Laboratory Studies to Examine the Properties of a Novel Cold-Asphalt Concrete Binder Course Mixture Containing Binary Blended Cementitious Filler

Dulaimi, Anmar; Nageim, Hassan Al; Ruddock, Felicite; Seton, Linda

doi:10.1061/(asce)mt.1943-5533.0001975

Cited by 32 publications

(12 citation statements)

References 30 publications

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“…The specimens were kept in the mould for 24 hours at room temperature. Following this, the slabs were cured for 14 days, inside a ventilated oven at 40°C, to achieve full curing [37]. For the test, a single wheel with a standard vehicle tyre pressure of 0.7MPa, was applied to the surface of the bituminous slab as shown in Figure 3…”

Section: Indirect Tensile Stiffness Modulus (Itsm) Testmentioning

confidence: 99%

A laboratory study of high-performance cold mix asphalt mixtures reinforced with natural and synthetic fibres

Shanbara

Ruddock

Atherton

2018

Construction and Building Materials

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This research aims to examine the impact of using natural and synthetic fibres as reinforcing materials, on the mechanical properties and water susceptibility of cold mix asphalt (CMA) including indirect tensile stiffness and resistance to rutting, cracking and moisture damage. Four different types of fibres were used: glass as a synthetic fibre, and hemp, jute and coir as natural fibres. Various samples of CMA, with and without fibres, were fabricated and tested. Traditional hot mix asphalt (HMA) was also used for comparison. The results indicate a significant improvement in the indirect tensile stiffness modulus, for all fibre-reinforced CMA mixtures, over different curing times. The improved tensile behaviour represents a substantial contribution towards slowing crack propagation in bituminous mixtures, while scanning electron microscopy analysis confirmed the fibre shape and surface roughness characteristics. The improved performance of the reinforced mixtures with both natural and synthetic fibres, facilitated a substantially lower permanent deformation than traditional hot and cold mixtures at two different temperatures (45 and 60°C). When using glass and hemp fibres as reinforcing materials, there was 2 a significant improvement in CMA in terms of water sensitivity. Resistance to surface cracking was also improved when fibres were incorporated. Based on the test results, 0.35% fibre content by mass of dry aggregate and 14mm fibre length are recommended to achieve the optimum performance output for indirect tensile stiffness.

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Section: Indirect Tensile Stiffness Modulus (Itsm) Testmentioning

confidence: 99%

A laboratory study of high-performance cold mix asphalt mixtures reinforced with natural and synthetic fibres

Shanbara

Ruddock

Atherton

2018

Construction and Building Materials

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“…The laboratory wheel track test was used for the asphalt mixtures to assess resistance to rutting of hot and cold mix asphalt mixtures [34,35], following the European Committee for Standardization, part 22 [36]. This test is used to validate the model results in terms of rut depth and deformation shape (Figure 3c).…”

Section: Wheel Track Testmentioning

confidence: 99%

“…The specimens then were kept in the mould for 24 hours at room temperature (20°C). Following this, the slabs were cured for 14 days, inside a ventilated oven at 40°C, to achieve full curing [34]. This curing temperature is significant as it needs to be less than the bitumen softening point (50°C) and thus prevent the bitumen from ageing [34].…”

Section: Wheel Track Testmentioning

confidence: 99%

“…Following this, the slabs were cured for 14 days, inside a ventilated oven at 40°C, to achieve full curing [34]. This curing temperature is significant as it needs to be less than the bitumen softening point (50°C) and thus prevent the bitumen from ageing [34]. Slab specimens were tested to measure rut depth in both the reinforced and conventional cold mix asphalts (close-graded surface course).…”

Section: Wheel Track Testmentioning

confidence: 99%

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Predicting the rutting behaviour of natural fibre-reinforced cold mix asphalt using the finite element method

Shanbara

Ruddock

Atherton

2018

Construction and Building Materials

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This paper describes the development of a three-dimensional (3-D), finite element model (FEM) of flexible pavements made with cold mix asphalt (CMA), which has itself been reinforced with two different natural fibres: jute and coir. A 3-D finite element model was employed to predict the viscoelastic response of flexible CMA pavements when subjected to multiple axle loads, different bituminous material properties, tire speeds and temperatures. The analysis was conducted by the finite element computer package ABAQUS/STANDARD. The pavements were subject to cyclic and static loading conditions to test for permanent deformation (rutting). The accuracy of the developed model was validated by comparing the predicted results with those measured in the lab. Reinforced and unreinforced CMA mixture models were simulated in this research. The results indicate that the CMA mixtures reinforced with natural fibres, are effective in mitigating permanent deformation (rutting). These reinforcing materials can extend the service life of flexible pavements.

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“…Due to the age of the structure, about 47 years old, chloride maybe has been included in the mix design. 'Calcium chloride was used as an accelerating admixture in concrete up until the mid-1970s' [23]. Once chlorides are present within the concrete, it will start to decrease the natural pH of the concrete.…”

Section: Block (Mm)mentioning

confidence: 99%

Using Non-Destructive Tests for Evaluating Flyover Footbridge: Case Study

Shubbar¹,

Al-Khafaji

Nasr³

et al. 2020

Kbes

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The concrete structures deterioration in the last few decades required effective methods for evaluating and maintaining the structure condition. Currently, assessing the performance and safety of reinforced concrete (RC) structures relies on routine-based visual inspection (VI). However, there are another non-destructive test (NDT) technique that can provide a more accurate assessment of the structures. Thus, in this study, a footbridge located in Liverpool, UK is chosen as a case study and has NDT techniques used for assessment. The main objective of this research is to determine the condition of structural bridge components and investigate its level of defect and deterioration using non-destructive tests. The methodologies involved are visual inspection, and NDT techniques include the rebound hammer, cover meter, Moisture Content & Depth of Carbonation Testing, Chloride Testing and Half Cell Test. The framework, when implemented with the best selection of NDT techniques, helps in determining the level of defect and deterioration of the structural bridge components and next recommendation regarding the condition of the bridge. The involved bridge structural components include column, deck, wall and staircase. Findings from the visual inspection show that there were many defects and deteriorations found at the structural bridge components, which includes crack, spalling, and delamination and rusting. Further, NDT techniques that were carried out at the selected bridge structural part shows that some of the components exhibited a moderate risk of corrosion and acceptable concrete surface quality. In general, further maintenance is needed specifically to some critical structural components of the bridge.

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Laboratory Studies to Examine the Properties of a Novel Cold-Asphalt Concrete Binder Course Mixture Containing Binary Blended Cementitious Filler

Cited by 32 publications

References 30 publications

A laboratory study of high-performance cold mix asphalt mixtures reinforced with natural and synthetic fibres

A laboratory study of high-performance cold mix asphalt mixtures reinforced with natural and synthetic fibres

Predicting the rutting behaviour of natural fibre-reinforced cold mix asphalt using the finite element method

Using Non-Destructive Tests for Evaluating Flyover Footbridge: Case Study

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