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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

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2018 Impact Factor: 1.272

Front. Struct. Civ. Eng.    2021, Vol. 15 Issue (2) : 412-424    https://doi.org/10.1007/s11709-021-0700-5
RESEARCH ARTICLE
Crushed rocks stabilized with organosilane and lignosulfonate in pavement unbound layers: Repeated load triaxial tests
Diego Maria BARBIERI1(), Inge HOFF1, Chun-Hsing HO2
1. Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, Trondheim, Trøndelag 7491, Norway
2. Department of Civil and Environmental Engineering, Northern Arizona University, Flagstaff, AZ 86011, USA
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Abstract

The creation of the new “Ferry-Free Coastal Highway Route E39” in southwest Norway entails the production of a remarkable quantity of crushed rocks. These resources could be beneficially employed as aggregates in the unbound courses of the highway itself or other road pavements present nearby. Two innovative stabilizing agents, organosilane and lignosulfonate, can significantly enhance the key properties, namely, resilient modulus and resistance against permanent deformation, of the aggregates that are excessively weak in their natural state. The beneficial effect offered by the additives was thoroughly evaluated by performing repeated load triaxial tests. The study adopted the most common numerical models to describe these two key mechanical properties. The increase in the resilient modulus and reduction in the accumulated vertical permanent deformation show the beneficial impact of the additives. Furthermore, a finite element model was created to simulate the repeated load triaxial test by implementing nonlinear elastic and plastic constitutive relationships.

