Durability of Soil–Cements against Fatigue Fracture

Sobhan, Khaled; Das, Braja M.

doi:10.1061/(asce)0899-1561(2007)19:1(26)

Cited by 52 publications

(12 citation statements)

References 4 publications

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“…As may be seen, Mix 1 is slightly higher which has been reported previously. One of the requirements of THL is flexibility with low shrinkage [25][26][27][28]. The results here show that the flexural strength of RoadCem concrete is slightly lower than the plain mix.…”

Section: Flexural Strengthmentioning

confidence: 58%

Structural Properties of Concrete Materials Containing RoadCem

Holmes¹

2015

Journal of Construction Engineering

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This paper presents findings from a preliminary study to assess the structural and material properties of a nonstandard, concrete type mix containing RoadCem, a traditional soil stabilising additive. Two different mixes determined the effect of adding RoadCem in terms of compressive and flexural strengths, breaking strain, thermal expansion and contraction behaviour, permeability using a falling head, and Young's modulus. RoadCem is a fine powder containing alkali metals and synthetic zeolites which are complemented with a complex activator. RoadCem modifies the dynamics and chemistry of cement hydration by enhancing the crystallisation process and forming longer needle crystalline structures. It reduces the heat of hydration with an early strength development. Varying the volume in the mix varies the viscosity and alters curing times while maintaining the water cement ratio. The results from this study have shown a modest increase in compressive strength and Young's modulus with improvements in thermal performance, particularly at low temperatures. The flexural strength of the two mixes was similar with a much reduced permeability in the RoadCem mix. The results demonstrate the improved performance of concrete incorporating RoadCem but further improvements are possible by using a better graded aggregate and controlling the maximum dry density and moisture contents.

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Section: Flexural Strengthmentioning

confidence: 58%

Structural Properties of Concrete Materials Containing RoadCem

Holmes¹

2015

Journal of Construction Engineering

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“…1) showed that the maximum aggregate size was approximately 19 mm (0.75 in. ), and the grain size distribution closely matched with the grain size curves from other regions of the country, reported in an earlier study [8]. The aggregate was classified as GW according to the Unified Soil Classification System, with coefficient of uniformity, C u = 24 and coefficient of curvature, C c = 1.5.…”

Section: Methodsmentioning

confidence: 97%

“…3. In an earlier investigation, Sobhan and Das [8] found that these constants tend to decrease with increasing stress ratios. In the current study, the average values of these constants were plotted at their respective stress ratios (Fig.…”

Section: Permanent Deformation Responsementioning

confidence: 93%

“…From a mechanistic standpoint, the semi-rigid RAC base course within the pavement structure is subjected to repeated tensile stresses due to moving traffic load, and therefore, fatigue and cyclic behavior are important considerations for the durability assessments of such materials. A number of studies are available in the literature, dealing with the flexural fatigue and damage behavior of RAC base course materials [8][9][10]. In recent years, several investigators have studied the strength, durability and fatigue behavior of new structural concrete, incorporating RCA [11][12][13][14][15], while several European studies focused on the actual application of RCA in road sections as unbound aggregate layers and cement-bound base courses [16,17].…”

Section: Mechanistic and Durability Considerationsmentioning

confidence: 99%

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Durability of a pavement foundation made from recycled aggregate concrete subjected to cyclic wet–dry exposure and fatigue loading

Sobhan

Gonzalez²,

Reddy

2015

Mater Struct

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Long term durability of recycled materials continues to be a major concern for their wide-scale use in civil engineering construction. The purpose of this study is to provide an insight into the damaging effects of combined wet-dry cycles, and repeated mechanical loading in a roller-compacted concrete pavement base course, made from recycled crushed aggregate (80 % by weight) and cement. This laboratory-based investigation was divided into three phases, each consisting of specimens subjected to prior wetdry cycles (WD specimens), and control specimens which were not exposed to wet-dry cycles (NWD specimens). Phase I experiments involved monotonic loading tests, under compression and flexure, to evaluate the strength properties. Phase II involved testing cylindrical specimens in cyclic compressive (fatigue) loading at three different stress ratios. After each regime of cyclic loading, residual compressive strengths were determined. In addition, the loaddeformation hysteresis loops, and the accumulated plastic deformation, were continuously monitored through all loading cycles. Phase III included an evaluation of flexural fatigue behavior and fatigue endurance limit of beam specimens. It was found that the specimens subjected to wet-dry cycles suffered significantly higher damage characterized by permanent deformation, residual compressive and flexural strengths, and fatigue resistance, compared to specimens not exposed to wet-dry cycles. These findings should be important design considerations when recycled products are incorporated in the pavement structure as promising alternative materials for achieving sustainable growth, environmental benefits, and possible economic savings.

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“…Dempsey and Thompson (1967) defined durability as the ability of the materials to retain their stability and integrity and to maintain adequate long-term residual strength to provide sufficient resistance to climate conditions. Cyclic wetting-drying (w-d) test, simulates weather changes over a geological age, and is considered to be one of the most appropriate simulation that can induce damage to pavement materials (Sobhan & Das, 2007).…”

Section: Introductionmentioning

confidence: 99%

Wetting and Drying Characteristics of Recycled Asphalt Pavement-Fly Ash Blend as a Sustainable Pavement Material

Hoy¹,

Horpibulsuk²,

Rachan³

et al. 2017

dtmse

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ABSTRACT:The usage of Recycled Asphalt Pavement (RAP) and Fly Ash (FA) blend in pavement applications contributes to the sustainable usage of such waste by-products. Although RAP-FA blend has been proven as a pavement material based on strength and leachate requirement, the durability of this blend when exposed to an aggressive environment has not been investigated to date. This research presents the effect of wetting-drying (w-d) cycles on the strength and microstructural changes of RAP-FA blend. The strength characteristic of this material was determined by Unconfined Compression Strength (UCS) test. The mineralogical and microstructural changes of the compound pavement material were also analyzed using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Test results show that the UCS of RAP-FA blend increases with increasing the number of w-d cycles (C), reaching its peak at 6 w-d cycles. The XRD and SEM analyses indicate that the increased UCS of RAP-FA blend is due to stimulation of the chemical reaction between the high amount of Calcium in RAP and the high amount of Silica and Alumina in FA during w-d cycles leading to production of more Calcium Silicate Hydrate (C-S-H) and Calcium Aluminate Hydrate (C-A-H). For C > 6, the significant macro-cracks due to the loss of moisture content during drying stage cause strength reduction. However, its reduced UCS is still greater than the minimum strength requirement even at C = 20. The outcome from this research confirms the viability of using RAP-FA blends as an alternative sustainable pavement material.

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Durability of Soil–Cements against Fatigue Fracture

Cited by 52 publications

References 4 publications

Structural Properties of Concrete Materials Containing RoadCem

Structural Properties of Concrete Materials Containing RoadCem

Durability of a pavement foundation made from recycled aggregate concrete subjected to cyclic wet–dry exposure and fatigue loading

Wetting and Drying Characteristics of Recycled Asphalt Pavement-Fly Ash Blend as a Sustainable Pavement Material

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