硅烷改性偏高岭土基地质聚合物的基本性能和耐久性研究,Polymer Composites

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硅烷改性偏高岭土基地质聚合物的基本性能和耐久性研究
Polymer Composites ( IF 4.8 ) Pub Date : 2022-07-06 , DOI: 10.1002/pc.26858
Bowen Feng ₁ , Jiesheng Liu ₁ , Yaohua Chen ₁ , Man Zhang ₁ , Xiaoming Tan ₁

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耐久性是绿色建材可持续发展的重要属性。本文以偏高岭土基地质聚合物为对照组，通过添加不同剂量（1-4 wt%）的 APTES（3-氨基丙基三乙氧基硅烷）制备改性地质聚合物试样，研究硅烷对偏高岭土基基本性能和耐久性的影响。地质聚合物。同时，通过显微试验揭示了硅烷改性地质聚合物对耐久性能的影响机理。基本性能和耐久性实验包括流动性、稠度、机械强度、硫酸盐干湿循环和冻融循环。显微实验包括 SEM、XRD、N ₂用于表征的吸附-解吸。结果表明，1-2 wt% APTES 改性地质聚合物试样提高了流动性和稠度。然而，过量的剂量会抑制样品的流动性和一致性。另一方面，随着APTES含量的增加，第7天和第28天的机械强度呈现先升后降的趋势。第28天和第56天硫酸盐干湿循环实验表明，随着APTES用量的增加，改性地质聚合物的失重比对照组先减小后增加，而抗硫酸盐系数则呈现相反的趋势。25次和50次冻融循环实验与硫酸盐干湿循环结果的变化一致。

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Investigation on basic properties and durability of metakaolin based geopolymer modified with silane

Durability is of great importance property in the sustainable development of green building materials. In this paper, metakaolin based geopolymer was used as control group and modified geopolymer specimens were prepared by adding different dosages (1–4 wt%) of APTES (3-Aminopropyltriethoxysilane) to study the effect of silane on basic properties and durability of metakaolin based geopolymer. Meanwhile, microscopic tests were used to reveal the mechanism of geopolymer modified with silane on durability performance. Basic properties and durability experiments included fluidity, consistency, mechanical strength, sulfate wet-dry cycles, and freeze–thaw cycles. Microscopic experiments included SEM, XRD, N₂ adsorption–desorption for characterization. The results showed that 1–2 wt% APTES modified geopolymer specimens improved the fluidity and consistency. However, excessive dosages inhibited fluidity and consistency of specimens. On the other hand, with the increase of APTES contents, mechanical strength under 7th days and 28th days showed a trend of first rise and then fall. Sulfate dry-wet cycles experiments under 28th days and 56th days indicated that with the increase of APTES dosages, the weight loss of modified geopolymer decreased firstly and then increased compared to the control group, while coefficient of sulfate resistance showed the opposite trend. The 25 times and 50 times freeze–thaw cycles experiments were consistent with the changes of sulfate dry-wet cycles results. Microscopic experiments were used to characterize the control and modified groups and to reveal the mechanism on basic properties and durability of geopolymer modified with silane.

更新日期：2022-07-06

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