Characteristics of bonding behavior between basic oxygen furnace slag and asphalt binder

Chen, Zongwu; Xie, Jun; Xiao, Yue; Chen, Juyong; Wu, Shaopeng

doi:10.1016/j.conbuildmat.2014.04.074

Cited by 82 publications

(28 citation statements)

References 18 publications

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“…This is because microcline and albite are strongly alkaline minerals with highly positive electronic charges. This finding verifies the existing experimental results that a mineral with an alkaline nature (with electro-positive charge) has a stronger adhesion with the weakly acidic bitumen than an acidic mineral [43][44]. This indicates that the adhesion between minerals and bitumen completely results from the nonbond interaction.…”

Section: Adhesion Between Minerals and Bitumen At Dry And Wet Conditionssupporting

confidence: 91%

Impact of minerals and water on bitumen-mineral adhesion and debonding behaviours using molecular dynamics simulations

Gao

Zhang

et al. 2018

Construction and Building Materials

147

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This study aims to evaluate the effects of mineral types and water on the adhesion properties and debonding behaviours of bitumen-mineral interface systems. A molecular dynamics modelling approach was employed to simulate the interactions between minerals and bitumen with and without the presence of water. Four representative minerals (quartz, calcite, albite and microcline) were selected to build the mineral-bitumen interface systems and the mineralwater-bitumen interface systems in the molecular dynamics models. The adhesion property between minerals and bitumen was quantified by work of adhesion, defined as the energy required to separate a unit area of the bitumen-mineral interface. The debonding behaviour between minerals and bitumen is characterised by work of debonding, defined as the energy required to displace bitumen by water at the mineral-bitumen interface. The simulation results were validated by available experimental results reported in the literature. It was found that the work of adhesion and the work of debonding for the four bitumen-minerals interface systems are ranked microcline > albite > calcite > quartz at both dry and wet conditions. Moisture can reduce the adhesion between minerals and bitumen by 82%, 84%, 18% and 1% for the quartz, calcite, albite and microcline, respectively. The adhesion between minerals and bitumen is attributed to the non-bond interaction energy, in which the major component is van der Waals interaction for neutral minerals (e.g., quartz) and the electrostatic interaction for the alkali minerals (e.g., calcite, albite and microcline). The bitumen-mineral debonding is a thermodynamically favourable process with reduced total potential energy of the system. It is concluded that the bitumen-mineral adhesion and debonding behaviours strongly depends on the chemistry and mineralogical properties of the minerals. This work provides a fundamental understanding of the adhesion and debonding behaviours of the bitumen-mineral interface at the atomistic scale.

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Section: Adhesion Between Minerals and Bitumen At Dry And Wet Conditionssupporting

confidence: 91%

Impact of minerals and water on bitumen-mineral adhesion and debonding behaviours using molecular dynamics simulations

Gao

Zhang

et al. 2018

Construction and Building Materials

147

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“…Differential thermal gradients between the aggregate and cement paste changes the fracture and energy release causing concrete spalling . However, if the difference between the expansion and contraction linear profiles under heating is minimized, the issue of differential thermal gradients leading to thermos‐incompatibility is negligible …”

Section: Introductionmentioning

confidence: 99%

Specimens size, aggregate size, and aggregate type effect on spalling of concrete in fire

2017

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SummaryThis paper attempted to isolate variables that govern concrete spalling when exposed to a hydrocarbon fire. The influence of specimen size was investigated by studying 4 specimen sizes consisting of cylinders, columns, and panels. Three aggregate sizes, 7 mm, 14 mm, and 20 mm were used in the concrete mixes to determine their effect on concrete spalling. Influence of aggregate type on concrete spalling was also investigated. Forty-two different specimens were considered in this investigation. Concrete spalling was quantified as nominal spalling depth, which has been presented as a new way of quantifying the degree of concrete spalling. The results indicated that specimen size did have an effect on the spalling of concrete under hydrocarbon fire exposure and that nominal spalling depth of concrete increases as the specimen size increases.Aggregate size effect was evident when the maximum aggregate size increased from 7 mm to 20 mm, and explosive spalling was more severe for specimens with small size aggregates. Specimens with 14-mm aggregate size showed inconsistent results and the spalling behavior witnessed was more random and sporadic. The type of aggregate used has no clear bearing on concrete spalling given both aggregates had similar linear expansion profiles. However, concrete is susceptible to a less known phenomenon termed spalling in fire. Spalling of concrete in fire is the dislodgement of small pieces of concrete up to 50 mm (popping out) from the surface of the concrete, often explosive in nature. If the degree of spalling is significant, the load bearing capacity of the concrete member can be reduced due to (1) reduction in its cross-sectional size, and (2) rapid increase in temperatures of the reinforcement. more predominate when concrete is subjected to hydrocarbon fire due to the rapid heating rise. 5 The moisture content of the specimen has been reported to be a significant factor which governs spalling. 6High levels of moisture content generate the buildup of pore water pressures.A number of key researchers have studied the factors which govern spalling including thermal stresses, pore pressures, thermal dilation, and incompatibility between cement paste and aggregate. 7-10 The "moisture-clog mechanism" due to the buildup of pore water pressures has been widely accepted as the main mechanism causing concrete spalling. 9,[11][12][13][14][15][16][17] Contrary to this, spalling caused by differential thermal gradients within the concrete element has also been widely accepted to explain the spalling phenomenon. crack of critical size and orientation increases with the volume of the specimen. [22][23][24] This is in agreement with Bazant's size effect law (SEL) theory, which states that as the specimen size increases, the compressive strength decreases. 23,25,26 In relation to spalling, the "size effect" phenomenon has a direct effect on the moisture content of the concrete specimen, the rate of in situ heating, and water mass loss. | EXPERIMENTAL PROGRAMMEThe materials used in this investig...

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“…2). This was because steel slag contained some silicate minerals [21] and the hydration of silicate minerals made impurity layer solidified. Weathered slag tightly covered by impurity layer was called original WSFA.…”

Section: Methodsmentioning

confidence: 99%

Utilization of gneiss coarse aggregate and steel slag fine aggregate in asphalt mixture

Chen

Wen

et al. 2015

Construction and Building Materials

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Characteristics of bonding behavior between basic oxygen furnace slag and asphalt binder

Cited by 82 publications

References 18 publications

Impact of minerals and water on bitumen-mineral adhesion and debonding behaviours using molecular dynamics simulations

Impact of minerals and water on bitumen-mineral adhesion and debonding behaviours using molecular dynamics simulations

Specimens size, aggregate size, and aggregate type effect on spalling of concrete in fire

Utilization of gneiss coarse aggregate and steel slag fine aggregate in asphalt mixture

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