An experimental investigation of flame retardant mechanism of hydrated lime in asphalt mastics

Wu, Ke; Zhu, Kai; Mai, Cheng‐Kang; Wu, Bin; Huang, Zhiyi

doi:10.1016/j.matdes.2016.04.057

Cited by 49 publications

(29 citation statements)

References 24 publications

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“…e cone calorimeter test was performed on the base binder (BA), 40 wt.% hydrated lime modified binder (HL), 40 wt.% limestone modified binder (LS), and 40 wt.% magnesium hydroxide modified binder (MH), simulating the asphalt combustion process under a fire condition with 50 kW·m −2 radiation intensity. e heat release features were reported in our previous paper [7]; the test results of the smoke release characteristics are shown in Table 2. e average RSR of HL was 10.32 m 2 ·m −2 ·s −1 , a decrease of 36.5% relative to BA and 24.5% relative to LS.…”

Section: Cone Calorimeter Analysismentioning

confidence: 92%

“…is layer tends to fail at the later stage of combustion, however, causing the combustion to intensify; thus, the rate of smoke release continues to increase. However, in the combustion of HL, CaCO 3 generated through the carbonation of hydrated lime promotes the formation of an inert dense layer on the asphalt surface [7], retarding the combustion and suppressing the smoke. Hence, the RSR declines faster.…”

Section: Cone Calorimeter Analysismentioning

confidence: 99%

“…e combustion of asphalt is typically accompanied with a quantity of toxic smoke [3,4], seriously endangering any personnel within the affected areas. To solve this problem, applying flame retardant to asphalt has become a common way to reduce the hazards associated with pavement during tunnel fires [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Due to their nontoxic characteristics and their capability for smoke suppression, metal hydroxides are prevalently used to modify the flame resistance of asphalt [7][8][9][10][11][12]. Among them, hydrated lime did not initially attract the attention of researchers since it decomposes at a relatively high temperature that exceeds the ignition point of asphalt [13].…”

Section: Introductionmentioning

confidence: 99%

“…However, some recent studies have shown different results. Hydrated lime has been proved to promote the formation of a dense inert layer on the asphalt surface by carbonation in the combustion process [7], thus inhibiting the continuous combustion of asphalt, serving as an excellent flame retardant [14]. However, the mechanism of how hydrated lime affects the smoke release of asphalt during combustion requires further study.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Investigation on Smoke Suppression Mechanism of Hydrated Lime in Asphalt Combustion

Zhu

Wang

Zhou

et al. 2018

Journal of Chemistry

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In this study, cone calorimeter and thermogravimetric analyses were used to simulate the asphalt combustion process under the conditions of fire radiation and programmed temperature increase. e gaseous compositions and release rules were analyzed by infrared spectroscopy to investigate the influence of hydrated lime on the smoke suppression mechanism in the asphalt combustion process. e experimental results show that hydrated lime can promote the asphalt mastic surface to form a barrier layer during the combustion process. is barrier layer can reduce the burning intensity of asphalt. Although the compositions of gaseous products do not change much, the rates of CO production and smoke release are decreased. In addition, hydrated lime is alkaline and can thus neutralize acidic gases such as SO 2 and reduce the toxicity of gaseous products. With the addition of 40 wt.% hydrated lime, the total smoke release and the CO release rate both decrease by more than 20% relative to the addition of the same amount of limestone fillers and decrease by more than 10% relative to the addition of the same amount of magnesium hydroxide flame retardant.

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Section: Cone Calorimeter Analysismentioning

confidence: 92%

Section: Cone Calorimeter Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation on Smoke Suppression Mechanism of Hydrated Lime in Asphalt Combustion

Zhu

Wang

Zhou

et al. 2018

Journal of Chemistry

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Special Uses

2020

Flame Retardants

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Study on fire resistance and mechanical properties of modified recycled waste oyster powder in asphalt binder

Ren,

Deng,

L.V.

et al. 2024

J of Applied Polymer Sci

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In this study, an eco‐friendly approach is presented for the innovative use of waste oyster shell (OS) powder modified with zinc stannate, aliphatic alcohols, and silane coupling agents blended with styrene‐butadiene‐styrene (SBS) modified asphalt to make a flame‐retardant binder (modified oyster shell [MOS]/styrene‐butadiene‐styrene [SBS]/MA), which is rendered flame retardant and smoke suppressive. Compared with the original SBS/MA, MOS/SBS/MA with a 2% addition rate showed a 35.44% increase in ultimate oxygen index, a 30.62% reduction in peak exotherm, a 10.87% reduction in smoke density, and a 75% reduction in volatile organic compound (VOC) emissions. It also has excellent mechanical properties, with increases in composite modulus, elastic modulus, and storage modulus of 68.58%, 97.29%, and 59.59%, respectively, at 46°C. The thermal stability of MOS/SBS/MA is also improved, with a decomposition temperature 26°C higher than that of SBS/MA. Pavement performance tests show that the water‐soaked Marshall's split strength has increased by 3.87% and the coefficient of rutting by 3.51%. Increased by 3.51%, this method effectively utilizes the waste OS, improves the fire‐retardant properties of asphalt while retaining the mechanical properties of the modified asphalt binder, and provides a model for developing sustainable fire‐retardant asphalt in coastal areas.

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An experimental investigation of flame retardant mechanism of hydrated lime in asphalt mastics

Cited by 49 publications

References 24 publications

Investigation on Smoke Suppression Mechanism of Hydrated Lime in Asphalt Combustion

Investigation on Smoke Suppression Mechanism of Hydrated Lime in Asphalt Combustion

Special Uses

Study on fire resistance and mechanical properties of modified recycled waste oyster powder in asphalt binder

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