PAPER OPEN ACCESS Related content Plasticizer and
higher resistance, there are problems with frost resistance of non-air-entrained concretes, even under conditions of moderate frost effect. One solution to the problem is the creation of possibilities of the use of cement with mineral additives containing in the composition of which air-entraining admixture (AEA): air-entraining multicomponent
Plasticizer and Superplasticizer Compatibility with
When analyzing the admixtures individually, it is possible to see that the plasticizer side effect of incorporating air is the smallest of the three admixtures. Studies have shown that the...
Period #10 Notes: ADMIXTURES & CEMENT REPLACEMENT MATERIALS A
benefits of air-entrainment (see below). 2. Super plasticizers: These admixtures are sometimes called high-range water reducers and are similar to plasticizers except that they greatly reduce the amount of water needed in a mix. High range water reducers are admixtures that allow 12-30% water reduction or greater
SUPERPLASTICIZER COMPATIBILITY PROBLEM WITH INNOVATIVE AIR
Most of the available superplasticizers cause a significant increase of the air content of concrete mixtures. The problem of compatibility of superplasticizer and air-entraining admixture...
Superplasticizer
Superplasticizers ( SPs ), also known as high range water reducers, are additives used in making high strength concrete. Plasticizers are chemical compounds that enable the production of concrete with approximately 15% less water content. Superplasticizers allow reduction in water content by 30% or more.
- What are air entraining agents?
- Air – entraining agents are chemical admixtures that release the smallest air bubbles into the concrete mixture. These tiny bubbles form minute voids in the hardened concrete, resulting in boosting concrete’s durability and resilience against freeze-thaw cycles.
- What are air entraining additives?
- Air-entraining additives contain surface-active molecules, which have a hydrophilic (water-attracting) end and a hydrophobic (water-repelling) end. These additives reduce the surface tension of the water in the mix, leading to the formation of small, stable air bubbles.
- What are air entraining agents & corrosion inhibitors?
- Air Entraining Agents: Introduce air bubbles into the concrete, enhancing freeze-thaw resistance and reducing the risk of scaling and cracking. Corrosion Inhibitors: Protect steel reinforcement from corrosion, essential in structures exposed to chlorides or other aggressive environments.
- Do concrete mixes with air-entraining agents and plasticising admixtures entrain air?
- In the case of concrete mixes with air-entraining agents and plasticising admixtures, it has been observed that mixes contain differing amounts of admixtures in order to maintain similar slump and air content. Admixtures, especially superplasticisers based on PCE, are known to entrain air [11, 12].
- What is the compatibility of superplasticizer and air-entraining admixture in Portland cement?
- The problem of compatibility of superplasticizer and air-entraining admixture increases in case of multicomponent Portland cement, due to different effects of these additives. It comes down to achieving a compatibility of the three variables mentioned in the title of the paper, due to the required air entrainment and consistency of mixture.
- What are air entraining admixtures?
- Air-entraining admixtures are surfactants that change the surface tension of the water. Traditionally, they were based on fatty acid salts or vinsol resin but these have largely been replaced by synthetic surfactants or blends of surfactants to give improved stability and void characteristics to the entrained air.
