Fiber-Reinforced Hydraulic Composition With Controlled Pore Structure
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Solution Overview
Problem
Existing hardened bodies lack high impact resistance, dimensional stability, and low water absorbency while maintaining high bending strength.
Innovation Solution
A hardened body comprising alkali-resistant fiber, calcium silicate, and calcium aluminate, with specific pore volume ratios and crystal content, optimized to enhance impact resistance, dimensional stability, and bending strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cement is used as a bonding material, then high versatility and strength are achieved, but a large amount of carbon dioxide is generated and environmental impact increases
Solution Approach 1:
The invention changes the chemical composition parameters by replacing cement with a specific combination of blast furnace slag fine powder (30-80 wt%), slaked lime (5-30 wt%), and alkali-resistant fibers (0.1-5 wt%), while controlling the pore volume ratio parameter to achieve both strength and low carbon emission
Solution Approach 2:
The invention creates a composite bonding material system combining blast furnace slag fine powder, slaked lime, and alkali-resistant fibers in specific proportions to achieve the desired mechanical properties without relying on cement
2Quantity of substance
If pore volume in the range of 11 to 300,000 nm is increased, then water absorbency increases, but dimensional stability and impact resistance deteriorate
Solution Approach 1:
The invention precisely controls the pore volume ratio parameter (V11-300000/V6-10 ≤ 14) by adjusting the composition of blast furnace slag fine powder, slaked lime, and alkali-resistant fibers to achieve the optimal balance between water absorbency and dimensional stability
Solution Approach 2:
The invention creates different pore structures in different regions of the hardened body, with fine pores (6-10 nm) providing dimensional stability and coarse pores (11-300,000 nm) providing water absorbency, controlled by the local distribution of fibers and cementitious materials
3Strength
If alkali-resistant fiber content is increased, then impact resistance and bending strength improve, but manufacturing complexity increases
Solution Approach 1:
The invention optimizes the alkali-resistant fiber content parameter to a specific range (0.1-5 wt%) and controls the pore volume ratio (V11-300000/V6-10 ≤ 14) to achieve high impact resistance while maintaining manufacturing simplicity through standardized mixing processes
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 hardened body achieves high impact resistance, high dimensional stability, and low water absorbency with improved bending strength through controlled pore formation and reduced cement usage.
Implementation Method 1
a hydraulic composition containing cement, blast furnace slag fine powder, and slaked lime
Implementation Method 2
a ratio of a pore volume in a range of from 11 to 300,000 nm to a pore volume in a range of from 6 to 10 nm in a pore size distribution
Data Source
AI summary
The present invention relates to a hardened body of a hydraulic composition, the hardened body comprising: an alkali-resistant fiber; calcium silicate; and calcium aluminate, wherein a ratio of a pore volume in a range of from 11 to 300,000 nm to a pore volume in a range of from 6 to 10 nm in a pore size distribution of the hardened body determined by a mercury intrusion method is 14 or less.