不同类型硅酸盐水泥生产的高性能膏体中减水剂的和易性维持

IF 0.5 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
P. D. Matos, R. Sakata, Maiara Foiato, W. L. Repette, P. Gleize
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引用次数: 2

摘要

本研究评估了用两种硅酸盐水泥(一种是火山灰水泥,另一种是高早强水泥)生产的高性能膏体(水灰比分别为0.30、0.33和0.36)中多功能(木质素磺酸盐为基础)和高效减水剂(聚羧酸盐为基础)的效率和和易性维持。通过拌合后立即、拌合后20分钟和40分钟的微坍落度试验来评价膏体的和易性。此外,还对水泥和外加剂不同配比下的固定w/c比(0.36)和小坍落度(130 mm)膏体的机械强度进行了评价。结果表明,CP IV+木质素磺酸盐和CP V-ARI+聚羧酸盐的可加工性随时间的推移保持最好。两种外加剂的28天强度均比CP IV高22%。结果表明,含木质素磺酸盐的浆料强度比含聚羧酸盐的浆料强度高10%左右。总的来说,用外加剂和水泥生产的高性能硅酸盐水泥膏体可以获得相同的和易性;然而,其和易性和机械强度在很大程度上取决于水泥和外加剂的组合。关键词:水泥浆体;和易性维护;多重的;强塑剂;迷你衰退。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Workability maintenance of water-reducing admixtures in high-performance pastes produced with different types of Portland cement
This work evaluated the efficiency and workability manteinance of a polyfunctional (lignosulfonate-based) and a superplasticizer (polycarboxylate-based) admixture in high-performance pastes (water/cement ratios of 0.30, 0.33 and 0.36) produced with two types of Portland cement (one pozzolanic and one high early strength). The workability of the pastes was evaluated by the mini slump test immediately after mixing, and after 20 and 40 minutes. Furthermore, the mechanical strength of pastes with fixed w/c ratio (0.36) and mini slump (130 mm), produced with the different combinations of cements and admixtures, was evaluated. The results showed that the CP IV+lignosulfonate and CP V-ARI+polycarboxylate mixes presented the best workability maintenance over time. The pastes produced with CP V-ARI presented 28-day strengths about 22% higher than those produced with CP IV, for both admixtures. In turn, the lignosulfonate-containing pastes showed strengths about 10% higher than those produced with the polycarboxylate-based admixture. Overall, it was possible to obtain the same workability for high-performance Portland cement pastes produced with both admixtures and cements; however, the workability mantainance and mechanical strength highly depends on the combination of cement and admixture used.  Keywords: Cement paste; Workability maintenance; Polyfunctional; Superplasticizers; Mini slump.
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来源期刊
Materia-rio De Janeiro
Materia-rio De Janeiro MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
1.00
自引率
25.00%
发文量
51
审稿时长
6 weeks
期刊介绍: All the articles are submitted to a careful peer-reviewing evaluation process by the journal''s Editorial Board. The Editorial Board, reviewers and authors make use of a web based proprietary automated tool to deal with the reviewing procedures.the Revista Matéria''s article reviewing restricted access system - SEER. Authors are not informed about the identity of the reviewers.
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