Analysis of chemical admixtures combination on coating mortar using Simplex network method

Souza, Alessandra Tolentino; Carvalhais, Catharina de Almeida

doi:10.1016/j.conbuildmat.2019.117796

Cited by 8 publications

(7 citation statements)

References 16 publications

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“…Azevedo et al (2020) [ 12 ] obtained values ranging from 0.8 MPa to 1.1 MPa replacing natural sand with sand from waste paper; Marvila et al (2019) [ 3 ] obtained values from 1.0 MPa to 1.1 MPa with the same mortar composition. Similar results were obtained by Bonfim et al (2021) [ 37 ] and Souza et al (2020) [ 38 ]. Therefore, the flexural strength values are compatible.…”

Section: Resultssupporting

confidence: 90%

Recycled PET Sand for Cementitious Mortar

Campanhão¹,

Marvila

Azevedo³

et al. 2021

Materials

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Cementitious materials cause a great impact on the environment due to the calcination of clinker and the extraction of non-renewable mineral resources. In this work, the replacement of quartz sand from the river by PET sand was evaluated at levels of 10%, 20%, and 30%. Tests were performed in the fresh state through consistency, air retention, density, and incorporated air and in the hardened state for compressive strength, flexural strength, density, capillarity, and water absorption. The results show that PET sand is viable in contents of up to 10%, improving the mechanical properties of the mortar and without compromising its workability and incorporated air properties. Above that level, the loss of properties is very excessive, mainly of workability and incorporated air. The incorporated air of the 30% composition, for example, reaches 24%, an excessive value that impacts the properties of the hardened state, making it impossible to use the material at levels greater than 20%. It is concluded that the use of recycled PET sand is a possibility that contributes to sustainable development, as it reduces the extraction of quartz sand from the river, a non-renewable mineral resource.

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Section: Resultssupporting

confidence: 90%

Recycled PET Sand for Cementitious Mortar

Campanhão¹,

Marvila

Azevedo³

et al. 2021

Materials

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“…Pore radius size (A) Figure 4. Determination of consistency index Understanding the need for water to maintain workability is important, as it is known that excess water, although increasing the workability of Portland cement mortars, is deleterious, weakening the final mechanical strength of the hardened product (Souza, Carvalhais & Santos, 2020). Depending on the IOT addition content in mortar production, the spreading results indicate the use of chemical additives (possibly plasticizers), which could guarantee the ease of application, handling and good finishing of cementitious composites.…”

Section: Consistency-flow Tablementioning

confidence: 99%

Influence of Addition Contents of Iron Ore Tailings on Structural Mortar

Castro¹,

Almada²,

Fajardo³

et al. 2021

JMS

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This study discusses and analyzes an alternative of IOT reuse as addition in structural mortars, evaluating the influence of IOT addition contents. The material was physically and chemically characterized. Structural mortars were molded with 10%, 20%, 30% and 40% of addition of IOT in relation to cement mass. We investigate physical properties, mechanical indicators, durability indicators and microstructure. The tailings are composed of predominantly quartz, hematite and goethite, and no components were found that could compromise the cementitious composites. The addition of IOT provided a tendency to reduce open porosity. The addition of 30% IOT was the most efficient in closing pores. All addition contents led to the maintenance or gains in mechanical properties, and a 10% gain in flexural tensile strength was observed for the addition of 10% IOT. The addition of 40% IOT promoted a 14% gain in compressive strength and maintenance of flexural tensile strength. This addition content evidences that the carbonation depth was not significantly affected. Based on the results, the addition percentages of 30-40% are interesting as to the analyzed properties.

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“…Current research indicates that depending on the type of admixture used, there may be great variability in their properties' results [9], [10], even with compounds with the same chemical name [11]. Viscosity, molar mass and/or nature and quantity of chemical substitution groups can be responsible for these variations [12].…”

Section: Introductionmentioning

confidence: 99%

“…Due to the exposed facts, it is important to know the chemical additive which will be added to the mortar, or even carry out a previous analysis of the influence of it on mortar's properties to achieve the desired results of designed properties [9]. This study intended to research the properties of three different types of admixtures with potential to act as a water retainer: hydroxyethyl methyl cellulose (HEMC), vinyl acetate and ethylene polymer (pAVE) and acrylic polymer (pA), varying their content (including over dosage).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of mortar coating with different types and proportions of chemical admixtures that have water retentivity properties

Souza

Carvalhais

Santos

2021

Rev. IBRACON Estrut. Mater.

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Water retaining agents are the main admixtures used to retain water against evaporation and substrate suction, and there are several chemical compounds for this purpose. To deepen the knowledge of mortar admixtures, several concentrations (0%, 1.5%, 5%, 10% and 15%) of three different types of admixtures were studied: an acrylic polymer, a cellulosic and ethylene vinyl acetate. Fresh properties (consistency, water retention, density and incorporated air), physical indexes (density and porosity) and compressive strength at 28 days were analyzed. It has been found that admixtures can act in different ways on mortars depending on the type of chemical agent used and can significantly affect the mechanical and durability characteristics in the fresh and hardened state. With this work it was verified the importance of searching references about the influence of chemical compounds before using it.

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Analysis of chemical admixtures combination on coating mortar using Simplex network method

Cited by 8 publications

References 16 publications

Recycled PET Sand for Cementitious Mortar

Recycled PET Sand for Cementitious Mortar

Influence of Addition Contents of Iron Ore Tailings on Structural Mortar

Analysis of mortar coating with different types and proportions of chemical admixtures that have water retentivity properties

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