碱激发矿渣水泥基材料收缩性能研究

doi:10.11962/1006-4990.2019-0586

摘要/Abstract

摘要：

通过XRD、SEM、TGA等方法研究了膨胀剂掺量、碱当量、水玻璃模数对碱矿渣水泥砂浆干燥收缩、质量损失的影响。结果表明：氧化钙膨胀剂的加入会使矿渣产生膨胀现象,且随膨胀剂掺量（6%~10%）的增加,膨胀值增大;而氧化钙-硫铝酸钙复合膨胀剂的加入对矿渣的收缩无改善效果。XRD及SEM测试结果表明,氢氧化钙是氧化钙膨胀剂在矿渣中的主要膨胀源;掺加氧化钙-硫铝酸钙复合膨胀剂后未生成钙矾石相,是其未能改善矿渣收缩的主要原因。水玻璃模数及碱当量都会影响膨胀剂在矿渣中的作用效果。膨胀剂的加入会降低矿渣在干燥条件下的质量损失及体系游离水含量,其中氧化钙膨胀剂对两者的降低幅度更大。

关键词: 碱矿渣水泥, 钙系膨胀剂, 干燥收缩

Abstract:

The influence of expansive agents dasages,alkali concentration and modulus of sodium silicate on drying shrinkage and mass loss of alkali activated slag was investigated by XRD,SEM and TG.The results indicated that the addition of CaO expansive agent caused swelling phenomenon on alkali activated slag,and the expansion value increased with the dosage of CaO expansive agent（6%~10%）.While the addition of calcium oxide-calcium sulphoaluminate expansive agent didn′t improve the shrinkage of alkali activated slag.The results of XRD and SEM tests showed that Ca（OH）₂ was the main expansion component in CaO expansive agent.Besides,no AFt prepared after the addition of calcium oxide-calcium sulphoaluminate expansive agent was the main reason that CS could not improve the shrinkage of slag.The effect of expansive agent in activated slag was affected by calcium oxide-calcium sulphoaluminate and alkali concentration.Expansive agents could decrease the mass loss and free water content of SG and CaO expansive agent could significant reduce that.

Key words: alkali activated slag cement, calcium series expansive agent, drying shrinkage

中图分类号:

TQ172.12

麻鹏飞,李爽,程宝军,康升荣,张萍,高育欣. 碱激发矿渣水泥基材料收缩性能研究[J]. 无机盐工业, 2020, 52(10): 145-150.

Ma Pengfei,Li Shuang,Cheng Baojun,Kang Shengrong,Zhang Ping,Gao Yuxin. Research on contractility of alkali activated slag mortar[J]. Inorganic Chemicals Industry, 2020, 52(10): 145-150.

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参考文献 23

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材料	w（SiO₂）	w（Al₂O₃）	w（CaO）	w（MgO）	w（TiO₂）	w（Fe₂O₃）
SG	31.63	13.42	36.35	9.12	2.76	1.32
C	3.81	2.02	78.27	1.18	—	1.55
CS	4.97	1.29	50.07	2.05	—	1.15
材料	w（SO₃）	w（K₂O）	w（Na₂O）	烧失量	w（f-CaO）
SG	0.28	0.46	0.34	0.61	—
C	0.17	—	—	11.49	55.73
CS	20.65	—	—	18.84	—

样品编号	w（可蒸发水）	样品编号	w（可蒸发水）
SG	71.70	SG-CS-8%	69.23
SG-C-8%	62.86

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