Development of polymer films by the coalescence of polymer particles in powdered and aqueous polymer-modified mortars

Afridi, Musarrat Ullah Khan; Ohama, Yoshihiko; Demura, Katsunori; Iqbal, Muhammad Aamir

doi:10.1016/s0008-8846(02)01094-3

Cited by 113 publications

(39 citation statements)

References 2 publications

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“…Beeldens et al (2001) utilizaram essa técnica a fim de investigar o comportamento do polímero no CP, atacado por ácido sulfúrico [10]. Afridi et al (2003) também utilizaram a MEV para o desenvolvimento de filmes poliméricos, aplicáveis ao CP [11].…”

Section: Resultados E Discussõesunclassified

Concreto impregnado com polímero (CIP): uso e aplicação do EPS reciclado para redução da permeabilidade de superfícies de concreto

Amianti

Botaro

2008

Matéria (Rio J.)

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A redução da porosidade, e conseqüente redução da permeabilidade, pode ser uma solução para aumentar a durabilidade do concreto e preservar suas características superficiais. Dentro desse contexto, esta pesquisa foi desenvolvida com o objetivo de identificar um novo material a ser aplicado no sistema CIP (Concreto Impregnado com Polímero) de forma econômica, eficiente e com simplicidade, a fim de reduzir a permeabilidade das superfícies de concreto pré-fabricado. Adicionalmente: a) empregar um tratamento que não modifique o aspecto visual do concreto, abrindo perspectivas para o emprego em monumentos e obras expostas à ação das intempéries; b) desenvolver uma nova tecnologia utilizando polímeros reciclados, a fim de contribuir com a sociedade e a natureza de uma forma geral. O poliestireno (PS) reciclado a partir do EPS (poliestireno expandido) foi escolhido por apresentar características importantes como baixas absorções de água, resistência ao envelhecimento e por ser inócuo, ou seja, não constitui substrato para a proliferação de microorganismos. Foram realizados ensaios de absorção de água, verificação de profundidade de tratamento pela análise de ultravioleta e microscopia eletrônica de varredura. O presente trabalho mostra a oportunidade e a importância da modificação superficial de concretos com materiais recicláveis e que, normalmente, são descartados no meio ambiente. O concreto impregnado com EPS reciclado, a partir de agora denominado CIP-EPS-r, apresentou resultados promissores mostrando uma redução significativa da permeabilidade à água, redução da porosidade e pode acarretar uma diminuição da proliferação de fungos na superfície do concreto tratado.Palavras-chaves: concreto modificado, EPS, tratamento superficial. Polymer impregnated concrete (PIC): use and application of the recycled EPS for waterproofing of concret surfaces ABSTRACTA reduction in porosity, with a consequent reduction in permeability, could be an option for increasing the durability of the concrete and preserving its surface characteristics. This research was developed in order to identify a new material to be economically, efficiently and easily applied, as part of the PIC (Polymer Impregnated Concrete) system, so as to reduce the permeability of pre-cast concrete surfaces, thereby, reducing the rate of degradation and increasing overall durability. Addition aims are: a) using materials which do not affect the visual aspect of the concrete, so that the system can be used on monuments and other elements that are exposed to inclement weather; b) developing a new technology that makes use of recycled polymers, thereby contributing both socially and environmentally. Polystyrene is widely used in industry, principally in the packaging sector. This material presents a number of significant features, including: a low water absorption coefficient; a slow aging process; pathogenic innocuousness (i.e. it does not possess substrata for the proliferation of animals and/or microorganisms; among others. On the other hand, in most cases, final ...

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Section: Resultados E Discussõesunclassified

Concreto impregnado com polímero (CIP): uso e aplicação do EPS reciclado para redução da permeabilidade de superfícies de concreto

Amianti

Botaro

2008

Matéria (Rio J.)

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“…The model is to some extent similar to that established for the pre-mix modifiers, however, some significant peculiarities need to be taken into account. In the case of PCC with thermoplastic polymers, the main processes involved are the cement hydration and the polymer film formation on the way of coalescence of dispersed polymer particles [26]. When the epoxy resin is used as a modifier, the additional process takes places, namely the chemical reaction of the resin with the hardener, leading to cross-linking of the resin.…”

Section: Model Of Microstructure Formationmentioning

confidence: 99%

Studies on the Microstructure of Epoxy-Cement Composites

Łukowski

2016

Archives of Civil Engineering

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Tntroduction ofpolymers into the cement composites improves same of the properties of concretes and mortars.Therefore, the polymer-cement composites are successfully used in construction. The model of microstructure formation in cement composites modified with thermoplastic polymer (pre-mix modifiers) has already been developed and successfully implemented. However, the formation ofmicrostructure in the case of epoxy-cement composites ( containing post-mix modifier) demonstrates same peculiarities wbich shou]d be taken into account when modelling the process. The microstructure of epoxy-cement composites and its formation is discussed in the paper. The model is offered, formulated on the basis of the microscopic observations and results oftesting.

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“…The modification with redispersible polymer powders is similar to that of latex formation except that it also involves the redispersion of the polymer powders [8][9][10][11][12][13][14][15] . In these cases, the modification is governed by both Portland cement hydration and polymer film formation processes in their binder phase [16][17][18][19][20][21][22] . The cement hydration process generally precedes the polymer film formation by coalescence of polymer particle.…”

Section: Polymer Additionmentioning

confidence: 99%

Study of hygral behavior of non-asbestos fiber cement made by similar hatschek process

Gomes

Savastano

2013

Mat. Res.

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Fiber cement, similarly to all cementitious materials, undergoes dimensional and volumetric changes when it is exposed to dry and wet environments. When exposed to natural weathering, cement-based materials absorbs and may also release water to their surroundings via a very complex inherent pore structure. In this work initialized a few years ago, some properties of asbestos-free fiber cement composites were studied, such as density, porosity and loss or absorption of water. For the understanding of the behavior of this material, modifiers were employed in the cement matrix such as styrene-acrylic, styrene-butadiene and vinyl acetate-versatic vinylester copolymers to verify their influence on the variables described above. All composites were analyzed by mercury intrusion porosimetry (MIP). For monitoring the expansion/shrinkage movements, the specimens were exposed inside a controlled environmental chamber with constant temperature and relative humidity (RH) during the test time. The results showed no interference on hygral behavior because particular casting process of these composites but, as showed by literature, increase of toughness. Also, it was possible to verify that moisture movement within the asbestos-free fiber cement can be very complex and the variables density and porosity (pore structure) play a very important role in the expansion/shrinkage properties of these composites.

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Development of polymer films by the coalescence of polymer particles in powdered and aqueous polymer-modified mortars

Cited by 113 publications

References 2 publications

Concreto impregnado com polímero (CIP): uso e aplicação do EPS reciclado para redução da permeabilidade de superfícies de concreto

Concreto impregnado com polímero (CIP): uso e aplicação do EPS reciclado para redução da permeabilidade de superfícies de concreto

Studies on the Microstructure of Epoxy-Cement Composites

Study of hygral behavior of non-asbestos fiber cement made by similar hatschek process

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