That variability is especially owed to the effects on air voids of aggregate, cement and supplementary cementitious materials; air-entraining agent dosage; batch contaminants; mixing dynamics; temperatures during batch-to-placing window; and, mix slump changes.
After the 2014 ConExpo-Con/Agg preview of a polymeric, microsphere-based agent manufactured at the batch plant and aimed at replacing air-entraining agents, BASF Construction Chemicals' Admixture Systems commenced market awareness and acceptance activities.
Moreover, according to the researchers (Kurdowski 2003), these bubbles are slightly bigger than those trapped under the influence of an air-entraining agent, but their stability is lower.
because of too low compacting, cause higher decrease of concrete strength than smaller air voids produced by an air-entraining agent.
One paper emphasizes the effects of void parameters on concrete FT resistance, and one paper introduces a new method for determining the air-entraining agent
demand of a concrete mixture.
The amount of the air-entraining agent admixture required to obtain the target air percentage in a concrete mix increases with the increase in the fly ash content in the mix, say Chaitanya Paleti, graduate student, and Jan Olek, professor, School of Civil Engineering, Purdue University, and Tommy E.
Two out of these four admixtures included different types of air-entraining agents, a vinsol resin-based air entraining agent, and synthetic-type air entraining agent.
UKPRwire, Wed Jun 29 2016] The report Concrete Admixtures Market by Type (Superplasticizers, Normal Plasticizers, Accelerating Agents, Air-Entraining Agents
, Retarding Agents, Waterproofing Agents, & Others), & by Application (Residential, Non-Residential, & Infrastructure) - Global Forecasts to 2020,analyzes the global concrete admixtures market with respect to market drivers, restraints, opportunities, and challenges in different regions.
and waterproofings admixtures are growing at higher rates
In recent years, synthetic air-entraining agents
have caused problems in a number of paving projects, including loss of strength.
ClickPress, Thu Oct 30 2014] Concrete Admixtures Market by Type (Super Plasticizers, Normal Plasticizers, Accelerating Agents, Retarding Agents, Air-Entraining Agents
, Waterproofing Admixtures, Others) - Global Trends & Forecast to 2019
Freezing of air-entrained cement-based materials and specific actions of air-entraining agents
, Cement and Concrete Composites 25(7): 759-765.