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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2023, Vol. 57 Issue (9): 1727-1735    DOI: 10.3785/j.issn.1008-973X.2023.09.004
    
Direct shear mechanical behavior of cement stabilized road solid waste modified by fibers and nanomaterials
Wei WANG1,2(),Shuai-shuai HUANG1,Wen-jie YU3,Xu-ming CHE1,Na LI1,2,*()
1. School of Civil Engineering, Shaoxing University, Shaoxing 312000, China
2. Shaoxing Key Laboratory of Interaction between Soft Soil Foundation and Building Structure, Shaoxing 312000, China
3. Shaoxing Kezhu Expressway Limited Company, Shaoxing 312000, China
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Abstract  

To study the effect of fiber-nano materials on the shear characteristics of cement stabilized road solid waste recycled aggregates, the shear strength characteristics of cement-stabilized recycled aggregate (CA), the polypropylene fiber cement-stabilized recycled aggregates (PCA), the nano-magnesia cement-stabilized recycled aggregate (MCA), the nano-silica cement-stabilized recycled aggregate (SCA), the polypropylene fiber-nano-magnesia cement-stabilized recycled aggregate (PMCA), and the polypropylene fiber-nano-silica cement-stabilized recycled aggregate (PSCA) were evaluated and characterized by the direct shear tests. Experimental results showed that the shear stress-displacement curve of each group of the samples gradually changed from the softening to the hardening with the increase of the vertical pressure. MCA, SCA, PMCA and PSCA showed larger friction angle than CA, and the cohesion of PCA、MCA、SCA、PMCA、PSCA was greater than that of CA. A composite sine-power function (CSP) model was proposed, which was more applicable than traditional models. And the softening and the hardening stress-displacement curves were simulated effectively by the CSP model. A general formula for the stress-displacement relationship of each group of the samples was established, and the formula fitted well with the measured data.

Key words： road solid waste      recycled aggregate      fiber-nano materials      shear strength      composite sine-power function (CSP) model     
Received: 25 November 2022      Published: 16 October 2023
CLC:  TU 447  
  TU 521  
Fund:  国家自然科学基金资助项目(52179107)
Corresponding Authors: Na LI     E-mail: wellswang@usx.edu.cn;lina@usx.edu.cn
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Wei WANG
Shuai-shuai HUANG
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Na LI
Cite this article:

Wei WANG,Shuai-shuai HUANG,Wen-jie YU,Xu-ming CHE,Na LI. Direct shear mechanical behavior of cement stabilized road solid waste modified by fibers and nanomaterials. Journal of ZheJiang University (Engineering Science), 2023, 57(9): 1727-1735.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.09.004     OR     https://www.zjujournals.com/eng/Y2023/V57/I9/1727


纤维和纳米材料改性水泥稳定道路固废的直剪力学行为

为了研究纤维-纳米材料对水泥稳定道路固废再生集料抗剪特性的影响，通过直剪试验对水泥稳定再生集料(CA)、聚丙烯纤维水泥稳定再生集料(PCA)、纳米氧化镁水泥稳定再生集料(MCA)、纳米二氧化硅水泥稳定再生集料(SCA)、聚丙烯纤维-纳米氧化镁水泥稳定再生集料(PMCA)和聚丙烯纤维-纳米二氧化硅水泥稳定再生集料(PSCA)的抗剪强度特性进行评价和表征. 试验结果表明：各组试样的剪应力-位移曲线随着垂直压力的增加逐渐由软化型向硬化型转变；MCA、SCA、PMCA、PSCA的摩擦角比CA的摩擦角更大，PCA、MCA、SCA、PMCA、PSCA的黏聚力均大于CA. 提出复合正弦-幂函数(CSP)模型，该模型可以有效地模拟软化型和硬化型应力-位移曲线，比传统模型更具适用性. 建立各组试样的应力-位移关系的通用公式，该公式与实测数据拟合效果良好.


