混杂纤维对脱硫石膏基复合胶凝材料性能影响

doi:10.19964/j.issn.1006-4990.2022-0017

摘要/Abstract

摘要：

掺加聚乙烯醇（PVA）纤维、玄武岩纤维（BF）及混杂纤维（PVA纤维与BF）对脱硫石膏基复合胶凝材料性能进行改性,研究纤维复合材料的力学性能、耐水性能及耐干湿性能；应用电镜扫描技术对复合材料的微观形貌进行观察,探讨纤维对脱硫石膏基复合胶凝材料的影响机制。结果表明:PVA纤维掺量为1.5%时复合材料力学性能较好,试样的绝干抗折强度和绝干抗压强度较空白组分别提升了92.55%和32.62%；混杂纤维掺量为0.9%时耐水性能较好,试样的抗折软化系数较空白组提升了46.60%、吸水率低至13.87%；混杂纤维掺量为0.6%时耐干湿性能较优,干湿强度系数较空白组提升了50.74%。

关键词: 聚乙烯醇（PVA）纤维, 玄武岩纤维（BF）, 混杂纤维复合材料, 脱硫石膏, 力学性能

Abstract:

Polyvinyl alcohol（PVA） fiber,basalt fiber（BF） and hybrid fiber（PVA fiber and BF） were added to modify the properties of desulfurized gypsum base composite cementing materials,and the mechanical properties,water resistance and dry-wet resistance of fiber composites were studied.Scanning electron microscopy（SEM） was used to observe the microstructure of the composite materials,and the influence mechanism of fiber on the desulfurized gypsum base composite cementified materials was discussed.The results showed that the mechanical properties of the composites were better when the content of PVA fiber was 1.5%,and the absolute dry flexural strength and absolute dry compressive strength of the sample were increased by 92.55% and 32.62% compared with that of the blank group,respectively.When the mixed fiber content was 0.9%,the water resistance of the sample was better.Compared with the blank group,the bending and softening coefficient of the sample increased by 46.60%,and the water absorption rate was lower than 13.87%.When the mixed fiber content was 0.6%,the dry-wet resistance was better,and the dry-wet strength coefficient increased by 50.74% compared with the blank group.

Key words: polyvinyl alcohol（PVA） fiber, basalt fiber（BF）, hybrid fiber composites, desulfurized gypsum, mechanical properties

中图分类号:

TB33

吕方涛,周银笙,孔德文,陈思翰,安红芳,王玲玲. 混杂纤维对脱硫石膏基复合胶凝材料性能影响[J]. 无机盐工业, 2022, 54(10): 127-132.

LÜ Fangtao,ZHOU Yinsheng,KONG Dewen,CHEN Sihan,AN Hongfang,WANG Lingling. Effect of hybrid fiber on properties of desulfurized gypsum based composite cementitious material[J]. Inorganic Chemicals Industry, 2022, 54(10): 127-132.

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材料类型	w（SiO₂）	w（Al₂O₃）	w（Fe₂O₃）	w（CaO）	w（SO₃）	w（P₂O₅）	w（K₂O）	w（SrO）	w（F）	w（Cl）
原状脱硫石膏	3.310	1.324	0.538	40.21	53.416	0.030	0.241	0.069	0.862	—
脱硫建筑石膏	2.859	1.108	0.470	38.506	54.851	0.027	0.232	0.088	0.744	—
生石灰	0.599	0.140	0.111	98.292	0.238	0.008	0.581	0.014	—	0.014
矿粉	34.985	15.703	0.842	35.179	2.609	0.025	7.582	0.042	—	0.047
硫铝酸盐水泥	6.472	14.924	1.804	57.096	18.385	0.046	1.001	0.036	—	0.236

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