拒水剂对石膏自然老化性能的影响

Q3 Materials Science

Cerâmica Pub Date : 2022-09-01 DOI:10.1590/0366-69132022683873270

S. D. S. Rodrigues, M. A. Silva, J. G. Soúsa, N. C. Olivier

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引用次数: 0

摘要

本研究评估了石膏与防水添加剂的行为，当提交到一个自然老化过程。采用铸造石膏和硅烷/硅氧烷基拒水剂作为材料。水灰比设为0.7，相对于石膏质量使用0.2%和0.4%的拒水剂含量。不含防水剂(参考)和含有大量防水剂的石膏膏在“零”龄期和30、60、90、120和150天自然老化后进行评估。经过150天的自然老化，观察到材料的机械性能(抗压强度和硬度)没有发生显著变化，保持在标准要求的最低水平以上。与参考样品相比，添加防水剂导致吸水率显著降低，证明了材料的防水能力。

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Behavior of plaster with water-repellent additive under natural aging

This research evaluates the behavior of plaster with a water-repellent additive when submitted to a natural aging process. Casting plaster and silane/siloxane-based water-repellent were used as materials. The water/plaster ratio was set at 0.7 and the contents of 0.2% and 0.4% of water-repellent were used, in relation to the plaster mass. Plaster pastes without water-repellent (reference) and containing mass water-repellent were evaluated at ‘zero’ age and after 30, 60, 90, 120, and 150 days of natural aging. After 150 days of natural aging, it was observed that the mechanical properties of the material (compressive strength and hardness) did not undergo significant variations and remained above the minimum required by a standard. The addition of water-repellent resulted in a considerable reduction in water absorption, demonstrating the water repellency capacity of the material, compared to the reference specimen.

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来源期刊

Cerâmica Materials Science-Ceramics and Composites

CiteScore

1.90

自引率

0.00%

发文量

审稿时长

10 weeks

期刊介绍： A Revista Cerâmica, órgão oficial da Associação Brasileira de Cerâmica (ABCERAM) publica contribuições originais de interesse na área de cerâmica, compreendendo arte cerâmica, abrasivos, biocerâmicas, cerâmicas avançadas, cerâmica branca, cerâmica de mesa, cerâmica eletroeletrônica, cerâmica estrutural, cerâmica magnética, cerâmica nuclear, cerâmica óptica, cerâmica química, cerâmica termomecânica, cerâmica vermelha, cimento, compósitos de matriz cerâmica, materiais refratários, materiais de revestimento, matérias-primas, vidrados, vidros e vitrocerâmicas, análise microestrutural, ciência básica, instrumentação, processos de fabricação, síntese de pós, técnicas de caracterização etc.