Gypsum Cement Aggregate Stabilizer for Slurry Sedation

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Solution Overview

Problem

Existing gypsum cement compositions struggle to maintain aggregate suspension and prevent sedimentation, leading to issues with surface water balance and finished floor adhesion during the setting of pourable floor slurries.

Innovation Solution

A calcium sulfate hemi-hydrate/cement composition incorporating an aggregate stabilizing mixture of polysaccharide gums, such as xanthan and diutan gum, and a polyacrylamide-gelatin blend, along with polyethylene glycol, to stabilize aggregates in suspension and achieve optimal surface water balance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If sand and aggregates are added to pourable floor slurry, then the strength and structural integrity of the floor are improved, but the aggregate sediments and separates from the slurry during pumping and setting

Engineering Contradiction:

Improvefloor strengthVSAvoidslurry homogeneity

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

The patent introduces an aggregate stabilizer as an intermediary substance that mediates between the aggregate particles and the slurry matrix. This stabilizer, applied to the aggregate surface, creates a protective interface that prevents direct interaction between aggregates and slurry that would lead to sedimentation, while still allowing the aggregate to provide structural strength.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite material system where aggregate particles are combined with an organic binder and dispersant to form a stabilized aggregate structure. This composite approach allows the aggregate to maintain its strength-providing function while the binder and dispersant components prevent sedimentation and maintain slurry homogeneity.

Inventive Principle:

Principle #40Composite materials

2Shape

If water is added to the surface of setting slurry, then the surface finish is improved, but water bleeds from the slurry causing voids and poor adhesion

Engineering Contradiction:

Improvesurface finishVSAvoidsurface water balance

Core Design Contradiction:

ShapeVSStability of the object's composition

Solution Approach 1:

The aggregate stabilizer acts as an intermediary that controls water movement at the aggregate-slush interface. It prevents excessive water from migrating to the surface while still allowing sufficient moisture for proper setting and finish, thereby maintaining surface water balance.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the rheological parameters of the slurry by introducing the aggregate stabilizer with its specific viscosity and surfactant properties. This modifies the water-cement ratio dynamics and controls the rate and amount of water bleeding, preventing void formation while maintaining adequate surface moisture.

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If dispersant is added to the slurry, then aggregate suspension is improved, but the dispersant rises with water to the surface making it sticky and difficult to finish

Engineering Contradiction:

Improveaggregate suspensionVSAvoidsurface quality

Core Design Contradiction:

Stability of the object's compositionVSShape

Solution Approach 1:

The aggregate stabilizer serves as a superior intermediary that remains primarily at the aggregate-slush interface rather than migrating to the surface. It performs the dispersant function of maintaining aggregate suspension while its molecular structure and positioning prevent it from rising with bleed water to contaminate the surface.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies the stabilizer locally at the aggregate surface rather than having it uniformly distributed throughout the slurry. This localized application ensures the dispersant effect is concentrated where needed for suspension stability, while minimizing the presence of dispersant materials at the surface that would cause stickiness.

Inventive Principle:

Principle #3Local quality

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 effectively stabilizes aggregates in suspension, extends the workability of gypsum cement slurries, and maintains an optimal surface water balance during the hardening process, improving the finish and wear resistance of the floor.

Implementation Method 1

The technical advantages are attributed to the synergistic effect of a polysaccharide gum in combination with a polyacrylamide-gelatin blend. The technical advantages include stabilization of aggregate in suspension

Methodology Applied

Scientific EffectViscosity: Viscometer

Implementation Method 2

the aggregate stabilizing mixture comprises: a polysaccharide gum in an amount from 0.001% to 0.5% by weight of the composition, and a polyacrylamide-gelatin blend in an amount from 0.00125% to 0.01% by weight of the composition

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS12291485B2Gypsum cement compositions with aggregate stabilizers and methods for forming floor underlayment

Publication Date: 2025.05.06 KNAUF GIPS KG

AI summary

This disclosure provides gypsum cement compositions which comprise an aggregate stabilizing mixture containing a combination of a polysaccharide gum and a polyacrylamide-gelatin blend, and methods for making and using these compositions, including pourable/pumpable floor underlayment slurries and methods for forming high strength underlayment on different substrates.