Acid-Activated Cement Slurry for Low-Temperature Curing

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Solution Overview

Problem

Existing cement structures face challenges in curing at low temperatures, leading to delayed strength development and increased vulnerability to carbonation, particularly in cold environments, and require additional thickness for carbonation protection, which increases costs.

Innovation Solution

Incorporating magnesium-iron solid solution silicates as a filler in cement slurries, activated through acid activation and carbonation, to enhance curing at low temperatures and improve resistance to carbonation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If cement is cured at low temperatures, then the structure can be constructed in cold environments, but the strength development is delayed and carbonation resistance is reduced

Engineering Contradiction:

Improvecuring temperatureVSAvoidstrength development

Core Design Contradiction:

TemperatureVSStrength

Solution Approach 1:

The invention changes the chemical parameters of the cement slurry by adding acid-activated magnesium-iron solid solution silicate filler, which modifies the hydration reaction characteristics to enable proper strength development at low temperatures where conventional cement would fail to cure properly

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite cementitious material by combining conventional cement with acid-activated magnesium-iron solid solution silicate filler, leveraging the synergistic effects of both materials to achieve both low-temperature curing capability and adequate strength development

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If cement structure thickness is increased to protect against carbonation, then carbonation resistance is improved, but construction costs increase

Engineering Contradiction:

Improvecarbonation resistanceVSAvoidstructure thickness

Core Design Contradiction:

Object-affected harmful factorsVSWeight of stationary object

Solution Approach 1:

The invention converts the naturally harmful carbonation process into a beneficial effect by utilizing CO2 reaction with the magnesium-iron solid solution silicate filler to form protective carbonate layers on the filler particles, which then protect the cement matrix from carbonation while maintaining structural thickness

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Productivity

If cement hydration is accelerated to reduce curing time, then productivity is improved, but the reaction may not proceed properly at low temperatures

Engineering Contradiction:

Improvecuring speedVSAvoidlow temperature performance

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The invention changes the chemical composition parameters of the cement slurry by incorporating acid-activated magnesium-iron solid solution silicate filler, which fundamentally alters the hydration mechanism to enable both accelerated reaction kinetics and proper low-temperature performance simultaneously

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution allows for faster cement reactions and improved resistance to carbonation, maintaining strength and reducing carbonation depth without increasing structure thickness, even in cold conditions.

Implementation Method 1

Magnesium-iron solid solution silicates can absorb CO2 through a carbonation process as described herein

Methodology Applied

Scientific EffectCarbonation:

Implementation Method 2

The hydration of the cement will drastically slow down or even completely stop in cold conditions

Methodology Applied

Scientific EffectHydration: Mineral Hydration

Implementation Method 3

an acid activated magnesium-iron solid solution silicate filler

Methodology Applied

Scientific EffectAcid activation:

Data Source

PatentUS20250340485A1Acid activated mixture, cement slurry and structure

Publication Date: 2025.11.06 RESTONE AS

AI summary

The invention relates to a relates to an acid activated mixture comprising: an acid activated magnesium-iron solid solution silicate filler; cementitious material; and carbon dioxide (CO2); wherein the magnesium-iron solid solution silicate filler has at most 7% free water, and wherein the magnesium-iron solid solution silicate filler is between 4% and 55% by weight of cementitious material. The invention further relates to a method for producing an acid activated cement slurry comprising the steps: making a slurry comprising a non-acid activated or acid activated magnesium-iron solid solution silicate filler, water, and cementitious material; adding carbon dioxide (CO2) to the slurry; and optionally adding an acid to the slurry; wherein the magnesium-iron solid solution silicate filler is between 4% and 55% by weight of cementitious material. The invention also relates to a process for making an acid activated structure, an acid activated cement slurry obtainable by the method, use of the acid-activated cement slurry for making an acid activated structure, aspect, and an acid activated structure obtainable by the process.