title: Reusing fly ash in glass fibre reinforced cement: a new generation of high-quality GRC composites.
abstract: New composite materials based on an alkali-resistant glass-fibre reinforced cement (AR-GRC) system are being developed by using fly ash (FA) produced at coal thermoelectric power plants, and fluid catalytic cracking catalyst residue (FC3R) from the petrol industry as cement replacement materials. These wastes are reactive from the pozzolanic viewpoint, and modify the nature and the microstructure of the cement matrix when a part of the Portland cement is replaced in the formulation of GRC. Several microstructural and mechanical aspects are being studied for AR-GRC systems. The behaviour of composites exposed to ageing shows that the pozzolanic activity of the ground FA added in high amounts and its mixture with the FC3R increase the flexural strength and no evidences of strength decay are observed. Additionally, the fibres due to the high alkalinity of the cementing matrix can be deteriorated. Fibres in the control (only Portland cement) and FC3R containing composites were attacked, whereas composites with FA and their mixture with FC3R show that the fibres have not been attacked, due to the pozzolanic activity of replacing materials that reduce the calcium hydroxide content in the cementing matrix.
authors.affiliation: Instituto de Ciencia y Tecnología del Hormigón (ICITECH), Edificio Caminos II, Universidad Politécnica de Valencia, Camino de Vera s/n, E-46022 Valencia, Spain. jjpaya@cst.upv.es
authors.forename: J
authors.initials: J
authors.lastname: Payá
authors.forename: M
authors.initials: M
authors.lastname: Bonilla
authors.forename: M V
authors.initials: MV
authors.lastname: Borrachero
authors.forename: J
authors.initials: J
authors.lastname: Monzó
authors.forename: E
authors.initials: E
authors.lastname: Peris-Mora
authors.forename: L F
authors.initials: LF
authors.lastname: Lalinde
mesh_terms: D002126:Calcium Hydroxide / Q000737:chemistry; D002244:Carbon; D003031:Coal; D060729:Coal Ash; D019245:Compressive Strength; D003247:Conservation of Natural Resources; D003252:Construction Materials; D005898:Glass / Q000032:analysis* / Q000737:chemistry; D008422:Materials Testing; D010316:Particle Size; D052638:Particulate Matter; D011210:Power Plants; D012037:Refuse Disposal / Q000379:methods*; D019279:Resin Cements / Q000032:analysis* / Q000737:chemistry; D013314:Stress, Mechanical; D013997:Time Factors
chemical_list: D003031:Coal; D060729:Coal Ash; D052638:Particulate Matter; D019279:Resin Cements; C009753:fiberglass; D002244:Carbon; D002126:Calcium Hydroxide