Sand Clay Analysis Using Colorimetric Intercalation

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Solution Overview

Problem

The presence of sodium clays like Montmorillonite in sands affects the workability of hydraulic binder compositions by absorbing water and intercalating superplasticizers, leading to increased viscosity and a requirement for over-dosing of superplasticizer to maintain workability, which existing methods like the methylene blue test fail to address selectively.

Innovation Solution

A colorimetric method using compounds of formula (I) to determine the quantity of superplasticizer-consuming clays by intercalating into their sheets, allowing prediction of Clay Mitigation Agent (CMA) dosage through color intensity changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the methylene blue test is used to determine clay quantity, then the analysis can be performed, but it is not selective for problematic clays and is sensitive to sand fines

Engineering Contradiction:

Improveclay quantity measurementVSAvoidselectivity for superplasticizer-consuming clays

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent uses a specific indicator compound (methylene blue or alternative dyes) as an intermediary that selectively interacts with problematic clays. The indicator compound intercalates into the clay sheets and produces a color change proportional to the clay content, enabling selective detection of superplasticizer-consuming clays while being insensitive to sand fines

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs colorimetric detection where the indicator compound changes color upon intercalation with clay. The intensity of the color change is directly proportional to the clay content, allowing for precise and selective measurement of problematic clays that consume superplasticizers

Inventive Principle:

Principle #32Color changes

2Reliability

If superplasticizer dosage is increased to offset clay consumption, then workability is maintained, but superplasticizer is over-dosed and resources are wasted

Engineering Contradiction:

Improveworkability maintenanceVSAvoidsuperplasticizer consumption

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent performs a preliminary colorimetric analysis of the sand to determine the exact clay content before concrete mixing. This advance knowledge allows for precise calculation and dosing of superplasticizer, preventing both under-dosing (which would compromise workability) and over-dosing (which would waste resources)

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent establishes a feedback loop where the clay content measured by the colorimetric test directly informs the superplasticizer dosage decision. The measurement results provide real-time information that adjusts the chemical dosing, optimizing resource usage while ensuring workability requirements are met

Inventive Principle:

Principle #23Feedback

3Ease of operation

If a simple on-site analysis method is used, then ease of operation is improved, but measurement precision may be compromised

Engineering Contradiction:

Improveon-site analysis capabilityVSAvoidclay content determination accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent replaces complex mechanical or laboratory-based clay analysis systems with a simple colorimetric test that can be performed on-site. The method uses visual color comparison or simple photometric measurement, eliminating the need for sophisticated equipment while maintaining sufficient measurement precision for practical dosing decisions

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs inexpensive, single-use indicator compounds and simple test procedures that can be quickly deployed on-site. The disposable nature of the test reagents and the simplicity of the procedure enable frequent, rapid clay content assessment without requiring expensive, maintained equipment

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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

Enables accurate determination of clay content and prediction of superplasticizer or CMA dosage, effectively maintaining workability by offsetting the negative effects of clays on hydraulic binder compositions.

Implementation Method 1

the formula (I) compounds of the invention intercalate into the sheets of clays. This intercalation of the formula (I) compounds translates as reduced intensity of the colour of the coloured compound

Methodology Applied

Scientific EffectIntercalation: Absorption (physical)

Implementation Method 2

by coloured compound it is meant any type of compound having radiation adsorption with wavelengths belonging to the visible range

Methodology Applied

Scientific EffectAbsorption of electromagnetic radiation: Absorption (EM radiation)

Data Source

PatentUS12529691B2Method for analysing the quantity of clay in a sand

Publication Date: 2026.01.20 STARCIN HOLDING FRANCE

AI summary

Disclosed is use of a compound of formula (I) to determine the quantity of clay in a sand and/or to determine the amount of CMA compound to be added to a hydraulic binder composition using a sand:R1—(OA)n—XR2 (I)where: R1 is a linear or branched C1 to C4 alkyl groups, or a coloured compound; R2 is a coloured compound; A, each the same or different, are independently a —CH2—CH2— group or —CH(CH3)—CH2— group; n is an integer of between 1 and 500, preferably between 4 and 250; and X is O or NH.