Bentonite Modifier for Cement Permeation Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cement and concrete products face issues with permeation and salt corrosion due to the inability of bentonite to form effective fusion zones with hydrated minerals, leading to separation and weakened cementing properties, and the use of industrial waste residues degrades performance, while recycled ash from dry-process rotary kilns poses composition challenges in cement production.
Innovation Solution
A bentonite modifier comprising a water-soluble thiosulfate, alcohol compound, and amine compound is used to enhance bentonite's performance in cement, combined with a texturizer of active silica powder and water reducer to create a cement additive that resists permeation and salt corrosion, and recycled ash is modified and used as a substituted slag powder to improve cement production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bentonite is blended into cement or concrete as waterproof additives, then water swelling capacity and dispersion property are improved, but separation from hydrated minerals and formation of dried-up channels occur due to untimely full-expansion
Solution Approach 1:
The bentonite is pre-modified with organic compounds and metal salts before being blended into cement, creating a modified bentonite that controls its expansion timing. This preliminary treatment ensures the bentonite does not expand too early and separate from hydrated minerals, while still maintaining its waterproofing function when needed.
Solution Approach 2:
Organic compounds and metal salts are introduced as intermediary substances that modify the bentonite surface and control its interaction with cement hydrated minerals. These intermediaries regulate the expansion behavior of bentonite, preventing premature separation while maintaining homogeneous distribution in the cement matrix.
2Ease of operation
If non-modified or modified bentonite is used in cement concrete, then dispersion and suspension property are improved, but cementing property is weakened by clay minerals
Solution Approach 1:
The chemical composition and surface properties of bentonite are modified through treatment with organic compounds and metal salts. This changes the parameters of bentonite to reduce its negative impact on cementing property while preserving its dispersion and suspension characteristics in cement concrete.
Solution Approach 2:
A composite material is created by combining bentonite with organic compounds and metal salts to form modified bentonite. This composite maintains the advantageous dispersion properties of bentonite while mitigating its harmful effect on cementing property through the synergistic interaction of its components.
3Ease of manufacture
If industrial waste residue is added to cement to lower production cost, then production cost is reduced, but surface energy is low and association capacity with water is poor leading to rapid water loss
Solution Approach 1:
Organic compounds act as intermediary substances that modify the surface properties of industrial waste residue particles. These intermediaries increase the surface energy and water association capacity of the waste residue, enabling it to retain water effectively while maintaining the cost advantage of using industrial waste material.
4Productivity
If recycled ash from dry-process rotary kiln is used as substituted slag powder, then production cost is reduced and productivity is improved, but composition control becomes challenging
Solution Approach 1:
The composition parameters of recycled ash are optimized and controlled through selective processing and blending techniques. This allows the recycled ash to be used as substituted slag powder with consistent composition, ensuring stable cement quality while maintaining high productivity and reduced production costs.
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 modified bentonite additive improves the strength and resistance to permeation and salt corrosion of cement concrete, while the use of recycled ash reduces production costs and stabilizes cement quality, effectively addressing the challenges of permeation, salt corrosion, and sugaring in cement concrete.
Implementation Method 1
A bentonite modifier comprising a water-soluble thiosulfate, an alcohol compound and an amine compound, wherein, by weight, the thiosulfate to the alcohol compound to the amine compound is (0.3-1):(0.3-1):(0.3-1)
Implementation Method 2
bentonite has a series of physicochemical properties such as water absorbability, swelling capacity, dispersion and suspension property, cohesiveness, the absorbability of organics, catalytic activity, thixotropy, plasticity, lubricity and cation exchange capacity
Implementation Method 3
a method for manufacturing cement using recycled ash from the dry-process rotary kiln as a substituted slag powder
Data Source
AI summary
The present disclosure relates to a bentonite modifier, comprising a water-soluble thiosulfate, a water-soluble alcohol compound, and a water-soluble amine compound, wherein the amounts of thiosulfate, the alcohol compound, and the amine compound are in the ratio of (0.3˜1):(0.3˜1):(0.3˜1). The present disclosure further relates to a bentonite-containing cement additive capable of resisting permeation and salt corrosion, comprising bentonite and said modifier, wherein the content of the bentonite modifier is 0.2˜5% of the bentonite by weight. Meanwhile, the present disclosure also provides use of the modified bentonite.