Synergistic Effect of 4A Zeolite from Rice Husk Ash without Aging Time and Silane on the Adhesion Properties of a Warm Mix Asphalt

Abstract

4A Zeolite was synthesized using rice husk ash (RHA) as a raw material in a microwaveassisted hydrothermal synthesis. Two new procedures were proposed: procedure A, using RHA as the raw material, and procedure B, using the depolymerized RHA. Both procedures were performed using microwave-assisted hydrothermal synthesis, and neither synthesis required an aging time. Crystallinities of over 90 and 80% were reached at 100 °C after 30 min of microwave heating for procedures A and B, respectively. The obtained zeolites were used as warm mix asphalt additives, and the performance of the zeolite obtained from procedure A was better. Additionally, the zeolite obtained from procedure A and commercial silane were used separately as asphaltaggregate adhesion promoter. An increase in the adhesion percentage from 30% of a blank sample to 94% was observed.

Towards a Correlation Between Iron/Cobalt Content, Support Pore Size and Metal Particle Size in Supported Catalysts

“…[26] Regarding zeolite 4A, the material has well- defined cubic crystals, which is also reported by several authors. [24,25,35,36] The EDS spectrum shows a Si/Al molar ratio of approximately 0.84, a value close to that reported by Arroyo-Martínez et al, [24] and for LTA zeolite. [37,38]…”

“…In the case of zeolite 4A, first, second and third mass loss events are related to water loss. [24,25] For Aerosil 200 silica, the TG profile indicates a single thermal event in the range between 40 and 120 °C, which is also associated with water loss. [26] Figure 2 shows the TG profiles of FeÀ Co-based catalysts supported on (A) γ-Al 2 O 3 , (B) Aerosil 200 silica and (C) zeolite 4A.…”

“…The XRD pattern of the calcined zeolite 4A presents well-defined crystalline phases with diffraction lines characteristic of the zeolitic structure (space group Pm-3 m), as also observed elsewhere. [24,35] The mean apparent crystal diameter, obtained by applying the Scherrer's equation to the peaks indicated with an asterisk in Figure 8C, is 35 nm. It was not possible to estimate the mean apparent crystal diameter of γ-Al 2 O 3 and Aerosil 200 silica by applying the Scherrer's equation.…”

Review on a novel biosilica source for production of advanced silica‐based materials: Wheat husk

“…Zeolites are hydrated crystalline aluminium silicates that have been the matter of studies in numerous fields of research due to their characteristics and properties. 94 There are 40 natural 95 and about 213 types of synthetic zeolites. 96 In general, synthetic zeolites are preferred in specific applications due to their tunable properties.…”

“…Zeolites are hydrated crystalline aluminium silicates that have been the matter of studies in numerous fields of research due to their characteristics and properties . There are 40 natural and about 213 types of synthetic zeolites .…”