Aluminum hydroxide enhanced mortar composition

Patent metadata

Field	Value
Publication number	US-2021387914-A1
Application number	US-202117405459-A
Country	US
Kind code	A1
Filing date	Aug 18, 2021
Priority date	Jul 25, 2019
Publication date	Dec 16, 2021
Grant date	—

Abstract

A mortar composition, which includes (i) a treated palm oil fuel ash, wherein the treated palm oil fuel ash is the only binder present, (ii) a fine aggregate, (iii) an alkali activator containing an aqueous solution of sodium hydroxide and sodium silicate, and (iv) aluminum hydroxide as a strength enhancer. A cured mortar made from the mortar composition is also disclosed with advantageous compressive strength properties.

First claim

1 . An aluminum hydroxide enhanced mortar composition, comprising:
a treated palm oil fuel ash as a binder, wherein the treated palm oil fuel ash is the only binder present and wherein the treated palm oil fuel ash has a median particle size (d 50 ) of 0.5 to 2.0 μm; a fine aggregate having an average particle size of 0.3 to 1 mm; an alkali activator comprising an aqueous solution of sodium hydroxide and sodium silicate; and aluminum hydroxide as a strength enhancer, wherein the aluminum hydroxide is the only strength enhancer present, and water; wherein a weight ratio of the aluminum hydroxide to the treated palm oil fuel ash is 0.015:1 to 0.04:1, and wherein a weight ratio of the water to the treated palm oil fuel ash is 0.3 to 0.9.

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6 . The mortar composition of claim 1 , wherein the treated palm oil fuel ash comprises, as constituent oxides, 66 to 68 wt. % SiO 2 , 6 to 7 wt. % Al 2 O 3 , 5 to 6.5 wt. % Fe 2 O 3 , 5 to 6 wt. % CaO, 2.5 to 3.5 wt. % MgO, 4.5 to 6 wt. % K 2 O, 0.3 to 0.35 wt. % SO 3 , 0.18 to 0.2 wt. % Na 2 O, and 3 to 4 wt. % of P 2 O 3 , each based on a total weight of the treated palm oil fuel ash.

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8 . The mortar composition of claim 1 , wherein a weight ratio of the fine aggregate to the treated palm oil fuel ash is 1:1 to 2:1.

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17 . The mortar composition of claim 1 , which consists of the treated palm oil fuel ash, the fine aggregate, sodium hydroxide, sodium silicate, aluminum hydroxide, and water.

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Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Salami Babatunde Abiodun
• Johari Megat Azmi Megat
• Maslehuddin Mohammed
• Ahmad Zainal Arifin

Classifications

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title

• C04B28/021 Primary

  Ash cements, e.g. fly ash cements (fly ash as filler C04B18/08); Cements based on incineration residues, e.g. alkali-activated slags from waste incineration (alkali-activated combustion residues as such C04B7/243; mixtures of the lime-pozzuolane type C04B28/18); Kiln dust cements · CPC title

• C04B18/02

  Agglomerated materials {, e.g. artificial aggregates} · CPC title

• C04B2111/00215

  Mortar or concrete mixtures defined by their oxide composition · CPC title

• C04B18/087

  from liquid fuels, e.g. oil · CPC title