消石灰固化CFB灰渣基可控低强度材料的强度与膨胀性能

doi:10.16552/j.cnki.issn1001-1625.2026.0216

硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (9): 3140-3150.DOI: 10.16552/j.cnki.issn1001-1625.2026.0216

消石灰固化CFB灰渣基可控低强度材料的强度与膨胀性能

彭双¹(), 高鹏²(), 周明凯¹, 薛秀³, 王宇强², 秦志庆⁴

^1.武汉理工大学材料科学与工程学院，武汉 430070
^2.长治市武理工工程技术研究院，长治 046004
^3.山西三建集团有限公司，长治 046000
^4.山西省煤系固废建材资源化利用技术创新中心，长治 047599

收稿日期:2026-03-10 修订日期:2026-04-21 出版日期:2026-09-15 发布日期:2026-10-09
通信作者: 高鹏，硕士研究生，助理研究员。E-mail：13572186187@163.com
作者简介:彭双（2000—），女，硕士研究生。主要从事固废资源化利用方面的研究。E-mail：2849700747@qq.com
基金资助:
长治市重点研发项目(2024ZDYF011)

Strength and Expansion Properties of Hydrated Lime-Solidified CFB Ash-Slag-Based Controlled Low-Strength Material

PENG Shuang¹(), GAO Peng²(), ZHOU Mingkai¹, XUE Xiu³, WANG Yuqiang², QIN Zhiqing⁴

^1.School of Materials Science and Engineering，Wuhan University of Technology，Wuhan 430070，China
^2.Institute of Wuhan University of Technology，Changzhi 046004，China
^3.Shanxi Sanjian Co. ，Ltd. ，Changzhi 046000，China
^4.Shanxi Coal Measures Solid Waste Building Materials Resource Utilization Technology Innovation Center，Changzhi 047599，China

Received:2026-03-10 Revised:2026-04-21 Published:2026-09-15 Online:2026-10-09

摘要/Abstract

摘要：

利用消石灰与循环流化床锅炉灰渣（CFB灰渣）的协同激发作用制备可控低强度材料（CLSM）。针对消石灰固化CFB灰渣基CLSM膨胀性能的发展规律、影响因素及机理尚不明确的问题，研究了灰渣比、消石灰掺量和用水量对CLSM固结体无侧限抗压强度和线性膨胀率的影响。结合XRD、SEM和热重分析，分析了反应产物特征及其作用机理。结果表明，在本试验范围内，灰渣比为40∶60时，28 d无侧限抗压强度达到最大值，为7.7 MPa；灰渣比增加仅使线性膨胀率小幅上升。消石灰掺量为最显著的影响因素，当掺量为0%～25%时，CLSM固结体的无侧限抗压强度和线性膨胀率均随消石灰掺量增加而显著提升；掺量由0%增至5%时，28 d无侧限抗压强度由0.7 MPa提高至6.2 MPa，线性膨胀率由0%增至1.0%，增幅最明显。用水量的增加显著降低了CLSM固结体线性膨胀率，用水量从590 kg/m³增加到650 kg/m³，线性膨胀率降低了62.5%。微观分析表明，消石灰化CFB灰渣形成的主要水化产物为钙矾石（AFt）、水化硅酸钙（C-S-H）凝胶和水化硅铝酸钙（C-A-S-H）凝胶；AFt主要在早期生成，凝胶相在后期持续发展。用水量增加会使体系结构疏松、孔隙增多，从而削弱固结体的强度与膨胀性能。

关键词: CFB灰渣, 消石灰, 可控低强度材料, 碱激发, 抗压强度, 膨胀性能

Abstract:

Controlled low-strength material （CLSM） was prepared through the synergistic activation of hydrated lime and circulating fluidized bed fly ash and slag （CFB ash-slag）. To clarify the development behavior， influencing factors， and mechanism of expansion properties in hydrated lime-solidified CFB ash-slag-based CLSM， the effects of ash-slag ratio， hydrated lime content， and water dosage on the unconfined compressive strength and linear expansion rate of the hardened CLSM specimens were investigated. XRD， SEM， and thermogravimetric analyses were employed to characterize the reaction products and elucidate their mechanisms. The results show that， within the tested range， the 28 d unconfined compressive strength reaches a maximum of 7.7 MPa at an ash-slag ratio of 40∶60， while increasing the ash-slag ratio causes only a slight rise in the linear expansion rate. Hydrated lime content is identified as the most significant factor. In the range from 0% to 25%， both the unconfined compressive strength and linear expansion rate of the hardened CLSM specimens increase markedly with increasing hydrated lime content. When the hydrated lime content increases from 0% to 5%， the 28 d unconfined compressive strength increases from 0.7 MPa to 6.2 MPa， and the linear expansion rate increases from 0% to 1.0%，showing the most remarkable growth. Increasing the water dosage significantly reduces the linear expansion rate of the hardened CLSM specimens； when the water dosage increases from 590 kg/m³ to 650 kg/m³， the linear expansion rate decreases by 62.5%. Microstructural analysis indicates that the main hydration products formed in the hydrated lime-solidified CFB ash-slag system are ettringite （AFt）， calcium silicate hydrate （C-S-H） gel， and hydrated calcium silicate aluminate （C-A-S-H） gel. AFt is mainly generated at the early stage， whereas the gel phases continue to develop at later ages. An increase in water dosage leads to a looser structure and higher porosity， thereby weakening both the strength and expansion properties of the hardened CLSM specimens.

