Effect of fine aggregate form, angularity and texture on the viscoelastic properties of asphalt mortar

2014 ◽  
pp. 637-648 ◽  
Author(s):  
Yiqiu Tan ◽  
Hong Zhang ◽  
Huining Xu ◽  
Yizhuang Wang ◽  
Xing’ao Yao
Keyword(s):  
Viscoelastic Properties ◽  
Fine Aggregate ◽  
Aggregate Form ◽  
Asphalt Mortar

scholarly journals Evaluation of Geometric Characteristics of Fine Aggregate and Its Impact on Viscoelastic Property of Asphalt Mortar

2019 ◽  
Vol 10 (1) ◽  
pp. 130
Author(s):  
Tan Tan ◽  
Zepeng Fan ◽  
Chao Xing ◽  
Yiqiu Tan ◽  
Huining Xu ◽  
...  
Keyword(s):  
Asphalt Mixture ◽  
Viscoelastic Behavior ◽  
Indicator System ◽  
Test Method ◽  
Void Content ◽  
Fine Aggregate ◽  
Natural Sand ◽  
Geometrical Properties ◽  
Geometric Characteristics ◽  
Asphalt Mortar

It has long been recognized that fine aggregate (FA) plays a crucial role in the performance of asphalt mixture, especially for the viscoelastic behavior. In this research, 13 types of FA (1 natural sand, 5 stone chips, and 7 machine-made sands) were selected for investigation. Three indirect indicators (uncompact void content test, flow time test, and standard test method for index of aggregate particle shape and texture ASTM D3398) and three types of direct indicators (form, angularity, and texture) were employed to evaluate the geometric characteristics of FA and conduct comprehensive studies on the indicator system. Meanwhile, the effects of FA geometrical properties on the viscoelastic behavior of asphalt mortar were investigated. The results show that only the form indicator ratio of equivalent ellipse axis (E) and angularity indicator surface parameter (SP) can effectively distinguish different types of fine aggregates. The correlation analysis reveals that the parameters of the four elements in the Burgers model are negatively related to the form index (E) but positively related to the angularity index (SP), while the parameter retardation time ( τ r ) exhibits the opposite. This indicates that the use of less flat-elongated and more angular FA can increase both the overall stiffness and elastic component of asphalt mortar.

scholarly journals Rheological and Interaction Analysis of Asphalt Binder, Mastic and Mortar

Materials ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 128 ◽  
Author(s):  
Meng Chen ◽  
Barugahare Javilla ◽  
Wei Hong ◽  
Changluan Pan ◽  
Martin Riara ◽  
...  
Keyword(s):  
Phase Change ◽  
Interaction Analysis ◽  
Asphalt Binder ◽  
Asphalt Mixtures ◽  
Physical Interaction ◽  
Fine Aggregate ◽  
Mineral Filler ◽  
Asphalt Mastic ◽  
Fine Aggregates ◽  
Asphalt Mortar

This paper investigated the rheological properties of asphalt binder, asphalt mastic and asphalt mortar and the interaction between asphalt binder, mineral filler and fine aggregates. Asphalt binder, mastic and mortar can be regarded as the binding phase at different scales in asphalt concrete. Asphalt mastic is a blend of asphalt binder and mineral filler smaller than 0.075 mm while asphalt mortar consists of asphalt binder, mineral filler and fine aggregate smaller than 2.36 mm. The material compositions of mastic and mortar were determined from the commonly used asphalt mixtures. Dynamic shear rheometer was used to conduct rheological analysis on asphalt binder, mastic and mortar. The obtained test data on complex modulus and phase angle were used for the construction of rheological master curves and the investigation of asphalt-filler/aggregate interaction. Test results indicated a modulus increase of three- to five-fold with the addition of filler and a further increase of one to two orders of magnitude with cumulative addition of fine aggregates into asphalt binder. Fine aggregates resulted in a phase change for mortar at high temperatures and low frequencies. The filler had stronger physical interaction than fine aggregate with an interaction parameter of 1.8–2.8 and 1.15–1.35 respectively. Specific area could enhance asphalt-filler interaction. The mastic and mortar modulus can be well predicted based on asphalt binder modulus by using particle filling effect. Asphalt mortar had a significant modulus reinforcement and phase change and thus could be the closest subscale in terms of performance to that of asphalt mixtures. It could be a vital scale that bridges the gap between asphalt binder and asphalt mixtures in multiscale performance analysis.

