不同钙源对地聚合物反应机制的影响研究*

doi:10.11901/1005.3093.2015.558

材料研究学报

2016, Vol. 30

Issue (5): 348-354 DOI: 10.11901/1005.3093.2015.558

本期目录 | 过刊浏览

不同钙源对地聚合物反应机制的影响研究*

郭晓潞^1,²(

), 施惠生^1,², 夏明²

1. 同济大学先进土木工程材料教育部重点实验室上海 201804
2. 同济大学材料科学与工程学院上海 201804

Effect of Different Calcium Resouces on Reaction Mechanism of Geopolymer

GUO Xiaolu^1,^2,^**(

), SHI Huisheng^1,², XIA Ming²

1. Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, Tongji University, Shanghai 201804, China
2. School of Materials Science and Engineering, Tongji University, Shanghai 201804, China

引用本文:

郭晓潞, 施惠生, 夏明. 不同钙源对地聚合物反应机制的影响研究*[J]. 材料研究学报, 2016, 30(5): 348-354.
Xiaolu GUO, Huisheng SHI, Ming XIA. Effect of Different Calcium Resouces on Reaction Mechanism of Geopolymer[J]. Chinese Journal of Materials Research, 2016, 30(5): 348-354.

全文: PDF(3072 KB) HTML

摘要:

在地聚合物体系中, 反应产物会随原材料化学组成与激发条件的不同产生巨大差异, 钙掺杂地聚合物的反应机理、产物组成与结构更为复杂。试验采用5种外加晶体钙源和2种非晶体外加钙源以不同比例与偏高岭土复掺制备地聚合物, 研究了外加钙源对地聚合物性能和反应机制的影响。研究表明: 外加钙源中Si、Al的溶出量与钙源的结构有关, Si和Al的溶出量之间存在很强的正相关性, 而Ca与Si、Al的溶出量之间不存在相关性。外加钙源会降低偏高龄土基地聚合物体系的抗压强度, 掺杂非晶体钙源地聚合物的抗压强度均大于掺杂晶体钙源的。外加钙源中Ca的溶出量与抗压强度之间存在负相关性。本研究为拓宽地聚合物原材料的来源和资源化利用含钙工业固体废弃物研制复合地聚合物提供了理论和试验依据。

关键词 ：无机非金属材料, 地聚合物, 钙, 偏高岭土, 粉煤灰, 矿渣

Abstract：

The reaction products of a system of geopolymer could be great different due to the variation of the chemical composition of raw materials and the activated conditions. In the system of geopolymer containing calcium, the reaction mechanism, composition of products, and their structures could be more complex. Metakaolin (MK)-based geopolymer was prepared from metakaolin with different amount of five kinds of crystal calcium resources and two kinds of non-crystal calcium sources. The effect of calcium resource on the performance and reaction mechanism of the geopolymer was then systematically studied. The result showed that the dissolution of Si and Al related to the structure of the calcium resources and had a strong positive correlation, but no clear relationship with Ca. The compressive strength of MK-based geopolymer could decrease by addition of calcium resources. The compressive strength of geopolymer with non-crystal calcium resource was higher than that with crystal one. The dessolved amount of calcium from the calcium resource had a negative connection with the compressive strength. It provided the theoretical and experimental base for broadening the raw material resources of geopolymer system, and for utilization of industrial solid wastes containing calcium.

Key words： Inorganic non-metallic materials geopolymer calcium metakaolin fly ash slag

收稿日期: 2015-09-30

ZTFLH:

TQ172

基金资助:* 国家自然科学基金51478328资助

作者简介: 本文联系人: 郭晓潞

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表1 偏高岭土、粉煤灰、矿渣粉的化学组成

表2 含钙硅酸盐矿物的基本性质

表3 含钙硅酸盐矿物的化学组成

表4 钙源在NaOH溶液中溶解24 h后的Ca、Si、Al溶出浓度

表5 三种具有框架结构的硅酸盐钙源的Si、Al溶出量的相关性分析

表6 外加钙源中Ca、Si、Al的溶出量的相关性分析

图1 外加钙源对MK基地聚合物抗压强度的影响

表7 外加钙源Ca的24 h溶出量与抗压强度的相关性分析

图2 含钙地聚合物的XRD图谱

图3 Ca对地聚合反应的影响机制

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