A study on the resilient modulus of cement-treated mixtures of RAP and aggregates using indirect tensile, triaxial and flexural tests

Fedrigo, William; Núñez, Washington Peres; López, Mario Alexander Castañeda; Kleinert, Thaís Radünz; Ceratti, Jorge Augusto Pereira

doi:10.1016/j.conbuildmat.2018.03.119

Cited by 50 publications

(15 citation statements)

References 22 publications

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“…Figure 10 shows that the modulus of resilience, E ur , increased nonlinearly with increasing confining pressure. is behavior is similar to that of unbound granular materials and cementtreated mixtures [27,28], but it differs from the linear relationship between the modulus of resilience and the confining pressure of intact completely decomposed granite soils [14].…”

Section: Modulus Of Resiliencementioning

confidence: 68%

Experimental Study on Mechanical Behavior of Lean Cemented Sand and Gravel Material in Unloading and Reloading Paths

Yang

Shan

et al. 2021

Advances in Materials Science and Engineering

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Lean cemented sand and gravel (LCSG) materials are subjected to unloading-loading when an LCSG dam is opened for water drainage and then refilled or a roadbed base is subjected to repeated wheel loads. To investigate the behavior of the LCSG materials under loading-unloading, previous studies utilized the complete loading triaxial test. In contrast, in this study, the consolidated drained triaxial tests in the unloading and reloading paths for materials with cementing agent contents of 60 and 100 kg/m3 under different confining pressures, for which each curve generates three loading-unloading cycles, were applied to investigate the unloading and reloading mechanical behavior. Experimental results indicated that the unloading and reloading behavior of the LCSG materials produced stress-strain curves exhibiting a crescent-shaped hysteresis loop, which differs from that exhibited by coarse-grained soil. Although the shape of the crescent-like hysteresis loop was preserved as stress levels increasing, it gradually expanded. Compared with that of the typical triaxial test, the cohesive force and the increasing internal friction angle increased. Further, as the confining pressure increased, the crescent-like hysteresis loops tapered, shear strength increased linearly, and the modulus of resilience increased nonlinearly; the latter’s rate of change, however, decreased. The change in volumetric strain was small during unloading as the stress level changed.

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Section: Modulus Of Resiliencementioning

confidence: 68%

Experimental Study on Mechanical Behavior of Lean Cemented Sand and Gravel Material in Unloading and Reloading Paths

Yang

Shan

et al. 2021

Advances in Materials Science and Engineering

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“…It was obtained that these existing compounds in the ashes react with the RAP binder, increasing its resistance and modifying the mastic due to its pozzolanic nature [26]. In the case of the addition of cement, an increase in the resistance and the resilient modulus was observed after performing IDT, triaxial and bending tests, which implies an increase in the rigidity of mixtures with RAP [27]. In both cases, an opposite effect to the desired one is obtained due to the limestone component of the materials added, increasing the rigidity of the mixtures with RAP.…”

Section: Introductionmentioning

confidence: 99%

The use of copper slags as an aggregate replacement in asphalt mixes with RAP: Physical–chemical and mechanical behavioural analysis

Raposeiras

Movilla-Quesada

Bilbao-Novoa

et al. 2018

Construction and Building Materials

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Copper slag (CS) is a derivative of copper production that is mainly composed of heavy metals. The large amount of this material accumulated around the world entails a serious environmental danger. Its use as a replacement of mineral aggregate in asphalt mixtures would allow to increase the durability and resistance, taking advantage of its physical-chemical properties. In this research, physicochemical analyses of different combinations of CS, reclaimed asphalt pavements (RAP), asphalt cement and aggregates by X-Ray Diffraction (XRD) and Fourier-Transform InfraRed spectroscopy (FT-IR) were developed. Subsequently, Marshall stiffness ratio, indirect tensile strength (IDT) and resilient modulus tests were performed to determine their implication in mechanical behaviour. Asphalt mixes with ranges from 45 to 55% of recycled material have improved stability, Marshall Flow and Stiffness ratio, obtaining values comparable with those from a conventional mixture. At the same time, its resilient modulus and IDT values increased by 35% compared to conventional mixes. To maintain values similar to conventional mixes, when the amount of RAP decreases the amount of CS should be increased, with a maximum value of 35%. This behaviour is explained by the presence of fayalite and magnetite in CS, which are hard, dense and hydrophobic components that produce increased elastic deformation of the binder before breaking.

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“…All results of the above studies showed that the mechanical properties of cement-treated aggregates are closely related to the aggregate properties. William Fedrigo et al [20] used indirect tensile tests, triaxial tests, and bending tests to evaluate the effects of cement content, curing time, and compressive strength on the strength and stiffness of cement-treated aggregates. e results showed that the cement content had the most significant influence on the strength and stiffness of cement-treated aggregates among the above factors.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Mesoscale Analyses of Cement Stabilized Macadam Prepared by Vibratory and Nonvibratory Mixing Techniques

Wang

Tan

2021

Advances in Civil Engineering

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The objective of this study is to analyze the effects of mixing techniques on the mechanical behavior and meso-structure of cement-treated aggregate. Different specimens were prepared by vibratory and nonvibratory mixing techniques. X-ray CT scans were performed to illustrate the distribution of cement mortar on aggregate. The strength, modulus, and fatigue tests under different stress states were tested to reveal the impacts of mixing techniques. Then, the relationships between strengths and loading rates and that between moduli and stress levels were established. Hereafter, the S-N fatigue equation that modified with stress ratio related to loading rates was used to describe the fatigue performance. The results indicate that the cement mortar of specimens prepared by vibratory mixing was well-distributed on aggregates. The strength, modulus, and fatigue life of the specimens prepared by vibratory mixing were higher under the test condition threshold. Moreover, the growth rate of strength and modulus with loading for specimens prepared by vibratory mixing was slightly larger than that for specimens prepared by nonvibratory mixing. Compared with the cement-treated aggregates specimens prepared by nonvibratory mixing, the fatigue life of cement-treated aggregates specimens prepared by vibratory mixing had more stable stress sensitivity.

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A study on the resilient modulus of cement-treated mixtures of RAP and aggregates using indirect tensile, triaxial and flexural tests

Cited by 50 publications

References 22 publications

Experimental Study on Mechanical Behavior of Lean Cemented Sand and Gravel Material in Unloading and Reloading Paths

Experimental Study on Mechanical Behavior of Lean Cemented Sand and Gravel Material in Unloading and Reloading Paths

The use of copper slags as an aggregate replacement in asphalt mixes with RAP: Physical–chemical and mechanical behavioural analysis

Mechanical and Mesoscale Analyses of Cement Stabilized Macadam Prepared by Vibratory and Nonvibratory Mixing Techniques

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