scholarly journals Measurement of the viscoelastic properties of asphalt mortar and its components with indentation tests

2019 ◽  
Vol 20 (sup2) ◽  
pp. S797-S811 ◽  
Author(s):  
Hassan Fadil ◽  
Denis Jelagin ◽  
Per-Lennart Larsson ◽  
Manfred N. Partl
Keyword(s):  
Viscoelastic Properties ◽  
Indentation Tests ◽  
Asphalt Mortar

scholarly journals Performance-Based Characterization of Bituminous Mortars Prepared With Ladle Furnace Steel Slag

2020 ◽  
Vol 12 (5) ◽  
pp. 1777 ◽  
Author(s):  
Marco Pasetto ◽  
Andrea Baliello ◽  
Emiliano Pasquini ◽  
Marta Skaf ◽  
Vanesa Ortega-López
Keyword(s):  
Viscoelastic Properties ◽  
Permanent Deformation ◽  
Steel Slag ◽  
Deformation Resistance ◽  
Slight Reduction ◽  
Physical Interaction ◽  
Fine Aggregate ◽  
Ladle Furnace ◽  
Thermal Dependence ◽  
Linear Viscoelastic

A circular approach to managing resources that will promote their reuse and recycling is nowadays of crucial importance for a sustainable society. In this regard, the substitution of natural aggregates by steel slag in construction materials represents a promising option. In this paper, the use of Ladle Furnace Slag (LFS) as sustainable filler and fine aggregate for asphalt mixtures is studied. In particular, the evaluation of the LFS contribution in mastic and mortar mixes at mid-range and high-service temperatures is investigated, employing a dynamic shear rheometer to assess the main viscoelastic properties as well as the fatigue and the permanent deformation resistance of the blends. The experimental findings showed that the addition of LFS led to a clear stiffening effect, altering the chemo-physical interaction with the bitumen and producing an appreciable difference in complex stiffness moduli and phase angles. Regardless of the aging condition, the use of LFS lowered the linear viscoelastic limits and increased the elasticity of blends in the case of both mastics and mortars. It caused also a slightly higher thermal dependence of the linear viscoelastic properties even if the enhanced stiffness and elasticity produced appreciable improvements in the permanent deformation resistance. In contrast, a slight reduction of fatigue resistance was observed under the test conditions and was reasonably ascribed to the higher stiffness of LFS blends. Further research is needed to strengthen these promising results and to address the issues at a multiscale level, in particular to evaluate possible lower workability and reduced ductility due to the encountered higher stiffness of slag-based materials.

scholarly journals Aggregate-Bitumen Interface Enhancement Mechanism of Utilization of Oil Shale Waste as Fine Aggregate in Open Grade Friction Course

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 637 ◽  
Author(s):  
Guo ◽  
Guo ◽  
Chen ◽  
Li ◽  
Li ◽  
...  
Keyword(s):  
Particle Size ◽  
Oil Shale ◽  
Asphalt Binder ◽  
Engineering Application ◽  
Bending Test ◽  
Fine Aggregate ◽  
Reinforcement Mechanism ◽  
Beam Bending ◽  
Indirect Tensile ◽  
Asphalt Mortar

