Lightweight Concrete Compositions with Optimized Polymer Particle Density
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Solution Overview
Problem
Existing lightweight concrete compositions often have inconsistent physical properties such as Young's modulus, thermal conductivity, and compressive strength, and typically demonstrate less than desirable structural integrity due to the use of expanded polymers which compromise strength for reduced weight.
Innovation Solution
A lightweight concrete composition is developed with a specific range of cement and expanded polymer particles, optimized in size, density, and distribution to achieve a compressive strength of at least 1700 psi after seven days, using a mixture that includes 10-90 volume percent cement, 10-90 volume percent polymer particles with controlled bulk density and aspect ratio, and 0-50 volume percent aggregate, ensuring predictable and desirable physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If expanded polymer particles are used to reduce weight, then weight is reduced, but compressive strength and structural integrity deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the bulk density (0.028-0.64 g/cc) and aspect ratio (1-3) of expanded polymer particles, and optimizing their volume percentage (10-90%) in the cement composition. This systematic parameter optimization resolves the contradiction by finding the optimal balance point where weight reduction is achieved while maintaining compressive strength above 1700 psi.
Solution Approach 2:
The patent creates a composite material system combining cement (10-90 volume percent), expanded polymer particles (10-90 volume percent), and aggregate (0-50 volume percent). This composite approach allows the synergistic interaction between materials, where the cement matrix provides strength while the expanded polymer provides weight reduction, achieving both lightweight and high-strength properties simultaneously.
2Weight of stationary object
If expanded polymers are used in concrete, then weight is reduced, but physical property consistency deteriorates
Solution Approach 1:
The patent establishes specific parameter ranges for expanded polymer particles including bulk density (0.028-0.64 g/cc), aspect ratio (1-3), and particle size distribution. By controlling these parameters within defined ranges and maintaining consistent mixing procedures, the patent achieves both weight reduction and improved consistency in physical properties such as compressive strength, Young's modulus, and thermal conductivity.
Solution Approach 2:
The patent promotes homogeneity by carefully controlling the distribution of expanded polymer particles throughout the cement matrix. The specified aspect ratio range (1-3) and volume percentage (10-90%) ensure uniform dispersion, while the mixing and curing procedures maintain consistent composition throughout the concrete mass, resulting in predictable and consistent physical properties.
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 composition achieves a consistent and enhanced compressive strength of at least 1700 psi, providing improved structural integrity and predictable physical properties while maintaining a lightweight characteristic, suitable for various construction applications.
Implementation Method 1
A lightweight concrete composition containing from 10 to 90 volume percent of a cement composition, from 10 to 90 volume percent of particles having an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.028 g/cc to 0.64 g/cc
Data Source
AI summary
A lightweight concrete composition containing from 10 to 90 volume percent of a cement composition, from 10 to 90 volume percent of particles having an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.03 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3, and from 0 to 50 volume percent of aggregate; where the sum of components used does not exceed 100 volume percent, and where after the lightweight concrete composition is set it has a compressive strength of at least 1700 psi as tested according to ASTM C39 after seven days. The concrete composition can be used to make concrete masonry units, construction panels, road beds and other articles.