Keywords organosilane      lignosulfonate      crushed rocks      pavement unbound layers      repeated load triaxial test      finite element analysis     
Corresponding Author(s): Diego Maria BARBIERI   
Just Accepted Date: 03 March 2021   Online First Date: 16 April 2021    Issue Date: 27 May 2021
 Cite this article:   
Diego Maria BARBIERI,Inge HOFF,Chun-Hsing HO. Crushed rocks stabilized with organosilane and lignosulfonate in pavement unbound layers: Repeated load triaxial tests[J]. Front. Struct. Civ. Eng., 2021, 15(2): 412-424.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-021-0700-5
https://academic.hep.com.cn/fsce/EN/Y2021/V15/I2/412
Fig.1  RLTT specimen preparation phases.
Fig.2  Grading curves for road base layer.
Fig.3  Loading sequences and steps for the MS LSL procedure.
Fig.4  Three illustrative RLTT samples: untreated, with organosilane, with lignosulfonate.
ε ˙ performance
ε ˙<2.5 × 10−8 elastic range
2.5 × 10−8< ε ˙<1.0 × 10−7 elasto-plastic range
ε ˙>1.0 × 10−7 failure range
Tab.1  Material classification based on the development of plastic deformation
Fig.5  Mesh of the finite element method RLTT model.
Fig.6  Evaluation of Tresca plastic tangent modulus.
Fig.7  Evaluation of Von Mises plastic tangent modulus.
Fig.8  Resilient modulus based on Hicks and Monismith formulation: (a) polymer-based (P) additive; (b) lignin-based (L) additive.
Fig.9  Resilient modulus based on Uzan and Witczak formulation: (a) P additive; (b) L additive.
material Hicks and Monismith Uzan
k1,HM k2,HM k1,UZ k2,UZ k3,UZ
M2 (w= 5%) 2467 0.56 1577 1.06 –0.47
M2-P 5206 0.65 4813 0.74 –0.08
M2 (w= 1%) 2860 0.66 2216 0.92 –0.25
M2-L 4530 0.52 4881 0.45 0.06
Tab.2  Regression parameters for Hicks and Monismith, Uzan models
Fig.10  Mobilized angle of friction ρ and angle of friction at incremental failure ϕ: (a) P additive; (b) L additive.
material limit angles
ρ ϕ
M2 (w = 5%) 57.2 65.8
M2-P 64.6 67.8
M2 (w = 1%) 65.4 68.9
M2-L 64.4 70.3
Tab.3  Values of limit angles ρ and ϕ
Fig.11  Accumulated vertical permanent deformation, Barskdale model: (a) P additive; (b) L additive.
Fig.12  Accumulated vertical permanent deformation, Sweere model: (a) P additive; (b) L additive.
Fig.13  Accumulated vertical permanent deformation, Hyde model: (a) P additive; (b) L additive.
material seq 1 seq 2 seq 3 seq 4 seq 5
M2 (w = 5%) 1.74 4.60 6.60 9.23 11.18?
M2-P 0.28 1.09 1.96 3.12 4.09
M2 (w = 1%) 0.18 0.49 0.92 1.46 2.39
M2-L 0.03 0.13 0.28 0.38 0.49
Tab.4  Values of aHY for Hyde model
Fig.14  Accumulated vertical permanent deformation, Shenton model: (a) P additive; (b) L additive.
material seq 1 seq 2 seq 3 seq 4 seq 5
aSH bSH aSH bSH aSH bSH aSH bSH aSH bSH
M2 (w = 5%) 2.46E–54 1.79E2 3.13E–2 1.10E1 6.81E–1 7.24E0 1.69E0 8.90E0 4.89 E–2 1.73E1
M2-P 3.84E–65 2.14E2 6.10E–11 5.23E1 4.96E–4 2.78E1 6.48E–1 8.13E0 4.10E–3 2.18E1
M2 (w = 1%) 3.61E–29 9.20E1 5.02E–7 2.99E1 1.30E–2 1.38E1 4.07E–2 2.02E1 1.53E–4 3.09E1
M2-L 2.32E–59 1.94E2 3.36E–6 2.23E1 2.87E–2 7.23E0 1.34E–1 4.81E0 3.31E–3 1.53E1
Tab.5  Values of aSH and bSH regression parameters for Shenton model
Fig.15  Accumulated vertical permanent deformation, Tresca plasticity model: (a) P additive; (b) L additive.
Fig.16  Accumulated vertical permanent deformation, von Mises plasticity model: (a) P additive; (b) L additive.
material plastic modulus (kPa)
Tresca von Mises
M2 (w= 5%) 11323 16984
M2-P 28370 42555
M2 (w= 1%) 42566 48566
M2-L 60153 62566
Tab.6  Plastic modulus values for Tresca and von Mises models
a:apparent attraction
aBA: first regression parameter, Barksdale model
aHY: regression parameter, Hyde model
aSH: first regression parameter, Shenton model
aSW: first regression parameter, Sweere model
bBA: second regression parameter, Barksdale model
bSH: second regression parameter, Shenton model
bSW: second regression parameter, Sweere model
k1,HM: first regression parameter, Hicks and Monismith model
k1,UZ: first regression parameter, Uzan model
k2,HM: second regression parameter, Hicks and Monismith model
k2,UZ: second regression parameter, Uzan model
k3,UZ: third regression parameter, Uzan model
Log: decimal logarithm
MR: resilient modulus
N: number of load cycles
R2: coefficient of determination for goodness of fit
w: gravimetric moisture content
ε ˙: strain rate
εve: residual (or elastic or recoverable) vertical strain
εvp: permanent (or plastic or not recoverable) vertical strain
θ: bulk stress
θm: mean bulk stress
ρ: mobilized angle of friction
σ1: major principal stress
σ2: intermediate principal stress
σ3: minor principal stress
σa: reference pressure
σd: deviatoric stress
σd,m: mean deviatoric stress
σt: triaxial (or confining) stress
σy: initial yield stress
τoct: octahedral shear stress
φ: angle of friction at the incremental failure
CEN: Comité Européen de Normalisation
LA: Los Angeles (test)
LVDT: Linear variable differential transducer
MDE: micro-Deval (test)
MS HSL: Multi-stage high stress level
MS LSL: Multi-stage low stress level
NPRA: Norwegian Public Roads Administration
OMC: Optimum moisture content
RLTT: Repeated load triaxial test
SS HSL: Single-stage high stress level
SS LSL: Single-stage low stress level
UGM: Unbound granular material
  
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