硅灰-玻璃纤维全再生粗骨料混凝土力学性能研究

doi:10.16552/j.cnki.issn1001-1625.2025.0947

摘要/Abstract

摘要：

为探究硅灰和玻璃纤维对全再生粗骨料混凝土（FRCAC）力学性能的协同增强效应，采用再生粗骨料完全取代天然粗骨料制备FRCAC，分别掺入不同掺量的硅灰（0%、5%和10%，质量分数，下同）和玻璃纤维（0%、0.5%、1.0%和1.5%，体积分数，下同），系统测试FRCAC的工作性能和力学性能（立方体抗压强度、劈裂抗拉强度和抗折强度），并结合扫描电子显微镜分析其微观结构。结果表明：硅灰与玻璃纤维的协同效应可显著提高FRCAC力学性能，当硅灰掺量为10%、玻璃纤维掺量为1.0%时，与未掺硅灰和玻璃纤维的对照组相比，FRCAC的28 d立方体抗压强度、劈裂抗拉强度和抗折强度分别提高了26.1%、49.2%和45.5%。硅灰通过填充效应和二次水化反应生成的C-S-H凝胶不仅密实了水泥基体，还改善了玻璃纤维与水泥基体的界面过渡区结构，从而使纤维桥接阻裂作用得到充分发挥。本研究为推进建筑垃圾资源化利用提供了理论依据。

关键词: 全再生粗骨料混凝土, 硅灰, 玻璃纤维, 工作性能, 力学性能, 微观结构

Abstract:

To investigate the synergistic enhancement effects of silica fume and glass fiber on the mechanical properties of fully recycled coarse aggregate concrete （FRCAC）， natural coarse aggregates were fully replaced by recycled coarse aggregates to prepare FRCAC. Different content of silica fume （0%， 5% and 10%， mass fraction， the same below） and glass fiber （0%， 0.5%， 1.0% and 1.5%， volume fraction， the same below） were incorporated. The workability and mechanical properties （cubic compressive strength， splitting tensile strength， and flexural strength） of FRCAC were systematically tested， and its microstructure was analyzed using scanning electron microscopy （SEM）. The results indicate that the synergistic effect of silica fume and glass fiber significantly enhances the mechanical properties of FRCAC. When the silica fume content is 10% and the glass fiber content is 1.0%， the 28 d cubic compressive strength， splitting tensile strength， and flexural strength of FRCAC increased by 26.1%， 49.2%， and 45.5%， respectively， compared to the control group without silica fume or glass fibers. Silica fume， through its filling effect and the formation of C-S-H gel via secondary hydration reactions， not only densifies the cement matrix but also improves the structure of the interfacial transition zone between the glass fibers and the cement matrix. This enhancement allow the crack-bridging and resistance effects of the fibers to be fully utilized. This study provides a theoretical support for advancing the resource utilization of construction waste.

Key words: fully recycled coarse aggregate concrete, silica fume, glass fiber, workability, mechanical property, microstructure

中图分类号:

TU528.572

郭阳光, 秦拥军, 罗玲, 谌君诚, 李琦, 程昊. 硅灰-玻璃纤维全再生粗骨料混凝土力学性能研究[J]. 硅酸盐通报, 2026, 45(4): 1296-1303.

GUO Yangguang, QIN Yongjun, LUO Ling, CHEN Juncheng, LI Qi, CHENG Hao. Mechanical Properties of Silica Fume and Glass Fiber Fully Recycled Coarse Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(4): 1296-1303.

图/表 10

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Material	Mass fraction/%
Material	CaO	SiO₂	Al₂O₃	Fe₂O₃	SO₃	MgO	Other
Cement	52.77	23.40	6.82	4.44	4.06	2.46	6.05
Silica fume	0.38	96.38	1.07	—	0.46	0.67	1.04

Material	Mass fraction/%
Material	CaO	SiO₂	Al₂O₃	Fe₂O₃	SO₃	MgO	Other
Cement	52.77	23.40	6.82	4.44	4.06	2.46	6.05
Silica fume	0.38	96.38	1.07	—	0.46	0.67	1.04

Specimen	Mix proportion/（kg·m^-3）
Specimen	Cement	Recycled aggregate	Sand	Silica fume	Glass fiber	Water	Water reducer
S0G0	427.00	1 132	636	0	0	205	2.1
S0G0.5	427.00	1 132	636	0	13.4	205	2.1
S0G1.0	427.00	1 132	636	0	26.8	205	2.1
S0G1.5	427.00	1 132	636	0	40.2	205	2.1
S5G0	405.65	1 132	636	21.35	0	205	2.1
S5G0.5	405.65	1 132	636	21.35	13.4	205	2.1
S5G1.0	405.65	1 132	636	21.35	26.8	205	2.1
S5G1.5	405.65	1 132	636	21.35	40.2	205	2.1
S10G0	384.30	1 132	636	42.70	0	205	2.1
S10G0.5	384.30	1 132	636	42.70	13.4	205	2.1
S10G1.0	384.30	1 132	636	42.70	26.8	205	2.1
S10G1.5	384.30	1 132	636	42.70	40.2	205	2.1

Specimen	Mix proportion/（kg·m^-3）
Specimen	Cement	Recycled aggregate	Sand	Silica fume	Glass fiber	Water	Water reducer
S0G0	427.00	1 132	636	0	0	205	2.1
S0G0.5	427.00	1 132	636	0	13.4	205	2.1
S0G1.0	427.00	1 132	636	0	26.8	205	2.1
S0G1.5	427.00	1 132	636	0	40.2	205	2.1
S5G0	405.65	1 132	636	21.35	0	205	2.1
S5G0.5	405.65	1 132	636	21.35	13.4	205	2.1
S5G1.0	405.65	1 132	636	21.35	26.8	205	2.1
S5G1.5	405.65	1 132	636	21.35	40.2	205	2.1
S10G0	384.30	1 132	636	42.70	0	205	2.1
S10G0.5	384.30	1 132	636	42.70	13.4	205	2.1
S10G1.0	384.30	1 132	636	42.70	26.8	205	2.1
S10G1.5	384.30	1 132	636	42.70	40.2	205	2.1