Self-compensating geopolymer utilizing nano-clay and chopped basalt fibers
Self-compensating geopolymer utilizing nano-clay and chopped basalt fibers
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利用纳米粘土和短切玄武岩纤维的自补偿地质聚合物
DOI：
10.1016/j.conbuildmat.2022.129302
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发表时间：
2022
影响因子：
7.4
通讯作者：
Shiding Miao
中科院分区：
文献类型：
--
作者：
Jingyao Li;Jiwen Si;Feng Luo;Chuanxiao Zuo;Peiping Zhang;Yanbin Sun;Wenqing Li;Shiding Miao
•自补偿地聚合物是由拉脱土和玄武岩纤维制成的。•通过PVA润滑一步拉伸制备柔性玄武岩纤维。•粗糙度得到改善，耐碱性增强。•机理为在地聚合物中形成类似水滑石的物质。为了消除碱活化地聚合物的干燥收缩，提高其韧性，以纳米级拉脱土和玄武岩纤维为添加剂制备了自补偿增强地聚合物。在渣/粉煤灰基碱体系中，具有胶凝特性的镁硅酸钠土对地聚合有一定的影响。新形成的水化产物为类水滑石相（Ht）证实了这一点。在活化作用下，Mg +的释放促进了原物料（矿渣和粉煤灰）中Al的参与。在矿渣/粉煤灰基地质聚合物砂浆中，当掺量为4.0 ~ 5.0 wt%时，收缩率接近于零。复合砂浆具有优异的抗拉强度，可达5.7 MPa，单位面积孔隙数较其他文献少。将掺量为4.0%的聚乙烯醇改性柔性玄武岩纤维掺入地聚合物中，其抗弯强度提高51%。
• Self-compensating geopolymer was developed by using laponite and basalt fibers. • The flexible basalt fibers was prepared via one-step drawing with PVA lubircation. • The improved roughness and enhanced resistance to alkalis was obtained. • Mechanism was found as hydrotalcite-like species formed in the geopolymer. To eliminate the drying shrinkage as well as improve toughness of alkali activated geopolymer, the nano-sized laponite and chopped basalt fibers were utilized as additives to prepare self-compensating reinforced geopolymer. The magnesium-silicate laponite featured with gelable properties was found to influence geopolymerization in the slag/fly ash-based alkali system. This was validated by the new formation of hydration products as hydrotalcite-like phase (Ht). The release of Mg 2+ under activation promoted the participation of Al from the starting materials (slag and fly ash). Near-zero shrinkage was obtained at the dosage of laponite 4.0–5.0 wt% in the slag/fly ash-based geopolymetric mortars. The composite mortars exhibited excellent tensile-bond strength up to 5.7 MPa, and the low numbers pores of per unit area was achieved compared to other literatures. The flexural strength was improved by 51 % when the geopolymer was incorporated with flexible basalt fibers as modified with polyvinyl alcohol at dosage of 4.0 vol%.