Synergism effects of coconut diethanol amide and anionic surfactants for entraining stable air bubbles into concrete

Shan, Guangcheng; Zhao, Shuang; Qiao, Min; Gao, Nanxiao; Chen, Jian; Ran, Qianping

doi:10.1016/j.conbuildmat.2019.117625

Cited by 26 publications

(9 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ere are quite a few influential factors impacting air entrainment, in which bubble size and bubble distribution are decisive factors [28][29][30]. However, it is extremely difficult to obtain the bubble size and distribution in fresh concrete for engineering builders.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Durability Behaviour and Optimization of Concrete with Triple‐Admixtures Subjected to Freeze‐Thaw Cycles in Salt Solution

Wang

Zhu

et al. 2021

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

In the seasonal frozen area of northeast China, cement concrete is usually in a working environment of cold climate and chlorine erosion coupling effect. In general, with a reasonable addition of air entraining agent (AEA) and multimineral admixtures such as fly ash, blast furnace slag, and silica fume, the durability of cement concrete under the effects of freeze-thaw and salt solution can be significantly improved in cold regions. However, due to several more compositions of cement concrete with multiple mineral admixtures, it would take excessive trial mixtures to select the desired mixture proportion based on the conventional method. This means a great deal of costs of raw materials and laboratory experimental time. In this paper, the experimental scheme of mixture proportion for air-entrained concrete with multimineral admixtures was designed based on the orthogonal experiment design method. Based on the compressive strength, rapid chloride permeability, and weight loss and relative dynamic elastic modulus after salt freeze-thaw cycles, the influence of different mineral admixtures and their dosages on the durability of concrete subjected to freeze-thaw in salt solution was analyzed. After that, based on genetic algorithm, an optimization of mixture proportion was proposed, which only requires less trial mixes and accessible optimization process. The test results indicated the superiority of air-entrained concrete with multimineral admixtures when serving in salt freeze-thaw environment. Eventually, it was also verified that the optimized concrete in this paper could achieve pleasurable durability performances under salt freeze-thaw cycles.

show abstract

Section: Introductionmentioning

confidence: 99%

Investigation on Durability Behaviour and Optimization of Concrete with Triple‐Admixtures Subjected to Freeze‐Thaw Cycles in Salt Solution

Wang

Zhu

et al. 2021

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

“…The results indicate that, compared with traditional single-chained surfactants, the gemini and oligomeric surfactants have a higher foaming ability, foam stability, and air-entraining performance. Shan et al [ 60 ] reported the synergism effects of nonionic and anionic surfactants for entraining stable air bubbles into fresh concretes. Qiao et al [ 61 ] reported the effects of salts and adsorption on the performance of the air-entraining agents with different charge types in both solutions and cement mortars.…”

Section: Factors Influencing Bubble Generation and Developmentmentioning

confidence: 99%

Bubble Evolution under the Action of Polycarboxylate and Air-Entraining Agent and Its Effects on Concrete Properties—A Review

et al. 2022

View full text Add to dashboard Cite

In order to improve the performance of concrete, it is of great significance to have a better understanding the mechanism and main influencing factors of concrete bubble evolution under the action of polycarboxylate and air-entraining agents. In the present review, with respect to the generation, growth, stability, and rupture of concrete bubbles under the action of polycarboxylate and air-entraining agents, this paper discusses the influence of bubble characteristics on concrete performance and studies bubble regulation by air-entraining agents and polycarboxylate (PCE) superplasticizer. The results show that the acid-to-ether ratio, sulfonic acid group, ester group, and the type of air entraining agent of the polycarboxylate acid structure have a significant impact on the bubbles. The bubble size, specific area, spacing factor, and bubble content have a significant impact on the rheological properties and related mechanical properties of fresh concrete and also affect the appearance quality of concrete. The problems with the experimental methods and theoretical models of concrete bubble research were analyzed, and future research ideas were put forward.

show abstract

“…On the other hand, Huang et al proved that surface tension is not the decisive factor affecting foamability [ 30 ]. Shan et al proposed a coworking model between the anionic and nonionic surfactants, positively affecting the air–water interface [ 31 ]. …”

Section: Introductionmentioning

confidence: 99%

“…Shan et al proposed a coworking model between the anionic and nonionic surfactants, positively affecting the air–water interface [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Impact of Surfactant and Calcium Sulfate Type on Air-Entraining Effectiveness in Concrete

Sypek¹,

Latawiec²,

Łaźniewska-Piekarczyk

et al. 2022

Materials

View full text Add to dashboard Cite

The paper presents the evaluation of the influence of calcium sulfate on the air void microstructure in concrete and its action mechanism depending on the character of the air-entraining agent. Gypsum dehydration has been previously proven to negatively influence the air void structure of air-entrained concrete. Ettringite, nucleating from tricalcium aluminate and calcium sulfate, influences the adsorption and mode of action of anionic-based polycarboxylate ether admixtures. The authors suspected the admixture’s air-entraining mechanism was also affected by these characteristics. Gypsum dehydration was confirmed to influence the air void structure. In the case of the anionic surfactant, the content of air bubbles smaller than 300 µm was lower compared to cement with gypsum and hemihydrate. On the other hand, the content of air voids with a diameter up to 60 µm, which are the most favorable, was higher. The results obtained led to the conclusion that the mechanism of air entrainment was twofold, and in most cases occurred through the lowering of surface tension and/or through the adsorption of surfactant on cement grains. The adsorptive mechanism was proved to be more effective in terms of the total air content and the structure of the air void system. The results and conclusions of the study provide guidelines to determine the proper surfactant type to reduce the risk of improper air entrainment of concrete, and emphasize the importance of gypsum dehydration of cement in the process of air entrainment.

show abstract

Synergism effects of coconut diethanol amide and anionic surfactants for entraining stable air bubbles into concrete

Cited by 26 publications

References 30 publications

Investigation on Durability Behaviour and Optimization of Concrete with Triple‐Admixtures Subjected to Freeze‐Thaw Cycles in Salt Solution

Investigation on Durability Behaviour and Optimization of Concrete with Triple‐Admixtures Subjected to Freeze‐Thaw Cycles in Salt Solution

Bubble Evolution under the Action of Polycarboxylate and Air-Entraining Agent and Its Effects on Concrete Properties—A Review

Impact of Surfactant and Calcium Sulfate Type on Air-Entraining Effectiveness in Concrete

Contact Info

Product

Resources

About