<strong>CaO</strong>增强复合胶凝材料的性能

doi:10.11901/1005.3093.2021.141

材料研究学报

2022, Vol. 36

Issue (4): 278-286 DOI: 10.11901/1005.3093.2021.141

研究论文

本期目录 | 过刊浏览

CaO增强复合胶凝材料的性能

郭磊¹^,²^,³^,⁴, 王泽坤¹, 郭利霞¹^,²^,³(

), 陈平平¹, 汪伦焰¹^,²^,³, 李明儒¹, 王卫凯¹

^1.华北水利水电大学郑州 450046
^2.河南水谷研究院郑州 450046
^3.河南省水环境模拟与治理重点实验室郑州 450002
^4.河南水投舆源水生态有限公司平舆 463400

Performance of CaO Reinforced Composite Cementitious Materials

GUO Lei¹^,²^,³^,⁴, WANG Zekun¹, GUO Lixia¹^,²^,³(

), CHEN Pingping¹, WANG Lunyan¹^,²^,³, LI Mingru¹, WANG Weikai¹

^1.School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China
^2.Henan Water Valley Research Institute, Zhengzhou 450046, China
^3.Henan Key Laboratory of Water Environment Simulation and Treatment, Zhengzhou 450002, China
^4.Henan Water Conservancy Investment YuYuan Water Ecology Co. Ltd., Pingyu 463400, China

引用本文:

郭磊, 王泽坤, 郭利霞, 陈平平, 汪伦焰, 李明儒, 王卫凯. CaO增强复合胶凝材料的性能[J]. 材料研究学报, 2022, 36(4): 278-286.
Lei GUO, Zekun WANG, Lixia GUO, Pingping CHEN, Lunyan WANG, Mingru LI, Weikai WANG. Performance of CaO Reinforced Composite Cementitious Materials[J]. Chinese Journal of Materials Research, 2022, 36(4): 278-286.

全文: PDF(5918 KB) HTML

摘要:

使用重金属污泥制备免烧砖。使用CaO钙源优化配置复合胶凝材料的组分,并调控胶凝浆体中的水化产物和未水化相。先基于免烧砖原料的配合比计算复合胶凝体系的钙硅比(Ca/Si)并控制其值为0.8~1.2,设计添加CaO的免烧砖实验方案。使用核磁共振(NMR)、透射电镜-能谱等手段和PCAS分析软件,研究了CaO使高硅复合胶凝材料性能提高的机理。结果表明：随着高硅胶凝体系Ca/Si比在0.8~1.2范围内的提高,免烧砖的力学性能先提高后降低,Ca/Si比的最佳值为1.0,CaO也有一个最佳调控值。随着Ca/Si比的提高7 d试样的吸水率先降低后提高,28 d试样的吸水率线性降低。随着Ca/Si比的提高,试样中平面孔径大于200 μm的孔隙率递减,分形维数先减小后增大；对于孔径小于200 μm的孔结构,随着Ca/Si比的提高孔径为200~200 μm的孔减少,孔径小于200 nm的孔增多,孔的体积呈减小的趋势。复合胶凝体系能抑制污泥免烧砖70%以上的重金属浸出量。

关键词 ：复合材料, 免烧砖, 钙硅比, 污泥, 力学性能

Abstract：

Unburned brick was prepared with sludge containing heavy metals as raw material, and CaO as calcium source to optimize the composition of the composite cementitious material and to regulate the hydration products and unhydrated phases in the cementitious slurry. First, the Ca/Si ratio (Ca/Si) of the composite cementitious system was calculated based on the mix ratio of raw materials of unfired bricks. Then, an experimental scheme of unfired bricks with varying amount of CaO was designed, and the Ca/Si ratio was quantitatively controlled within the range of 0.8~1.2. The mechanism of CaO improving the properties of high silicon composite cementitious materials was investigated by means of transmission electron microscopy (TEM) and energy spectrum (EDS) and PCAS software. The results show: with the increasing Ca/Si ratio within the range of 0.8~1.2, the mechanical properties of the unfired brick enhance first and then decrease. The optimal value of Ca/Si is 1.0, and there is also an optimal control value of CaO;With the increasing Ca/Si ratio, the water absorption decreases firstly and then increases for the bricks on the 7th day after they were made, and the water absorption decreases linearly for those on the 28th day;With the increasing Ca/Si ratio, the porosity of the plane pore size greater than 200 μm decreases for the prepared bricks, and the fractal dimension decreases first and then increases; For the pore size smaller than 200 μm, with the increase of Ca/Si, the pore size between 200 nm~200 μm decreases, and the pore size smaller than 200nm increases, while the pore size decreases; and Last but not least, the leaching amount of heavy metals from the unburned bricks can be inhibited up to more than 70% by the formed composite cementitious material.

Key words： composite baking-free bricks Ca/Si sludge mechanical property

收稿日期: 2021-02-09

ZTFLH:

TU526

基金资助:河南省自然科学基金(202300410270);华北水利水电大学研究生教育创新计划基金(YK2020-04);河南省水利科技攻关项目(GG202040)

作者简介: 郭磊,男,1980年生,教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.141 或 https://www.cjmr.org/CN/Y2022/V36/I4/278

表1 水泥物理和力学性能

表2 原材料化学成分(质量分数,%)

表3 污泥的力学性能

图1 骨料的级配曲线

表4 粗料的组成

图2 免烧砖的成型方式

Project	Standards	Calculation formula	Remarks
Compressive strength	GB/T 21144-2007	$R p = P L B$	P-max failure load; L-compression surface length;B-compression surface width
Water absorption	GB/T 4111-2013	$W = m 1 - m m × 100$ %	m₁-saturated specimens quality; m-oven dry quality

表5 计算免烧砖抗压强度和吸水率的公式

图3 PCAS分析

图4 胶凝材料的微观形貌

图5 Ca/Si比和龄期对抗压强度的影响

图6 28 d龄期不同Ca/Si比免烧砖的微观形貌

图7 Ca/Si比和龄期对吸水率的影响

图8 Ca/Si比对平面孔隙率和分形维数的影响

图9 Ca/Si比对微观孔结构的影响

图10 Ca/Si对各尺度孔结构分布的影响

表6 重金属测试结果

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