Lightweight Aggregate Concrete with Multi-Scale Pores for Sound Absorption
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Solution Overview
Problem
Existing cellular concrete materials have limited sound absorption performance, especially in low-frequency ranges, and contribute significantly to carbon emissions and energy consumption, posing challenges for sustainable development.
Innovation Solution
A multi-level and multi-scale pore structure is constructed using expanded perlite, hydrogen peroxide foaming, and physical foaming, combined with low-carbon sulfur-aluminum-ferric cementitious materials and by-product gypsum, to create a lightweight aggregate cellular concrete with enhanced sound absorption and reduced carbon footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cellular concrete is used for sound absorption, then weather resistance and fire resistance are improved, but sound absorption coefficient (especially low-frequency) deteriorates
Solution Approach 1:
The patent applies porous materials by constructing a multi-level and multi-scale pore structure system comprising expanded perlite pores, hydrogen peroxide foaming pores, and physical foaming pores. This porous structure enables the cellular concrete to achieve excellent sound absorption performance (NRC≥0.80) while maintaining weather and fire resistance through the cementitious matrix.
Solution Approach 2:
The patent uses composite materials by combining low-carbon sulfur-aluminum-ferric cementitious materials with expanded perlite, hydrogen peroxide, and physical foaming agents. This composite approach creates a material that integrates the durability of cementitious materials with the sound absorption capabilities of multi-scale porous structures.
2Strength
If traditional cement and natural sand/gravel are used, then structural strength is improved, but carbon emissions and energy consumption increase
Solution Approach 1:
The patent applies parameter changes by using low-carbon sulfur-aluminum-ferric cementitious materials that set and harden rapidly at lower temperatures compared to traditional Portland cement. This reduces the energy consumption and carbon emissions associated with cement production while maintaining structural strength through optimized chemical composition and rapid setting characteristics.
Solution Approach 2:
The patent converts harm into benefit by utilizing industrial solid waste and by-products as raw materials for the cementitious materials and lightweight aggregates. This approach transforms waste materials that would otherwise be harmful environmental pollutants into valuable construction materials, reducing carbon emissions and promoting sustainable development.
3Strength
If traditional cement-based materials are used, then material strength is improved, but setting time increases causing production cycle extension
Solution Approach 1:
The patent applies parameter changes by formulating low-carbon sulfur-aluminum-ferric cementitious materials with optimized chemical compositions that accelerate setting and hardening rates. The specific chemical parameters (sulfur, aluminum, and ferric content) are adjusted to promote rapid hydration reactions, reducing setting time while maintaining final strength.
Solution Approach 2:
The patent applies preliminary action by incorporating chemical foaming agents and foaming processes during material preparation. This creates the desired pore structure in advance, eliminating the need for prolonged curing times required by traditional cement-based materials to achieve stable pore structures.
4Device complexity
If single-scale pores are used, then material simplicity is maintained, but sound absorption bandwidth is limited
Solution Approach 1:
The patent applies segmentation by dividing the pore structure into multiple scales and levels: expanded perlite pores, hydrogen peroxide foaming pores, and physical foaming pores. Each pore scale targets different frequency ranges, creating a segmented approach to broadband sound absorption that covers low, mid, and high frequencies effectively.
Solution Approach 2:
The patent applies dimensionality change by transitioning from single-scale to multi-level and multi-scale pore structures. This adds complexity in the pore size dimension, creating a hierarchical structure that enhances sound absorption across different frequency dimensions, thereby expanding the adaptability and versatility of the 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 material achieves balanced broadband sound absorption with adjustable frequency range, low bulk density, and high flexural strength, while utilizing industrial waste and reducing energy consumption and production time.
Implementation Method 1
expanded perlite forms primary pores with sizes of 20-200 μm
Implementation Method 2
hydrogen peroxide foaming forms secondary pores with sizes of ≤20 μm
Implementation Method 3
physical foaming forms multi-level pores with sizes of 200-1500 μm
Implementation Method 4
constructs a multi-level and multi-scale pore structure system... achieves balanced broadband sound absorption performance
Data Source
AI summary
An efficient sound-absorbing lightweight aggregate cellular concrete, a method for preparing the same, and an application thereof. The concrete comprises: 85-95 parts by weight of low-carbon sulfur-aluminum-ferric cementitious materials, 5-15 parts by weight of supplementary cementitious material, 0.6-1.5 parts by weight of functional admixture, 20-60 parts by weight of non-sintered lightweight aggregate, 0.35-0.45 parts by weight of water, and 0.5-1.5 L of preformed foam. The non-sintered lightweight aggregate includes cementitious materials, byproduct gypsum, hydrogen peroxide, water, and expanded perlite. A multi-level pore structure is constructed from expanded perlite pores, hydrogen peroxide foaming pores, and physical foaming pores. The material exhibits a noise reduction coefficient ≥0.80, a bulk density≤500 kg/m3, and a flexural strength ≥1.5 MPa.