SPECIAL CEMENT

Overview of Special Cement

Special concretes are ranges of concrete designed to fulfill details building and construction requirements that ordinary  cement  might not fulfill. These concretes are crafted to deal with particular obstacles such as heats, aggressive chemical environments, fast setting times, or boosted sturdiness. They include types like white cement, rapid-hardening concrete, expansive concrete, sulfate-resisting cement, and low-heat cement, to name a few.

Features of Special Cement

Resistance to Chemical Assault: Particular cements, like sulfate-resisting concrete, are formulated to resist attack from sulfates and various other destructive substances located in dirt and groundwater.
Thermal Stability: Low-heat cements produce marginal warm during hydration, making them appropriate for mass concreting where thermal breaking is a concern.
Fast Solidifying: Kinds like fast-setting cements can achieve very early strength swiftly, minimizing the waiting period in between positioning and more construction tasks.
Improved Durability: Special cements can improve the longevity of concrete structures, particularly in extreme environments, by offering far better resistance to weathering, abrasion, and disintegration.
Esthetic Charm: White concrete and tinted cements are made use of for decorative objectives, enabling the creation of aesthetically appealing concrete surfaces.
Low Alkali Content: Some unique cements have low antacids material to lessen the danger of alkali-silica reaction (ASR), which can create expansion and fracturing in concrete.

Applications of Special Cement

Framework Development: Sulfate-resisting and low-heat concretes are perfect for bridge structures, tunnels, and huge dams where chemical resistance and thermal control are crucial.
High-Strength Concrete: Rapid-hardening concretes are utilized in precast concrete aspects and high-strength concrete applications needing fast turn-around times.
Ornamental Concrete: White cement and colored cements are preferred in architectural tasks for their ability to develop vibrant and distinct designs.
Repair and Reconstruction: Large concretes are made use of in repairing cracks and spaces in existing structures due to their self-compacting nature and capacity to load voids firmly.
Marine Structures: Concretes with high sulfate resistance and low leaks in the structure are utilized in marine environments to secure against chloride-induced deterioration of support.

white cement

Introduction of Sulphoaluminate Gelling Agent 

HML white (ultra-high strength) fast-hardening sulphoaluminate gelling agent is a high-tech product with the performance of sulphoaluminate gelling agent, which is developed on the basis of summarizing and absorbing the performance indicators of fast-hardening sulphoaluminate gelling agent, pure aluminate gelling agent and white silicate gelling agent.

Performance of Sulphoaluminate Gelling Agent 

Physical properties

1. Specific surface area: greater than 400m²/kg

2. Setting time: initial setting 8~20min, final setting 15~40min

3.Strength:

4. This product has low shrinkage and small volume change rate, especially the shrinkage value in the free state is only 10%~12.5% of silicate cementitious materials.

5. High workability: good workability with admixtures, low maintenance difficulty and maintenance cost.

6. Good impermeability and good resistance to sulfate corrosion.

7. Free expansion rate: 1:0.5 lime-sand ratio, 28d free expansion rate 0.00%~0.15%.

Application Scope of Sulphoaluminate Gelling Agent 

At present, the main applications of this product are self-leveling mortar, carving mortar, grindstone mortar, high-strength repair materials, high-strength non-shrinkage grouting materials, grouting reinforcement materials, waterproof plugging materials, GRC and UHPC products.

1. Floor mortar, such as cement-based self-leveling mortar. It can perfectly solve the problems of size change and adhesion of cement-based self-leveling mortar with base concrete.

2. Grinding stone mortar and carving mortar, Belite sulphoaluminate gelling agent has the advantages of early strength, fast hardening, low shrinkage, corrosion resistance, etc., which can perfectly solve the shrinkage problem of grinding stone mortar in application and early strength and corrosion resistance in carving mortar application.

3. Airport runway and highway rapid repair mortar, which reaches the normal use standard in two hours. The road concrete prepared by Belite sulphoaluminate gelling material and early strength agent does not require special maintenance. At the same time, the gelling material has the properties of strong adhesion, high fluidity, rapid curing, micro-expansion, etc., which can effectively prevent concrete shrinkage, and the high anti-permeability can prevent surface water from infiltrating and damaging the road base. Therefore, the material is an ideal base material for road repair, grouting reinforcement, wind turbine base grouting, bridge bearing grouting and other projects.

4. Other civil engineering projects that require early setting and early strength can all be met. sulphoaluminate cementitious materials are widely used in special engineering fields due to their excellent properties such as high early strength, strong anti-permeability, good freeze-thaw resistance, corrosion resistance, short setting time, low alkalinity and low free expansion rate.

Usage and Precautions for Sulphoaluminate Gelling Agent 

During the preparation process, the product must be used in accordance with the factory quality test report or after re-testing.