Key words: CFB ash-slag, hydrated lime, controlled low-strength material, alkali-activation, compressive strength, expansion property

中图分类号:

U414

彭双, 高鹏, 周明凯, 薛秀, 王宇强, 秦志庆. 消石灰固化CFB灰渣基可控低强度材料的强度与膨胀性能[J]. 硅酸盐通报, 2026, 45(9): 3140-3150.

PENG Shuang, GAO Peng, ZHOU Mingkai, XUE Xiu, WANG Yuqiang, QIN Zhiqing. Strength and Expansion Properties of Hydrated Lime-Solidified CFB Ash-Slag-Based Controlled Low-Strength Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(9): 3140-3150.

图/表 17

表1 CFBFA的主要化学组成

Table 1 Main chemical composition of CFBFA

Composition	Al₂O₃	SiO₂	SO₃	CaO	Fe₂O₃	MgO	LOI	f-CaO	Anhydrite
Mass fraction/%	23.5	34.7	9.1	16.5	4.0	0.7	11.3	0.39	8.66

图1 CFBFA的XRD谱

Fig.1 XRD pattern of CFBFA

表2 原始CFBS的颗粒级配

Table 2 Particle gradation of raw CFBS

Sieve size/mm	9.50	4.75	2.36	1.18	0.60	0.30	0.15
Cumulative residue mass fraction/%	0	9	21	35	49	75	84

图2 CFBS的SEM照片

Fig.2 SEM image of CFBS

表3 CFBS的主要化学组成

Table 3 Main chemical composition of CFBS

Composition	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	SO₃	LOI	f-CaO	Anhydrite
Mass fraction/%	46.6	29.3	3.6	7.1	0.6	6.4	3.7	3.6	4.0

图3 CFBS的XRD谱

Fig.3 XRD pattern of CFBS

表4 消石灰固化CFB灰渣CLSM配合比

Table 4 Mix proportion of hydrated lime-solidified CFB ash-slag CLSM

Group	Mass fraction/%			Water content/（kg·m^-3）	W/S
Group	CFBFA	CFBS	Hydrated lime content	Water content/（kg·m^-3）	W/S
A30S70	30	70	15	620	0.62
A40S60	40	60	15	620	0.62
A50S50	50	50	15	620	0.62
L0	40	60	0	620	0.62
L1	40	60	1	620	0.62
L3	40	60	3	620	0.62
L5	40	60	5	620	0.62
L15	40	60	15	620	0.62
L25	40	60	25	620	0.62
W590	40	60	15	590	0.59
W620	40	60	15	620	0.62
W650	40	60	15	650	0.65

图4 不同灰渣比下CLSM固结体无侧限抗压强度和线性膨胀率

Fig.4 Unconfined compressive strength and linear expansion ratio of hardened CLSM specimens with different ash-slag ratios

图5 不同消石灰掺量下CLSM固结体无侧限抗压强度和线性膨胀率

Fig.5 Unconfined compressive strength and linear expansion ratio of hardened CLSM specimens with different hydrated lime content

图6 不同消石灰掺量下CLSM固结体28 d无侧限抗压强度与线性膨胀率的关系

Fig.6 28 d unconfined compressive strength and linear expansion ratio of hardened CLSM specimens with different hydrated lime content

图7 不同消石灰掺量下CLSM固结体的XRD谱与TG-DSC曲线

Fig.7 XRD patterns and TG-DSC curves of hardened CLSM specimens with different hydrated lime content

图8 L5组CLSM固结体28 d的SEM照片和EDS元素分析

Fig.8 SEM image and EDS elemental analysis of hardened CLSM specimen of L5 group at 28 d

图9 L5组CLSM固结体7、28 d的XRD谱

Fig.9 XRD patterns of hardened CLSM specimen of L5 group at 7 and 28 d

图10 不同用水量下CLSM固结体无侧限抗压强度和线性膨胀率

Fig.10 Unconfined compressive strength and linear expansion ratio of hardened CLSM specimens with different water content

图11 不同用水量CLSM固结体28 d的TG-DSC曲线

Fig.11 TG-DSC curves of 28 d hardened CLSM specimens with different mixing water content

图12 不同用水量CLSM固结体28 d水化产物的SEM照片

Fig.12 SEM images of hydration products of hardened CLSM specimens at 28 d under different water content

图13 W620组CLSM固结体的SEM照片和EDS元素分析

Fig.13 SEM images and EDS elemental analysis of hardened CLSM specimen in W620 group

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消石灰固化CFB灰渣基可控低强度材料的强度与膨胀性能

Strength and Expansion Properties of Hydrated Lime-Solidified CFB Ash-Slag-Based Controlled Low-Strength Material

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