An adduct of a polyetheramine and an epoxy-containing compound is used as an agent for reducing drying shrinkage and/or drying cracking in a mineral binder composition.

An adduct of a polyetheramine and an epoxy-containing compound is used as an agent for reducing drying shrinkage and/or drying cracking in a mineral binder composition.

Additives for cementitious compositions are stabilized against particle agglomeration. The additive may be provided in an aqueous liquid admixture composition for cementitious compositions that includes the additive, a polymer thickener, and water, where the particles are stabilized against agglomeration and the admixture is stabilized against physical separation. The method for stabilizing the additive against particle agglomeration utilizes a pH sensitive thickener that may be activated through neutralization of acid groups on the polymer thickener. Methods of making cementitious compositions and hardened cementitious structures using the stabilized additive and admixture are also disclosed.

Additives for cementitious compositions are stabilized against particle agglomeration. The additive may be provided in an aqueous liquid admixture composition for cementitious compositions that includes the additive, a polymer thickener, and water, where the particles are stabilized against agglomeration and the admixture is stabilized against physical separation. The method for stabilizing the additive against particle agglomeration utilizes a pH sensitive thickener that may be activated through neutralization of acid groups on the polymer thickener. Methods of making cementitious compositions and hardened cementitious structures using the stabilized additive and admixture are also disclosed.

An additive for cementitious compositions for mitigating alkali-silica reaction (ASR) includes particles of alkali-silica reaction mitigating that are against agglomeration. The additive may be provided in an aqueous liquid admixture composition for cementitious compositions that includes the alkali-silica reaction mitigating additive, a thickening agent and water. The admixture utilizes a pH sensitive thickener in combination with pH adjustment to stabilize the particles of alkali-silica reaction mitigating additive against agglomeration. The admixture composition is used to mitigate the alkali-silica reactions in a cementitious composition. Methods of making the admixture, cementitious compositions and hardened cementitious structures are also disclosed.

An additive for cementitious compositions for mitigating alkali-silica reaction (ASR) includes particles of alkali-silica reaction mitigating that are against agglomeration. The additive may be provided in an aqueous liquid admixture composition for cementitious compositions that includes the alkali-silica reaction mitigating additive, a thickening agent and water. The admixture utilizes a pH sensitive thickener in combination with pH adjustment to stabilize the particles of alkali-silica reaction mitigating additive against agglomeration. The admixture composition is used to mitigate the alkali-silica reactions in a cementitious composition. Methods of making the admixture, cementitious compositions and hardened cementitious structures are also disclosed.

Embodiments provide a method for controlled release of a cement additive for use in a wellbore. The method includes the steps of mixing an aramide capsule with a cement slurry to form an additive-containing slurry, and introducing the additive-containing slurry into the wellbore. The aramide capsule is formed by interfacial polymerization where an aramide polymer forms a semi-permeable membrane encapsulating the cement additive.

A geopolymer cementing fluid with controllable thickening time includes the following components in parts by weight: 100 parts of a cementitious material, 10 parts-30 parts of an activator, 0.2 parts-5 parts of a retarder, 0.4 parts-4 parts of an anti-settling agent, and 30 parts-70 parts of water. The geopolymer cementing fluid of the present invention has the advantages of controllable thickening time, excellent compressive strength, good settlement stability, good rheological properties, green and eco-friendly, and the like. The geopolymer cementing fluid can be better suited for the operations of oil and gas well cementing and ensure cementing safety.

A method includes introducing an epoxy resin system to a wellbore defect in a wellbore. The epoxy resin system comprises a polyhedral oligomeric silsesquioxane (POSS) epoxy resin with at least one reactive group and a curing agent. The method includes maintaining the epoxy resin system in the wellbore such that a cured epoxy resin system product forms in the wellbore defect.

A method includes introducing an epoxy resin system to a wellbore defect in a wellbore. The epoxy resin system comprises a polyhedral oligomeric silsesquioxane (POSS) epoxy resin with at least one reactive group and a curing agent. The method includes maintaining the epoxy resin system in the wellbore such that a cured epoxy resin system product forms in the wellbore defect.