1. Кальцийн хөнгөн цагааны цементийн бүтэц, чийгшлийн хими
1.1 Үндсэн үе шатууд ба түүхий эдийн эх үүсвэрүүд
(Кальцийн хөнгөн цагаан бетон)
Кальцийн хөнгөн цагаан бетон (CAC) is a customized building product based on calcium aluminate cement (CAC), which differs essentially from ordinary Rose city cement (OPC) in both composition and performance.
The main binding stage in CAC is monocalcium aluminate (CaO · Al ₂ O Four or CA), usually constituting 40– 60% клинкерийн, along with various other stages such as dodecacalcium hepta-aluminate (C ₁₂ A ₇), кальцийн диалюминат (CA ₂), and minor quantities of tetracalcium trialuminate sulfate (C FOUR AS).
These stages are generated by merging high-purity bauxite (хөнгөн цагаанаар баялаг хүдэр) and limestone in electric arc or rotary kilns at temperature levels between 1300 ° C ба 1600 ° C, leading to a clinker that is subsequently ground right into a fine powder.
The use of bauxite guarantees a high aluminum oxide (Аль хоёр О ХОЁР) агуулга– ихэвчлэн хооронд 35% ба 80%– which is necessary for the product’s refractory and chemical resistance buildings.
OPC-ээс ялгаатай, which relies upon calcium silicate hydrates (C-S-H) for stamina growth, CAC gains its mechanical homes with the hydration of calcium aluminate stages, developing a distinct set of hydrates with premium efficiency in hostile environments.
1.2 Hydration Mechanism and Toughness Advancement
The hydration of calcium aluminate concrete is a facility, temperature-sensitive procedure that leads to the development of metastable and steady hydrates in time.
At temperature levels listed below 20 ° C, CA нь CAH ₁₀-ийг хөгжүүлэхийн тулд чийгшүүлнэ (кальцийн алюминат декахидрат) and C TWO AH ₈ (дикальциум алюминат октагидрат), which are metastable phases that offer rapid very early toughness– often attaining 50 МПа дотор 1 өдөр.
Гэсэн хэдий ч, at temperatures over 25– 30 ° C, these metastable hydrates undergo a transformation to the thermodynamically secure stage, C ₃ AH ₆ (гидрогарнет), болон аморф хөнгөн жинтэй хөнгөн цагааны гидроксид (AH SIX), a process referred to as conversion.
This conversion lowers the solid quantity of the moisturized phases, raising porosity and potentially damaging the concrete otherwise appropriately taken care of throughout curing and service.
The price and extent of conversion are influenced by water-to-cement proportion, healing temperature, and the visibility of additives such as silica fume or microsilica, which can alleviate strength loss by refining pore framework and promoting second responses.
Despite the danger of conversion, the rapid stamina gain and early demolding ability make CAC suitable for precast components and emergency situation repair work in industrial setups.
( Кальцийн хөнгөн цагаан бетон)
2. Physical and Mechanical Characteristics Under Extreme Conditions
2.1 Өндөр температурын гүйцэтгэл ба галд тэсвэртэй байдал
One of the most defining features of calcium aluminate concrete is its ability to stand up to extreme thermal conditions, making it a recommended selection for refractory cellular linings in commercial heaters, зуух, and incinerators.
Халах үед, CAC undergoes a collection of dehydration and sintering responses: hydrates decompose between 100 ° C ба 300 ° C, followed by the formation of intermediate crystalline phases such as CA ₂ and melilite (гехленит) дууссан 1000 ° C.
Температурын түвшингээс давсан үед 1300 ° C, a dense ceramic framework types through liquid-phase sintering, causing significant toughness recuperation and quantity security.
This habits contrasts dramatically with OPC-based concrete, which generally spalls or breaks down over 300 ° C as a result of vapor stress buildup and decomposition of C-S-H phases.
CAC-based concretes can maintain continual solution temperature levels approximately 1400 ° C, relying on aggregate type and solution, and are frequently made use of in combination with refractory accumulations like calcined bauxite, chamotte, эсвэл дулааны цохилтын эсэргүүцлийг сайжруулахын тулд муллит.
2.2 Resistance to Chemical Strike and Rust
Calcium aluminate concrete exhibits outstanding resistance to a wide variety of chemical settings, specifically acidic and sulfate-rich problems where OPC would swiftly degrade.
The moisturized aluminate phases are more steady in low-pH atmospheres, enabling CAC to withstand acid strike from sources such as sulfuric, давстай, болон органик хүчил– common in wastewater therapy plants, chemical processing facilities, болон уул уурхайн үйл ажиллагаа.
It is additionally very immune to sulfate assault, a significant root cause of OPC concrete damage in soils and aquatic environments, because of the lack of calcium hydroxide (Портлэндерс) болон эттрингит үүсэх үе шатууд.
Цаашлаад, CAC shows low solubility in seawater and resistance to chloride ion infiltration, decreasing the danger of support rust in hostile marine settings.
