As an important chemical admixture in modern concrete technology, concrete water reducer plays an essential role in boosting concrete efficiency and enhancing design top quality. Amongst the many kinds of water reducers, naphthalene-based water reducers have actually long inhabited an important setting in engineering practice due to their exceptional cost-effectiveness and stable performance. Nonetheless, with the development of construction technology and the improvement of environmental protection requirements, new water reducers, such as polycarboxylic acid-based water reducers, have actually gradually arised, forming a market pattern that competes with naphthalene-based water reducers This paper aims to give scientific option recommendations for engineering and technological personnel by methodically contrasting the technological attributes and application performance of naphthalene-based water reducers with various other primary types of water reducers and, at the same time, checking out the growth pattern of water reducer technology.
Fundamental characteristics of naphthalene-based water reducers
Naphthalene-based water reducers are high-efficiency water reducers made from naphthalene as the primary raw material with chemical reactions such as sulfonation and condensation. They are anionic surfactants. Inflexible naphthalene rings and hydrophilic sulfonic acid groups identify its molecular framework. This framework allows it to properly adsorb on the surface of concrete fragments and disperse concrete particles via electrostatic repulsion. The water decrease price of naphthalene-based water reducers is normally between 15% and 25%. It has great adaptability and is well-compatible with the majority of concrete.
(concrete superplasticizer)
In design applications, naphthalene-based water reducers have the advantages of low dose sensitivity, good plasticity retention, and moderate price. Nevertheless, its molecular framework determines that it has certain restrictions, such as limited room for water reduction rate improvement and relatively fast depression loss. On top of that, naphthalene-based water reducers might trigger specific environmental pollution throughout the manufacturing procedure, which is also among the essential reasons that its market share has been pressed in recent years.
Evaluation of the features of other major sorts of water reducers.
Polycarboxylic acid-based water reducers are brand-new high-performance water reducers that have established swiftly in recent times. The molecular framework is characterized by grafting several polyoxyethylene side chains on the primary chain to form a “comb-like” framework. This unique framework enables it to achieve the diffusion of concrete particles with the steric limitation result, and the water reduction price can be as high as 30%-40%. Polycarboxylic acid-based water reducers likewise have the features of reduced dosage, good downturn retention, and superb ecological efficiency. They are specifically ideal for high-performance concrete and self-compacting concrete.
Aminosulfonate-based water reducers consist of 2 functional groups, amino and sulfonic acid groups, in their molecules. They have both electrostatic repulsion and steric limitation results, and their water-reducing residential or commercial properties are between those of naphthalene and polycarboxylic acid-based water reducers. This sort of water reducer dramatically promotes the very early stamina growth of concrete, however there may be a certain tendency to bleed. Melamine-based water reducers are recognized for their superb very early strength residential properties and are typically utilized in premade components and winter season building, however their relatively low water reduction rate and high cost limitation their extensive application.
Performance contrast between naphthalene-based water reducers and other water reducers
From the point of view of water decrease efficiency, the efficiency position of numerous water reducers is polycarboxylic acid-based > aminosulfonate-based > naphthalene-based > melamine-based. The ultra-high water reduction price of polycarboxylic acid-based water reducers gives them an irreplaceable advantage in the prep work of high-strength, high-fluidity concrete. In traditional strength-grade concrete, naphthalene-based water reducers can still offer a water decrease effect that satisfies the requirements and has obvious price advantages.
In terms of depression retention, polycarboxylic acid water reducers carry out best, with a 2-hour downturn loss of less than 10%, while naphthalene water reducers might lose 30%-40%. This distinction is especially considerable throughout long-distance transport or building and construction in high-temperature settings. In regards to toughness growth characteristics, naphthalene water reducers are better than polycarboxylic acid water reducers in advertising the early stamina (1d, 3d) of concrete, but the later stamina growth is comparable.
In terms of flexibility, naphthalene water reducers have a greater tolerance to changes in raw materials and much better compatibility with various kinds of concrete. Polycarboxylic acid water reducers may be much more conscious aspects such as aggregate mud web content and cement mineral structure and call for more stringent quality control. From an ecological viewpoint, the production procedure of polycarboxylic acid water reducers is cleaner and does not include harmful compounds such as formaldehyde, which is dramatically better than conventional naphthalene products.
(TRUNNANO Naphthalene-based water reducer)
Option considerations in design applications
In real engineering, the selection of water reducers need to consider design demands, ecological problems and financial advantages. For large-volume concrete or basic industrial and civil structures, naphthalene water reducers have noticeable cost-effectiveness advantages. In incredibly skyscrapers, long-span bridges and various other locations where concrete efficiency is very high, polycarboxylic acid water reducers are the only options.
Applications in special settings are additionally worth paying attention to. In low-temperature atmospheres, the combined use of naphthalene water reducers and early strength representatives has a good effect; in high-temperature settings, the outstanding collapse defense efficiency of polycarboxylic acid water reducers can better guarantee the building top quality. From the viewpoint of the life cycle price analysis, although the device price of polycarboxylic acid water reducers is relatively high, the convenience of building and improved structural durability brought by them may make the total price extra economical.
Naphthalene water reducers and various other kinds of water reducers each have their very own technological qualities and applicable areas, and there is no absolute difference between great and bad. Naphthalene water reducers still have irreplaceable worth in traditional engineering, while polycarboxylic acid water reducers represent the future advancement instructions. With technological development, the production process and environmental management performance of naphthalene water reducers are expected to be further boosted. In design method, the type of water reducer need to be scientifically selected according to certain needs, and a composite use technique can be adopted when essential to accomplish the most effective technical and financial results. Future research study must concentrate on the communication system in between water reducers and cementitious material systems, along with the growth and application of eco-friendly water reducers.
Cabr-Concrete is a supplier under TRUNNANO of Concrete Admixture with over 12 years of experience in nano-building energy conservation and nanotechnology development. It accepts 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 Concrete foaming agent, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com)
Tags: concrete superplasticizer,Naphthalene-based water reducer; Polycarboxylic acid-based water reducer
All articles and pictures are from the Internet. If there are any copyright issues, please contact us in time to delete.
Inquiry us
