Waste cathode-ray-tube glass powder modified asphalt materials: Preparation and characterization

The introduction of the Superpave®asphalt binder specification provided the asphalt industry with a useful guideline for choosing appropriate materials to meet the requirements of a specific climate. Acid, alkaline, and polymer modification are just some of the ways to modify asphalt to meet the Superpave specification. The direct tension test (DTT) technique was applied to study the low-temperature properties of modified asphalt in terms of DTT failure stress values and the critical cracking temperature ( Tcritical). The bending beam rheometer (BBR) usually failed to detect improvement in low-temperature performance in polymer-modified asphalt (PMA). DTT results show that elastomeric polymer modification improves the low-temperature performance of PMA. In some PMAs, the failure stress value was higher than 9.5 MPa. The DTT technique for PMA was also reviewed. The effect of acid and alkaline modifiers on asphalt materials was studied. Acid or alkaline modification of asphalt was found to be only temporary and to be reversible. Acid modification of asphalt can be reversed by reaction with alkaline materials such as lime or antistripping agents. Alkaline modification of asphalt can be reversed by reaction with acidic materials such as carbon dioxide. Alkaline also can be washed away by water. Even though the BBR suggested a slight improvement in the low-temperature performance in acid- or alkalinemodified asphalt, the DTT failure stress values and Tcritical did not confirm this improvement. A relatively simple procedure that allows detection of acid or alkaline modification of asphalt materials is described.

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Laboratory Studies of the Effect of Recycled Glass Powder Additive on the Properties of Polymer Modified Asphalt Binders

International Journal of Engineering ◽

10.5829/idosi.ije.2013.26.10a.08 ◽

2013 ◽

Vol 26 (10 (A)) ◽

Cited By ~ 2

Author(s):

M. Ghasemi

Keyword(s):

Glass Powder ◽

Asphalt Binders ◽

Laboratory Studies ◽

Modified Asphalt ◽

Recycled Glass ◽

Polymer Modified Asphalt

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3 Innovative asphalt materials and rubber modified asphalt

Sustainability, Eco-efficiency, and Conservation in Transportation Infrastructure Asset Management ◽

10.1201/b16730-7 ◽

2014 ◽

pp. 103-146 ◽

Cited By ~ 2

Keyword(s):

Modified Asphalt ◽

Asphalt Materials

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Preparation of Hydrothermally Solidified Materials from Waste Cathode Ray Tube Panel Glass for Construction Applications

10.21203/rs.3.rs-212314/v1 ◽

2021 ◽

Author(s):

Qingbo Xu ◽

Jing Zhang ◽

Shunyi Li

Keyword(s):

Glass Powder ◽

Construction Material ◽

Steam Pressure ◽

Processing Method ◽

Saturated Steam ◽

Hydrothermal Processing ◽

High Quality ◽

Slaked Lime ◽

Cathode Ray Tube ◽

Panel Glass

Abstract Solidification of cathode ray tube (CRT) panel glass was carried out using a hydrothermal processing method. In this way, the glass powder was first compacted in a mold at 20 MPa, and then hydrothermally cured in an autoclave under saturated steam pressure at 200 ℃ for 6 hours. The CRT panel glass was then hydrothermally solidified by the formation of tobermorite (Ca5Si6O16(OH)2·4H2O), which was encouraged by the addition of slaked lime (Ca(OH)2). The final solidified specimen’s strength was heavily depended on the amount of tobermorite formed, with higher concentrations of tobermorite producing commensurately greater mechanical strength. With the addition of slaked lime at 20%-30% by mass, the specimen achieved a flexural strength of approximately 16 MPa, which is sufficiently great for using as a construction material. As such, there is cause to believe that the hydrothermal processing method used here may have substantial potential for the product of high-quality recycled CRT panel glass with properties suitable for utilization as a construction material.

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