Mitigation of alkali-silica reaction in concrete using readily-soluble chemical additives

Patent metadata

Field	Value
Publication number	US-2022064066-A1
Application number	US-202117527948-A
Country	US
Kind code	A1
Filing date	Nov 16, 2021
Priority date	Aug 14, 2017
Publication date	Mar 3, 2022
Grant date	—

Abstract

A manufacturing method includes: (1) incorporating at least one soluble, calcium, magnesium, or other divalent cation-containing additive into a concrete mixture including aggregates prone to alkali-silica reaction; and (2) curing the concrete mixture to form a concrete product.

First claim

1 - 24 . (canceled)

25 . A method of manufacture, the method comprising:
incorporating at least one divalent cation-containing additive into a concrete mixture including aggregates prone to alkali-silica reaction, wherein the divalent cation-containing additive suppresses alkali-silica reaction of the aggregates; and curing the concrete mixture to form a concrete product, including formation of divalent cation-containing reaction products, at an interface between reactive aggregates and a cementitious pore solution within the concrete mixture.

26 . The method of claim 25 , wherein the aggregates comprise silica.

27 . The method of claim 25 , wherein the aggregates comprise at least one of silicate glass, strained quartz, or microcrystalline quartz.

28 . The method of claim 25 further comprising identifying the aggregates as prone to a alkali-silica reaction, and wherein incorporating the divalent cation-containing additive is responsive to identifying the aggregates prone to the alkali-silica reaction.

29 . The method of claim 25 , wherein incorporating the divalent cation containing additive includes adjusting an amount of the divalent cation-containing additive according to at least one of an amount of the aggregates or reactivity of the aggregates.

30 . The method of claim 25 further comprising:
subjecting aggregates to pre-treatment to form pre-treated aggregates;
incorporating the pre-treated aggregates into a concrete mixture; and curing the concrete mixture to form a concrete product,
wherein subjecting the aggregates to pre-treatment includes exposing the aggregates to a solution including a divalent cation-containing additive, forming a divalent cation-containing interfacial barrier at least partially covering the aggregates.

31 . The method of claim 25 further comprising:
incorporating at least one calcium-containing additive into a concrete mixture including aggregates prone to a alkali-silica reaction, wherein the calcium-containing additive suppresses the alkali-silica-reaction of the aggregates, and curing the concrete mixture to form a concrete product, including forming a calcium-containing interfacial layer at least partially covering the aggregates.

32 . The method of claim 31 , wherein the calcium-containing interfacial layer comprises calcium-silicate-hydrate and calcite.

33 . The method of claim 31 , wherein the aggregates include silica.

34 . The method of claim 31 , wherein the aggregates comprise at least one of silicate glass, strained quartz, or microcrystalline quartz.

35 . The method of claim 31 further comprising identifying the aggregates as prone to a alkali-silica reaction, and wherein incorporating the divalent cation-containing additive is responsive to identifying the aggregates prone to the alkali-silica reaction.

36 . The method of claim 31 , wherein incorporating the divalent cation containing additive includes adjusting an amount of the divalent cation-containing additive according to at least one of an amount of the aggregates or reactivity of the aggregates.

37 . The method of claim 31 , wherein the calcium-containing additive comprises a calcium-containing salt

38 . The method of claim 31 , wherein the calcium-containing salt comprises calcium nitrate, calcium chloride, or calcium nitrite.

39 . The method of claim 31 , wherein the concrete mixture includes a cement, and the calcium-containing additive is incorporated into the concrete mixture in an amount of at least 1% by mass, relative to a mass of the cement included in the concrete mixture.

40 . The method of claim 39 , wherein the calcium-containing additive is incorporated into the concrete mixture in an amount sufficient to attain an initial concentration of calcium ions in a pore solution of the concrete mixture of at least 30 mM.

41 . The method of claim 25 further comprising:
incorporating at least one magnesium-containing additive into a concrete mixture including aggregates prone to a alkali-silica reaction, wherein the magnesium-containing additive suppresses the alkali-silica-reaction of the aggregates, and
curing the concrete mixture to form a concrete product.

42 . The method of claim 41 , wherein the curing the concrete comprises forming a magnesium-containing interfacial layer at least partially covering the aggregates.

43 . The method of claim 41 , wherein the magnesium-containing additive is a magnesium-containing salt.

44 . A concrete product, comprising:
a binder; aggregates dispersed within the binder; and a calcium-containing interfacial layer at least partially covering the aggregates.

45 . The concrete product of claim 44 , wherein the calcium-containing interfacial layer comprises calcium-silicate-hydrate and calcite.

46 . A concrete product, comprising:
a binder; aggregates dispersed within the binder; and a magnesium-containing interfacial layer at least partially covering the aggregates.

Assignees

• Univ California
• Yara Int Asa
• Basf Corp

Inventors

• Sant Gaurav
• Falzone Gabriel
• Oey Tandre
• Franke Wolfram
• Seiler Paul
• La Plante Erika

Classifications

• C04B20/1074

  Silicates, e.g. glass · CPC title

• C04B14/22

  Glass {; Devitrified glass} · CPC title

• C04B2111/2023

  Resistance against alkali-aggregate reaction · CPC title

• C04B28/02 Primary

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B22/085 Primary

  containing nitrogen in the anion, e.g. nitrites · CPC title