Foam concrete is a kind of concrete with lightweight and has ideal strength. Because of the hollow structure in foam concrete, it has the function of absorbing heat and isolating sound.
The density of foamed concrete is 300-1200 kg/m3, and the thermal conductivity is between 0.08-0.3W/ (m ·K).
Foam concrete is widely used in CLC blocks, lightweight partition panels, roof insulation, floor cushion construction, floor heating backfilling, and other occasions.
At the same time, foam concrete is also a good sound absorption material, which can be used in highway sound insulation boards, sound absorption boards, and other fields.
Generally speaking, foam concrete is a kind of building material with multi-function, environmental protection, and economy, which has a wide application prospect.
What is Early Strength Agent?
The admixture that can accelerate the development of concrete early strength is called early strength agent.
Different Types of Early Strength Agents
Strong electrolyte inorganic salts, such as sulfate, sulfate double salt, nitrate, nitrite, chloride salt, etc.
Water-soluble organic compounds, such as triethanolamine, formate, acetate, propionate, etc.
Others such as organic compounds and inorganic salt compounds;
Early strength water reducing agent made of early strength agent and water reducing agent.
Application Ranges of Early Strength Agents
Early strength agent early strength water reducing agent is suitable for steam curing concrete and normal temperature, low temperature and minimum temperature is not less than -5℃ environment construction of early strength requirements of concrete engineering.
Early strength agents, as well as early strength water reducing agent, should not be used in hot environments.
Chemical substances that are harmful to human body or pollute the environment after being mixed into concrete are strictly prohibited to be used as early strength agents, and admixtures containing ammonium nitrate are strictly prohibited to be used in office, residential and other construction projects.
Early strength agent and early strength water reducing agent containing chlorine salt are strictly prohibited in the following structures:
Prestressed concrete structure;
Structure used in the environment with relative humidity greater than 80%, the structure in the changing part of water level, the open-air structure and the structure often subjected to water and water erosion;
Mass concrete;
Structures in direct contact with acids, bases or other aggressive media;
Structures that are often in an environment where the temperature is above 60℃ and must be prefabricated reinforced concrete members by steam curing;
Concrete with decorative requirements, especially those requiring consistent color or metal decoration on the surface;
Thin-walled concrete structure;
Concrete structures in which aggregate has alkali activity.
In the following concrete structures, it is strictly prohibited to use early strength agent and early strength water reducing agent containing strong electrolytes and inorganic salts:
Structures in contact with galvanized steel or aluminum-iron, and structures with exposed steel bars and embedded iron without protective measures;
Structure using DC power supply and the structure within 100m from high voltage DC power supply.
Early strength agent containing potassium and sodium ion is used in concrete structure with alkali activity of aggregate, the alkali content of early strength agent should not exceed 1kg/m, and the total alkali content of concrete should conform to the provisions of the standard.
Concrete Additives Supplier
TRUNNANO is a reliable concrete additives supplier with over 12-year experience in nano-building energy conservation and nanotechnology development.
If you are looking for high-quality concrete early strength agents, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com)
We accept payment via Credit Card, T/T, West Union, and Paypal. TRUNNANO will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.
Definition:
Accelerating agent is to point to the admixture that can make concrete condenses quickly after concrete hardening.
Early strength agent refers to the admixture which can improve the early strength of concrete and has no significant effect on the late strength.
Classification:
The main types of accelerating agent:
alkali earth metal carbonate and alkali earth metal hydroxide, silicate alkali (sodium silicate) sodium silicate, potassium silicate accelerating agent, sodium aluminate, potassium aluminate accelerating agent, alkali free liquid accelerating agent.
Early strength agents can be divided into:
strong electrolyte inorganic salts, water-soluble organic compounds, organic and inorganic compound early strength agents according to their chemical composition.
Main ingredients
The main ingredient of accelerating agent is aluminum oxide clinker (namely bauxite, soda, quicklime according to the proportion of the clinker fired) by grinding and made.
Early strength agent in addition to chlorine salt and sulfate nitrite, chromate and other organic compounds such as triethanolamine, calcium formate, urea and so on.
Uses
Accelerating agent dosage accounts for only 4% ~ 6% of cement dosage in concrete, but can make concrete in 5min initial coagulation, 10min final coagulation. In order to achieve the purpose of rush repair or fast condensation of concrete in the tunnel. It is an indispensable additive in shotcrete construction method. Their function is to speed up the hydration and hardening of cement, forming sufficient strength in a very short period of time to ensure the requirements of special construction.
Early strength agent does not contain chloride ion, no corrosion of steel bar, applicable to all civil and industrial buildings and prestressed reinforced concrete members, mortar and so on. It is most suitable for construction under low temperature in early winter and early spring. Used in Portland cement, slag cement is particularly significant in strengthening and modifying.
Note:
Accelerating agent should not be added while material is mixed, because stones, sand contains a lot of water, accelerating agent in a short time of water absorption in the non-spraying decomposition of its rapid setting components, affecting the setting time, reducing the strength of concrete, it will lead to the adverse effect of spraying concrete. Before use, the cement used in the project should be tested, and the dosage can be used in large quantities.
Early strength agent dosage is 3-6% of cement. In order to keep the quality of concrete mixed with this agent uniform, mixing time to extend 1-2 minutes. Concrete mixed with early strength agent cannot use orthopedic active minerals (such as opal). If problems such as damp agglomerate arise, the agent must be crushed or weathered, and its performance will be unchanged.