关键词： 道路固废,  再生集料,  纤维-纳米材料,  抗剪强度,  复合正弦-幂函数(CSP)模型 
Fig.1 Source of recycled aggregate from road solid waste
材料 参数 数值
道路固废再生集料 d 2.69
塑限ωp/% 10.29
液限ωL/% 18.95
塑性指数IP 8.66
液性指数IL ?1.61
最大干密度/(g·cm?3) 2.04
wwp/% 10
wm/% 33.03
聚丙烯纤维 密度/(g·cm?3) 2.6
平均长度/mm 6
直径/μm 19-49
弹性模量/GPa >3.5
抗拉强度/MPa >349
拉伸极限/% >15
熔点/℃ >145
纳米MgO 产品纯度/% 99.8
平均粒度/nm 15-20
理论密度/(g·cm?3) 3.58
纳米SiO2 产品纯度/% 99.90
平均粒度/nm 17
理论密度/(g·cm?3) 0.045
Tab.1 Basic parameters of fiber-nano material cement stabilized road solid waste test materials
Fig.2 Grain gradation of recycled aggregate from road solid waste
集料名称 wc/% ww/% wpp/% wMgO/% wSi/%
CA 10 30 0 0 0
PCA 0.6 0 0
MCA 0 1.5 0
SCA 0 0 0.2
PMCA 0.6 1.5 0
PSCA 0.6 0 0.2
Tab.2 Direct shear test program of modified road solid waste
Fig.3 Direct shear test curve of modified road solid waste sample
Fig.4 Shear strength of modified road solid waste samples under different vertical pressures
Fig.5 Increase of shear strength of modified road solid waste sample under vertical pressure of 100 kPa
集料名称 抗剪强度表达式 $c$/kPa $\varphi $/(°)
CA $\tau_{\rm{m}}= 0.66p+46.67$ 46.67 33.42
PCA $\tau_{\rm{m}} = 0.64p+74.78$ 74.78 32.62
MCA $ \tau_{\rm{m}} = 0.70p+61.58 $ 61.58 34.99
SCA $ \tau_{\rm{m}} = 0.72p+66.84 $ 66.84 35.75
PMCA $ \tau_{\rm{m}} = 0.73p+70.27 $ 70.27 36.13
PSCA $ \tau_{\rm{m}} = 0.75p+75.68 $ 75.68 36.87
Tab.3 Shear strength index of modified road solid waste sample
Fig.6 Shear stress-displacement characteristic curve
Fig.7 Typical curves of composite sine power function model with different parameters
集料名称 p/kPa a/kPa b c/kPa d R2
CA 100 115.38 2.75 0.75 0.87 0.978
200 168.55 2.89 0.36 0.79 0.998
300 246.40 3.00 0.24 0.78 0.998
400 353.11 2.10 0.23 0.75 0.999
PCA 100 134.79 2.61 0.51 1.01 0.994
200 200.09 3.01 0.29 0.82 0.997
300 267.15 6.00 0.07 0.66 0.997
400 352.33 8.58 0.04 0.70 0.999
MCA 100 134.83 2.55 0.82 1.19 0.994
200 194.31 3.17 0.31 0.89 0.997
300 272.13 4.04 0.12 0.68 0.999
400 355.98 5.76 0.07 0.77 0.999
SCA 100 130.68 2.61 1.05 1.09 0.996
200 199.03 3.11 0.36 0.88 0.998
300 277.80 2.95 0.35 1.11 0.998
400 353.75 4.46 0.12 0.90 0.999
PMCA 100 144.49 2.68 0.70 1.15 0.994
200 208.26 2.52 0.49 1.00 0.999
300 286.45 2.73 0.26 0.92 0.999
400 380.82 2.34 0.31 1.03 0.999
PSCA 100 155.21 2.66 0.67 1.13 0.988
200 209.14 3.39 0.27 0.68 0.991
300 297.23 2.67 0.39 1.09 0.998
400 385.63 3.08 0.21 1.00 0.999
Tab.4 CSP model fitting parameters of modified road solid waste samples
集料名称 关系式 集料名称 关系式
CA a=791.04p+23.1 SCA a=747.98p+53.32
b=?26p2+11.16p+1.85 b=25.25p2?7.23p+3.2
c=9.5p2?6.43p+1.29 c=11.5p2?8.55p+1.74
d=1.25p2?p+0.95 d=?0.34p+1.08
PCA a=719.68p+58.67 PMCA a=787.18p+58.21
b=54.5p2?6.35p+2.55 b=?5.75p2+2.06p+2.48
c=4.75p2?4.01p+0.87 c=6.5p^2?4.65p+1.12
d=5.75p2?3.97p+1.36 d=6.5p2?3.69p+1.46
MCA a=741.27p+54 PSCA a=779.35p+66.96
b=27.5p2?3.25p+2.63 b=?8p2+4.54p+2.42
c=11.5p2?8.19p+1.52 c=5.5p2?4.01p+0.97
d=9.75p2?6.35p+1.74 d=9p2?4.48p+1.42
Tab.5 Relationship between CSP model parameters and vertical pressure of modified road solid waste sample
Fig.8 CSP model prediction curve and measured value of modified road solid waste direct shear test
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