Investigating the Effect of Modifying Aggregate Surface by Micronized Calcium Carbonate on Increasing the Moisture Resistance of Asphalt Mixtures

Sohrabi, Mohsen; Shirmohammadi, Hamid; Hamedi, Gholam Hossein

doi:10.3311/ppci.11632

Cited by 7 publications

(8 citation statements)

References 17 publications

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“…Calcium carbonate whisker is a micro-scale fiber having high aspect ratio, elastic modulus and strength and also helps in resisting the cracks at micro level [10]. Calcium carbonate whisker is used as filler in wide range of applications [11,12]. Calcium carbonate whisker has a low cost of about $200 per ton which is helpful to reduce the overall production cost of large scale construction projects [13].…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Calcium Carbonate Whisker in Cementitious Composites

Cao

Khan

Ahmed

2020

Period. Polytech. Civil Eng.

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Cementitious composites are porous material having complex structure system consist of hydration products, un-hydrated cement particles and pore solutions of various scales. Calcium carbonate whisker is a new type of low cost micro-scale filler fiber gaining popularity in the field of construction materials. However, addition of whisker has effect on physical, mechanical and microstructural characteristics of cementitious composites. Also, the low production cost of whisker will make the use of micro fiber more extensive in large scale construction projects. In this study, the effect of calcium carbonate whisker on physical, mechanical and microstructural properties of cementitious composites with different fiber contents are investigated. The fluidity, drying shrinkage, pore structure, impact resistance, compressive, flexural and splitting-tensile strength of whisker-mortar are considered. The scanning electron microscopy analysis is also performed to examine the microstructural and toughening mechanism of whisker reinforced composites.It was concluded that the addition of calcium carbonate whisker up to 10 % improves the physical and mechanical properties of cementitious composites and is suggested to be the optimize content. The calcium carbonate whisker also resists the crack propagation at micro scale and showed the toughening mechanism with better interfacial properties between whisker and matrix.

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Section: Introductionmentioning

confidence: 99%

Effectiveness of Calcium Carbonate Whisker in Cementitious Composites

Cao

Khan

Ahmed

2020

Period. Polytech. Civil Eng.

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“…Sohrabi et al [9] studied the effect of modifying aggregate surface by micronized calcium carbonate on increasing the moisture resistance of asphalt mixtures. The results obtained by mechanical methods show that modification of aggregates surface causes an increase in the tensile strength ratio (TSR) in the samples made by both two types of asphalt binder.…”

Section: Literature Reviewmentioning

confidence: 99%

Influence of Polymeric Coating the Aggregate Surface on Moisture Damage of Hot Mix Asphalt

Khodadadi

Azarhoosh

Khodaii

2020

Period. Polytech. Civil Eng.

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Moisture damage is one of the common causes of asphalt pavement failure in moisture presence. One of the convenient approaches to decreasing moisture sensitivity in hot-mix asphalt is coating the aggregate surface with a suitable agent. In this study, the effects of polyethylene terephthalate on moisture damage of asphalt mixtures were evaluated by applying indirect tensile strength and resilient modulus tests. The asphalt specimens were prepared with two types of aggregates (granite and limestone) and neat asphalt binder of 60/70 penetration grade. The results showed that the ratio of wet/dry values of indirect tensile strength and resilient modulus for mixtures containing limestone was higher than those of the samples with granite aggregate. Furthermore, the results of the laboratory tests indicate that polyethylene terephthalate improves resistance to moisture susceptibility. Because polyethylene terephthalate increases the wettability of asphalt binder over the aggregate and the adhesion between the asphalt binder and aggregate, especially in the mixtures containing acidic (granite) aggregate prone to moisture damage.

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“…e main reason for asphalt binder modification is the reduction of the acidic properties and the increase in the nonpolar properties of asphalt binder, which will result in improved adhesion in the asphalt system. Moreover, the reason for modifying aggregates with nanomaterials is to be able to reduce the hydrophilicity of aggregates [29,30].…”

Section: Introductionmentioning

confidence: 99%

Improving the Moisture Sensitivity of Asphalt Mixtures by Simultaneous Modification of Asphalt Binder and Aggregates with Carbon Nanofiber and Carbon Nanotube

Nikookar

Movahhed

Ayoubinejad

et al. 2021

Advances in Civil Engineering

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Moisture sensitivity of asphalt mixtures may cause damage due to cohesion in asphalt binder membrane and adhesion between aggregate and asphalt binder that result in considerable damage to the pavements. Therefore, by determining the adhesion quality in a modified aggregate-asphalt binder system, one can choose the suitable material compositions to decrease the moisture sensitivity of mixtures. In this study, the effects of modified asphalt binder with carbon nanofiber and modified aggregates with carbon nanotube on the moisture sensitivity of asphalt mixtures were simultaneously explored. For investigating the moisture sensitivity, the indirect tensile strength test and surface free energy concept were implemented. The results of the indirect tensile strength test revealed that modification of asphalt binder and aggregates with carbon nanofiber and carbon nanotube, respectively, increased the indirect tensile strength and tensile strength ratio values of mixtures. The results of surface free energy indicated that using carbon nanofiber and carbon nanotube enhanced the adhesion free energy of the aggregate-asphalt binder system. Moreover, utilizing carbon nanofiber to modify asphalt binder enhanced the cohesion free energy values in the asphalt binder membrane. Also, carbon nanofiber and carbon nanotube brought detachment energy of the system toward zero, indicating less desire for the mixtures to be stripped. Generally, investigations performed by the two methods showed that covering aggregates by carbon nanotube as well as utilizing carbon nanofiber as an asphalt binder modifier had a positive impact on decreasing moisture sensitivity of asphalt mixtures.

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Investigating the Effect of Modifying Aggregate Surface by Micronized Calcium Carbonate on Increasing the Moisture Resistance of Asphalt Mixtures

Cited by 7 publications

References 17 publications

Effectiveness of Calcium Carbonate Whisker in Cementitious Composites

Effectiveness of Calcium Carbonate Whisker in Cementitious Composites

Influence of Polymeric Coating the Aggregate Surface on Moisture Damage of Hot Mix Asphalt

Improving the Moisture Sensitivity of Asphalt Mixtures by Simultaneous Modification of Asphalt Binder and Aggregates with Carbon Nanofiber and Carbon Nanotube

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