yang-3[28] Replacement ratios of RCAs are 68%, 33% 0.39 RCA (5/20 mm), 4.53%, 2 480 kg·m-3, 40.1% 41.9, 48.1 24.8, 25.8 68, 33 54 d (7 d, 20 ℃, 43%) 1.18
    1.08
    Yang-4[29] Replacement ratios of RCAs are 25%, 50% 0.36 RP (5/20 mm), 2.62%, 2 600 kg·m-3, 20.0% 31.6, 30.8 27.7, 26.3 25, 50 145 d (7 d, 20 ℃, 60%) 1.03
    1.07
    下载: 导出CSV

    Table  2.   Summary and rating of theoretical models for shrinkage strain of NAC (number of data point is 164)

    Indicator ACI 209 fib MC2010 B3
    Residuals Positive/% 47.0 50.6 32.7
    Negative/% 53.0 49.4 67.3
    Rating 2 1 3
    CEB COV VCEB 0.311 0.391 0.445
    Rating 1 2 3
    CEB MSE FCEB/% 65.4 53.1 39.7
    Rating 3 2 1
    CEB mean deviation MCEB 1.150 1.150 0.785
    Rating 1 1 3
    Total rating 7 6 10
    下载: 导出CSV

    Table  3.   Comparison between predicted shrinkage strains vs. test data

    Indicator NAC data times SRM vs. RAC data Shrinkage data from ACI 209 times SRM vs. RAC data Shrinkage data from MC 2010 times SRMvs. RAC data Shrinkage data from B3 times SRM vs. RAC data
    Residuals Positive/% 77.8 67.4 62.4 45.5
    Negative/% 22.2 32.6 37.6 54.5
    Rating 4 3 2 1
    CEB COV VCEB 0.228 0.371 0.580 0.363
    Rating 1 3 4 2
    CEB MSE FCEB/% 28.4 73.0 80.2 33.8
    Rating 1 3 4 2
    CEB mean deviation MCEB 1.141 1.411 1.469 0.930
    Rating 2 3 4 1
    Total rating 8 12 14 6
    下载: 导出CSV
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  • 收稿日期:  2022-04-10
  • 刊出日期:  2022-10-25

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