Concrete Additives Supplier
TRUNNANO is a reliable concrete additives supplier with over 12-year experience in nano-building energy conservation and nanotechnology development.
If you are looking for high-quality concrete early strength agents and accelerator, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com)
We accept payment via Credit Card, T/T, West Union, and Paypal. TRUNNANO will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.
What is Early Strength Agent?
Early strength agent is an admixture which accelerates the development of concrete early strength and has no significant effect on later strength.
Under the premise of ensuring the quality of concrete, early strength agent can greatly shorten its final setting time, make it as early as possible, and then accelerate the turnover of template, save template dosage, save energy and save cement, reduce production costs, and improve the output of concrete products.
The cement in the concrete used in construction takes a long time to set and harden before it reaches strength. But in some large engineering concrete precast components or in the cold season construction, often need in a short time to obtain higher strength. Therefore, in the process of concrete mixing, it is common to add early strength agent to achieve the purpose of hardening in a short time.
Early strength agent can greatly improve the strength of cement slurry, mortar and concrete. Adding early strength agent into concrete mixture not only ensures the effect of reducing water, strengthening and compacting of concrete, but also gives full play to the advantage of early strength agent. Adding early strength agent into concrete can ensure the quality of concrete and improve the progress of the project, greatly simplify and reduce the requirements for curing conditions.
Role of Early Strength Agents:
1. Make concrete in a short time to achieve higher strength, to meet the requirements of bearing external forces.
2. When the temperature is low, the hardening strength of mortar is slower, especially in some frozen soil, the lower the strength of mortar is more harmful to mortar, if mortar is damaged by freezing will cause permanent damage to mortar, so early strength agent must be added at lower temperature.
Difference between Early Strength Agents and Early Strength Water Reducing Agents:
Early strength agents added to concrete can harden cement in a short time, especially in low-temperature environments, the role of this product is more obvious. The role of early strength water reducing agent is to reduce water in concrete.
Concrete Additives Supplier
TRUNNANO is a reliable concrete additives supplier with over 12-year experience in nano-building energy conservation and nanotechnology development.
If you are looking for high-quality concrete early strength agents, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com)
We accept payment via Credit Card, T/T, West Union, and Paypal. TRUNNANO will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.
What is polycarboxylic acid superplasticizer?
As an admixture, concrete superplasticizer is added to concrete to reduce water consumption and increase the strength of concrete. At present, the high-performance water-reducing agents used in concrete engineering are mainly polycarboxylic acid superplasticizer products.
1. Features of high performance water reducing agent concrete
(1) High water reduction rate. Under the same slump, the water reducing rate of high-performance water reducing agent is relatively high, and its water reducing rate is generally above 35%. Due to the high water-reducing rate of the water-reducing agent, the water consumption of concrete is greatly reduced. When calculating the parameters of the water reducing agent, it should be calculated according to 0.25% of the cement amount, and high-performance concrete can be prepared by increasing the amount of admixtures.
(2) Good liquidity. Generally speaking, in the application process of high-performance water reducer, the flow performance will not deteriorate, which is beneficial to reduce the occurrence of concrete segregation or tube pump blockage. To ensure the performance of the concrete mixture, the water reducing agent should be selected according to the variety of cement to ensure the quality of the construction project.
(3) The strength of the mixture is improved. Adding water reducing agents (such as slag, fly ash, etc.) to concrete can improve the strength of the mixture. In the case of ensuring the stability of the cement dosage, adding a high-performance water reducer to the concrete can increase the strength of the concrete to more than 70%.
(4) The total alkali content is low. Adding an appropriate amount of high-performance water reducer to concrete will reduce the alkali content of concrete, reduce the incidence of alkali-aggregate reaction to a certain extent, and improve the durability of concrete.
(5) The shrinkage is lower. Since the performance of polycarboxylate water reducer is relatively good, it can ensure the quality of formula raw materials in the selection of raw materials. In addition, the total alkali content of the water reducing agent is low, which is conducive to maintaining the stability of the concrete and preventing the occurrence of concrete cracks.
2. Types of high performance superplasticizers
High-performance water reducers are mainly divided into three types: slump-preserving type, functional type and shrinkage-reducing type. These types are briefly described below.
(1) Collapse protection type. The slump-preserving water-reducing agent is generally used in the development of concrete. By adding this type of water-reducing agent, the slump of concrete can be ensured and the fluidity of concrete can be reasonably controlled.
(2) Functional type. The functional type of water reducing agent is mainly divided into two functions, one is early strength type and the other is retarded type. Among them, the early-strength water-reducing agent can make the concrete meet the exothermic requirements in the early stage and promote the coagulation of the concrete, which is beneficial to the construction of the concrete in winter. However, the application of retarder water reducing agent in concrete mainly reflects the ability to maintain the concrete state, so as to facilitate the repair of concrete in the later stage. However, if these two water reducers are used in combination, they can play a role in retarding the setting of cement.
(3) Reduced type. The shrinkage-reducing type of the water-reducing agent is mainly synthesized by esterification, which not only has a certain water-reducing effect and shrinkage-reducing function, but also fully exerts the water-reducing effect of concrete.
TRUNNANO is a concrete additives supplier with over 12 years experience in nano-building energy conservation and nanotechnology development. We accept payment via Credit Card, T/T, West Union and Paypal. Trunnano will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.
If you are looking for high quality superplasticizer, please feel free to contact us and send an inquiry.
sales@cabr-concrete.com
Ask a quote for the latest price and one of our team members will respond as soon as possible. Fields marked with * are required.
