Calcium Silicate Cement Additives for Aesthetic Quality
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional concrete products made with Portland cement have high energy consumption and significant CO2 emissions, and while carbonatable calcium silicate-based cements reduce these issues, they often lack improved aesthetics such as reduced haze and water absorption.
Innovation Solution
Incorporating specific additives like calcium stearate and triethanolamine (TEA) into carbonatable calcium silicate-based cement compositions to enhance the aesthetic properties by reducing haze, water absorption, and efflorescence, and improving the curing process with carbon dioxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If carbonatable calcium silicate-based cements are used, then CO2 emissions and energy consumption are reduced, but aesthetic properties (haze, water absorption, efflorescence) deteriorate
Solution Approach 1:
The patent introduces calcium stearate and triethanolamine as intermediary substances that mediate between the carbonatable calcium silicate cement and the environment. These additives form a protective interface that prevents water penetration and efflorescence while maintaining the low-CO2 emission benefit of the base cement material.
Solution Approach 2:
The patent modifies the chemical composition parameters of the cement by adding specific amounts of calcium stearate (0.1-5 wt%) and triethanolamine (0.1-5 wt%). These parameter changes transform the surface properties of the cement, reducing water absorption and preventing efflorescence without compromising the fundamental low-carbonation advantage of calcium silicate-based cements.
2Object-generated harmful factors
If carbonatable calcium silicate-based cements are used, then CO2 emissions are reduced, but water absorption increases
Solution Approach 1:
Calcium stearate and triethanolamine act as intermediary hydrophobic agents that create a water-repellent barrier on the cement surface. This intermediary layer allows the cement to maintain its low CO2 emission advantage while protecting against water absorption that would otherwise occur with the porous calcium silicate structure.
Solution Approach 2:
The additives form a thin hydrophobic film on the cement surface that acts as a flexible barrier to water penetration. This film maintains the breathability and carbonation capability of the cement while preventing excessive water absorption that would lead to efflorescence and aesthetic degradation.
3Use of energy by stationary object
If carbonatable calcium silicate-based cements are used, then energy consumption is reduced, but efflorescence increases
Solution Approach 1:
The calcium stearate and triethanolamine additives serve as intermediary substances that prevent the formation of efflorescence by blocking water pathways. This allows the energy-efficient calcium silicate cement to maintain its low energy consumption advantage while eliminating the efflorescence problem through the protective intermediary layer.
Solution Approach 2:
The patent converts the potential harm of water penetration (which causes efflorescence) into a benefit by using the same water-absorbing capacity of the cement to activate the hydrophobic additives. The additives then transform this water interaction into a protective mechanism that prevents efflorescence while maintaining the low-energy advantage of the calcium silicate base material.
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 use of calcium stearate and TEA in carbonatable calcium silicate-based cements results in concrete products with improved aesthetics, reduced water absorption, and minimized efflorescence, while maintaining the environmental benefits of lower CO2 emissions and energy consumption.
Implementation Method 1
The use of calcium stearate and TEA in carbonatable calcium silicate-based cements results in concrete products with improved aesthetics, reduced water absorption
Implementation Method 2
this new cement sequesters CO2 when cured into concrete products because CO2 is needed to react with the carbonatable calcium silicate materials during the curing process
Implementation Method 3
enhance the aesthetic properties by reducing haze, water absorption, and efflorescence
Data Source
AI summary
Carbonatable calcium silicate-based cements and concretes are presented, which result in concrete compositions that have an improved aesthetics. A cement product includes a plurality of particles of a carbonatable calcium silicate cement and a first additive; wherein, the first additive is a hydrophobic organic acid, or a salt thereof, or a silane, or a polysiloxane.