Cement Binder Composition for High Early Strength and Low CO2
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Solution Overview
Problem
The use of high amounts of supplementary cementitious materials in cement formulations, such as LC3 cement, results in low early strength due to reduced C3S content from OPC, while additives to improve workability can affect hydration and spreadability, and there is a need for a composition that reduces CO2 emissions and maintains comparable strength to OPC.
Innovation Solution
A binder composition comprising Portland cement clinker, calcium sulfate, an inorganic sulfate source with high solubility, polyalcohol or metal salts, a carbonate, and a dispersant with a charge density greater than 0.80 μeq/g, which retards hardening and improves compressive strength and workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If high amounts of supplementary cementitious materials are used in cement formulations, then CO2 emissions are reduced, but early strength is lowered
Solution Approach 1:
The patent modifies the chemical composition parameters of the cement binder by introducing specific additives (polyol, carboxylic acid, sulfate source) in controlled amounts to alter the hydration kinetics and strength development trajectory, enabling LC3 cement to achieve OPC-level early strength while maintaining reduced C3S content for lower CO2 emissions
Solution Approach 2:
The invention creates a composite binder system combining Portland cement clinker with supplementary cementitious materials (limestone, calcined clay) and specific chemical additives, where the synergistic interaction between components enables both low CO2 profile and high early strength through optimized composition ratios
2Ease of operation
If additives are added to improve workability, then spreadability is improved, but hydration is affected and early strength development is altered
Solution Approach 1:
The patent employs multifunctional additives that simultaneously provide workability enhancement (improved spreadability, reduced bleeding) and early strength promotion through combined mechanisms including dispersion, retardation, and acceleration of beneficial hydration reactions
Solution Approach 2:
The invention optimizes the concentration parameters of multiple additives (polyol: 0.1-5 wt.%, carboxylic acid: 0.1-5 wt.%, sulfate source: 0.1-5 wt.%) to achieve the desired balance between workability improvement and strength development, preventing excessive retardation while maintaining adequate early strength
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 binder composition achieves high early and late strength with improved workability and reduced CO2 profile, maintaining strength comparable to OPC with a lower amount of Portland cement clinker.
Implementation Method 1
dispersant having a charge density of more than 0.80 μeq/g
Implementation Method 2
an inorganic sulfate source having a solubility higher than 100 g/l at 20° C.
Implementation Method 3
the performance of the cement is comparable with the OPC in many aspects such as long-term strength
Data Source
AI summary
The present invention relates to a binder composition comprising Portland cement clinker, calcium sulfate, an inorganic sulfate source having a solubility higher than 100 g/l at 20° C. polyalcohol and/or metal salts thereof, a carbonate selected of the group consisting of organic carbonate, alkali carbonate, and mixtures thereof, a component F), and dispersant having a charge density of more than 0.80 μeq/g.