Oil shale waste (OSW), as fine aggregate in the mixture (particle size less than 4.75 mm), can effectively improve the overall properties of open grade friction course (OGFC), but the reinforcement mechanism is not clear. Thus, a comprehensive investigation of the reinforcement mechanism of OSW as fine aggregate is essential to provide better understanding for promoting its engineering application. In this paper, the reinforcement mechanism of OSW was explored through numerical calculations and laboratory tests from three aspects: macroscopic mechanical characteristics of mixture, micromechanics of asphalt mortar containing OSW filler, and adsorption characteristics of OSW. Numerical simulation results showed that the aggregate with a particle size greater than 4.75 mm in OGFC is the skeleton, which is the main loading bearing aggregate, and the skeleton bears more than 85% of external loads. The beam bending test and indirect tensile test results illustrated that the introduction of OSW improves the shear resistance and flexure-tension resistance properties of asphalt mortar, which is beneficial the overall properties of OGFC. From the Brunauer Emmett Tell test and Scanning Electron Microscope test, it was known that OSW has large specific surface area, dense pore structure, and various mesoporous shapes, which means a larger adsorption area and stronger adsorption with asphalt binder. Three self-developed tests containing asphalt adsorption capacity test, infiltrated asphalt saturation test and aggregate-bitumen interface observation test manifested that the existence of “claws”-pointed synapses at OSW-bitumen interface is the main reason for the significant improvement of properties of asphalt mortar containing OSW filler.

Prediction of Dynamic Modulus of Asphalt Mixture Based on Viscoelastic Properties of Asphalt Mortar

2013 ◽  
Vol 651 ◽  
pp. 419-423
Author(s):  
Xiao Li Zhan
Keyword(s):  
Dynamic Modulus ◽  
Viscoelastic Properties ◽  
Complex Modulus ◽  
Loss Modulus ◽  
Asphalt Mixture ◽  
Experimental Measurements ◽  
Dynamic Shear ◽  
Different Temperatures ◽  
Viscoelastic Characteristics ◽  
Asphalt Mortar

The objective of this study is to predict the asphalt mixture dynamic modulus using the viscoelastic properties of asphalt mortar. The dynamic viscoelastic characteristics of asphalt mortar and asphalt mixture are tested at different temperatures and loading frequencies using dynamic shear rheometer, such as storage modulus, loss modulus and phase angle. The complex modulus of asphalt mortar, volume parameters and Hirsch model were used to predict complex modulus of asphalt mixture. The experimental measurements of dynamic modulus were employed to compare with the predictions. The result showed this method can predict complex modulus of asphalt mixture very well.

Study on Effect of Aluminum Powder in CA (Cement Asphalt) Mortar

2014 ◽  
Vol 584-586 ◽  
pp. 1328-1331
Author(s):  
Ling Zhou
Keyword(s):  
Aluminum Powder ◽  
Fine Aggregate ◽  
River Sand ◽  
Cement Asphalt Mortar ◽  
Ca Mortar ◽  
Asphalt Mortar

CA mortar is using the domestic with river sand as aggregate currently in China, we use sand to replace river sand as fine aggregate in CA mortar. The main purpose is test the influence of dosage on aluminum in the CA mortar. Experiments show that dosage should be the best aluminum from 0.01% to 0.015 %.

Dynamic Mechanical Analysis of CRTS II Cement Asphalt Mortar

2014 ◽  
Vol 584-586 ◽  
pp. 1646-1651
Author(s):  
Hua Yang Zhang ◽  
Long Hua Yuan ◽  
De Wei Ren
Keyword(s):  
Viscoelastic Properties ◽  
High Speed ◽  
Mechanical Analysis ◽  
Asphalt Emulsion ◽  
High Speed Railway ◽  
Burgers Model ◽  
Cement Asphalt Mortar ◽  
Different Temperatures ◽  
Ca Mortar ◽  
Asphalt Mortar

Cement asphalt mortar (CA mortar) is one of key structures of slab ballastless high-speed railway. Cement and asphalt emulsion are the main two components of CA mortar, making it possess the viscoelastic properties of viscoelastic materials, which is one of the infancy of the current study. In this paper, DMA method was adopted to investigate the viscoelastic properties of CRTS II CA mortar. Viscoelastic properties of CA mortar at different temperatures were investigated and were compared with the numerical simulation results of Burgers model. The results of the simulation fit in well with the data from the experimental-scale column, so we can study the dynamic modulus of CA mortar using the Burgers model in the temperature range of CA mortar.

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