These residential or commercial properties make it ideal for linings in biogas digesters, pulp and paper market tanks, and flue gas desulfurization systems where both chemical and thermal stresses exist.
3. Microstructure and Durability Qualities
3.1 Pore Structure and Permeability
The sturdiness of calcium aluminate concrete is very closely linked to its microstructure, specifically its pore dimension distribution and connection.
Fresh moisturized CAC displays a finer pore framework compared to OPC, with gel pores and capillary pores adding to lower leaks in the structure and boosted resistance to aggressive ion ingress.
Гэсэн хэдий ч, as conversion advances, the coarsening of pore structure because of the densification of C THREE AH ₆ can enhance permeability if the concrete is not effectively healed or protected.
The addition of reactive aluminosilicate products, үнс эсвэл метакаолин гэх мэт, can improve long-lasting longevity by eating totally free lime and developing extra calcium aluminosilicate hydrate (C-A-S-H) phases that refine the microstructure.
Appropriate healing– specifically moist curing at regulated temperatures– is vital to postpone conversion and allow for the growth of a thick, нэвтэршгүй матриц.
3.2 Дулааны цочрол ба задралын эсэргүүцэл
Thermal shock resistance is an important efficiency metric for products made use of in cyclic home heating and cooling atmospheres.
Кальцийн хөнгөн цагаан бетон, particularly when developed with low-cement content and high refractory accumulation volume, exhibits exceptional resistance to thermal spalling due to its reduced coefficient of thermal expansion and high thermal conductivity relative to other refractory concretes.
The presence of microcracks and interconnected porosity permits anxiety leisure throughout quick temperature level adjustments, protecting against tragic crack.
Шилэн дэмжлэг– using steel, полипропилен, or basalt fibers– more boosts sturdiness and split resistance, specifically throughout the first heat-up stage of commercial linings.
These features guarantee long service life in applications such as ladle cellular linings in steelmaking, rotating kilns in concrete manufacturing, болон нефтийн химийн жигнэмэг.
4. Industrial Applications and Future Development Trends
4.1 Key Markets and Architectural Utilizes
Calcium aluminate concrete is important in industries where conventional concrete stops working because of thermal or chemical exposure.
In the steel and foundry sectors, it is used for monolithic linings in ladles, ангиудад, ба ханасан нүхнүүд, where it stands up to liquified steel call and thermal cycling.
Хог хаягдлыг шатаах үйлдвэрүүдэд, CAC-based refractory castables secure boiler wall surfaces from acidic flue gases and unpleasant fly ash at elevated temperature levels.
Community wastewater framework utilizes CAC for manholes, pump terminals, биоген хүхрийн хүчилд өртсөн бохирын хоолой, considerably expanding life span contrasted to OPC.
It is likewise utilized in fast repair service systems for freeways, гүүрнүүд, and airport runways, where its fast-setting nature allows for same-day resuming to website traffic.
4.2 Тогтвортой байдал ба дэвшилтэт томъёолол
Regardless of its performance benefits, the production of calcium aluminate cement is energy-intensive and has a greater carbon footprint than OPC because of high-temperature clinkering.
Continuous study focuses on decreasing environmental effect via partial replacement with industrial spin-offs, such as aluminum dross or slag, and optimizing kiln effectiveness.
New formulas integrating nanomaterials, нано-хөнгөн цагаан эсвэл нүүрстөрөгчийн нано хоолой гэх мэт, objective to boost early strength, lower conversion-related destruction, and expand solution temperature restrictions.
Нэмж хэлэхэд, the growth of low-cement and ultra-low-cement refractory castables (ULCCs) improves density, strength, and durability by minimizing the quantity of responsive matrix while making the most of accumulated interlock.
As commercial procedures demand ever extra resistant products, calcium aluminate concrete continues to advance as a cornerstone of high-performance, resilient building and construction in the most difficult environments.
Товчхондоо, calcium aluminate concrete combines quick stamina advancement, high-temperature security, ба химийн гайхалтай эсэргүүцэл, making it an important material for facilities subjected to extreme thermal and harsh problems.
Its unique hydration chemistry and microstructural development require careful handling and style, however when effectively applied, it supplies unparalleled toughness and safety and security in commercial applications around the world.
5. Үйлчилгээ үзүүлэгч
Cabr-Concrete нь кальцийн хөнгөн цагааны цементийн TRUNNANO-ийн дор нийлүүлэгч юм 12 нано барилгын эрчим хүч хэмнэх, нанотехнологийг хөгжүүлэх чиглэлээр олон жилийн туршлагатай. Энэ нь зээлийн картаар төлбөрийг хүлээн авдаг, Т/Т, West Union болон Paypal. TRUNNANO нь бараагаа FedEx-ээр дамжуулан гадаад дахь үйлчлүүлэгчдэд хүргэх болно, DHL, агаараар, эсвэл далайгаар. Хэрэв та хайж байгаа бол хөнгөн цагааны цемент, Бидэнтэй холбоо барьж, лавлагаа илгээнэ үү. (
Шошго: кальцийн алюминат,кальцийн алюминат,хөнгөн цагааны цемент
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