Composite cement with improved reactivity and improved fresh properties comprising a hydraulic cement or a caustic activator, a hyaloclastite as pozzolan containing 45-62 wt.-% SiO.sub.2, 10-20 wt.% Al.sub.2O.sub.3, 6-15 wt.-% Fe.sub.2O.sub.3, 7-15 wt.-% CaO, 7-15 wt.-% MgO, 1.5-4 wt.% (K.sub.2O+Na.sub.2O), and having 0-5 wt.-% loss on ignition at 950° C. and ≥50 wt.-% X-ray amorphous phase, and a carbonate filler with an at least bimodal particle size distribution adapted to provide a slope n in a Rosin-Rammler-Sperling-Bennett distribution curve of ≤1.15 in a particle size distribution of the composite cement; a method for manufacturing it, as well as use of a composition comprising the hyaloclastite as pozzolan and the carbonate filler as mineral addition for composite cements comprising a hydraulic cement or a caustic activator.

Composite cement with improved reactivity and improved fresh properties comprising a hydraulic cement or a caustic activator, a hyaloclastite as pozzolan containing 45-62 wt.-% SiO.sub.2, 10-20 wt.% Al.sub.2O.sub.3, 6-15 wt.-% Fe.sub.2O.sub.3, 7-15 wt.-% CaO, 7-15 wt.-% MgO, 1.5-4 wt.% (K.sub.2O+Na.sub.2O), and having 0-5 wt.-% loss on ignition at 950° C. and ≥50 wt.-% X-ray amorphous phase, and a carbonate filler with an at least bimodal particle size distribution adapted to provide a slope n in a Rosin-Rammler-Sperling-Bennett distribution curve of ≤1.15 in a particle size distribution of the composite cement; a method for manufacturing it, as well as use of a composition comprising the hyaloclastite as pozzolan and the carbonate filler as mineral addition for composite cements comprising a hydraulic cement or a caustic activator.

Disclosed is a sulfate corrosion-resistant concrete, a method for optimizing proportion and application thereof. The concrete is formed by mixing and stirring base stocks, aggregates, admixtures, external additives and water. The base stock of the concrete is 17.4-17.5 parts of Portland cement; the aggregates include 38.9 parts of basalt with aggregate size of 5-10 mm and 33.1-33.2 parts of basalt medium sand; the admixtures are 1.9-1.95 parts of silica fume or fly ash, and further including 0.23-0.24 part of polycarboxylate water reducer and 1.34-1.35 part of sulfate corrosion-resistant liquid preservative. Optimized proportion method: according to the corrosion characteristics of sulfate and corrosion environment parameters, determine the composition and proportion of basic samples and comparison samples, make and cure sample components, test the deep components of the samples, and obtain the optimal composition and proportion according to the test results.

A method of cementing may include: mixing at least a cement dry blend, water, and a liquid activated pozzolan additive to form a cement slurry, wherein the liquid activate pozzolan additive comprises a carrier fluid and an activated pozzolan; introducing the cement slurry into a wellbore penetrating a subterranean formation; and allowing the cement slurry to set.

A method of cementing may include: mixing at least a cement dry blend, water, and a liquid activated pozzolan additive to form a cement slurry, wherein the liquid activate pozzolan additive comprises a carrier fluid and an activated pozzolan; introducing the cement slurry into a wellbore penetrating a subterranean formation; and allowing the cement slurry to set.

A method of cementing may include preparing a cement slurry by mixing at least water and a cement dry blend, wherein the cement dry blend comprises a cement and an activated pozzolan; and introducing the cement slurry into a wellbore penetrating a subterranean formation; and allowing the cement slurry to set to form a hardened mass.

A method of cementing may include preparing a cement slurry by mixing at least water and a cement dry blend, wherein the cement dry blend comprises a cement and an activated pozzolan; and introducing the cement slurry into a wellbore penetrating a subterranean formation; and allowing the cement slurry to set to form a hardened mass.

Disclosed herein is a liquid salt activator comprising a salt, a suspending aid, and water, wherein the salt is present in the liquid salt activator in an amount of from about 5 wt. % to about 95 wt. %, based on the total weight of the liquid salt activator. Also disclosed herein is an activated extended life slurry (ELS) composition comprising a hydraulic cement, a supplementary cementitious material, the liquid salt activator, and an aqueous fluid. The activated ELS composition can be used in a method of servicing a wellbore penetrating a subterranean formation.

A non-conforming (or barely conforming) fly ash is converted into conforming (or better conforming) fly ash by: (1) obtaining an initial fly ash with at least one non-conforming (or barely conforming) characteristic selected from excess carbon content, low strength activity index, or low SAF as defined by ASTM C-618 and having a D10, D50 and D90; (2) classifying the initial fly ash using one or more air classifiers to produce at least two separate fly ash streams, including fine fly ash and coarse fly ash; (3) collecting the fine fly ash and the coarse fly ash, the fine fly ash having a D90 less than the D90 of the initial fly ash; (4) combining the fine fly ash with an aluminosilicate source to form a modified fly ash having a conforming carbon content, a conforming reactivity index, and a conforming SAF as defined by ASTM C-618.

Provided herein are compositions, methods, and systems related to cement blend composition comprising reactive vaterite cement and supplementary cementitious material (SCM) comprising aluminosilicate material.