再生细骨料和砖粉双掺对3D打印混凝土性能的影响

doi:10.12141/j.issn.1000-565X.230020

华南理工大学学报(自然科学版) ›› 2024, Vol. 52 ›› Issue (3): 18-27.doi: 10.12141/j.issn.1000-565X.230020

再生细骨料和砖粉双掺对3D打印混凝土性能的影响

张海燕¹^,² 马金一¹ 吴波¹ 吕艳梅³

^1.华南理工大学土木与交通学院, 广东广州 510640
^2.广东省现代土木工程技术重点实验室, 广东广州 510640
^3.华南农业大学水利与土木工程学院, 广东广州 510642

收稿日期:2023-01-17 出版日期:2024-03-25 发布日期:2023-05-11
通信作者: 吴波（1968-），男，博士，研究员，主要从事建筑固废再生利用与结构抗灾研究。 E-mail:bowu@scut.edu.cn
作者简介:张海燕（1978-），女，博士，教授，主要从事建筑固废再生利用与结构抗灾研究。E-mail:Zhanghy@scut.edu.cn
基金资助:
广东省重点领域研发计划项目(2019B111107003);广东省现代土木工程技术重点实验室资助项目(2021B1212040003)

Effect of Recycled Fine Aggregate and Clay Brick Powder on Properties of 3D Printed Concrete

ZHANG Haiyan¹^,² MA Jinyi¹ WU Bo¹ LÜ Yanmei³

^1.School of Civil Engineering and Transportation，South China University of Technology，Guangzhou 510640，Guangdong，China
^2.Guangdong Provincial Key Laboratory of Modern Civil Engineering Technology，Guangzhou 510640，Guangdong，China
^3.College of Water Conservancy and Civil Engineering，South China Agricultural University，Guangzhou 510642，Guangdong，China

Received:2023-01-17 Online:2024-03-25 Published:2023-05-11
Contact: 吴波（1968-），男，博士，研究员，主要从事建筑固废再生利用与结构抗灾研究。 E-mail:bowu@scut.edu.cn
About author:张海燕（1978-），女，博士，教授，主要从事建筑固废再生利用与结构抗灾研究。E-mail:Zhanghy@scut.edu.cn
Supported by:
the Key Technologies R&D Program of Guangdong Province(2019B111107003);Guangdong Provincial Key Laboratory of Modern Civil Engineering Technology(2021B1212040003)

摘要/Abstract

摘要：

为减少3D打印混凝土中天然骨料及胶凝材料的用量，本文采用再生混凝土细骨料替代部分天然细骨料，砖粉替代部分水泥，首先开展单掺再生细骨料（取代率为0、25%、50%、75%和100%）、单掺砖粉（取代率为0、5%、10%、15%、20%和30%）和两者双掺的现浇混凝土的流动性和抗压强度试验，以获得再生细骨料和砖粉的适宜取代率；然后探究50%再生细骨料和10%砖粉双掺及配合比调整方式（附加水、提高减水剂用量）对3D打印混凝土拌合物性能及硬化后力学性能的影响。试验结果表明，当再生细骨料的掺量不超过50%时，现浇混凝土抗压强度降低幅度在10%以内；随着砖粉掺量从0增加到30%，现浇混凝土抗压强度总体呈现先增后减、再稍有增加的趋势，当砖粉掺量为10%时，混凝土抗压强度最高；相比于单掺50%再生细骨料的混凝土，50%再生细骨料和10%砖粉双掺时混凝土强度有所增加，而流动性基本不变。对于3D打印混凝土，同时掺入50%再生细骨料和10%砖粉，并采用添加附加水的方式保持3D打印混凝土初始扩展度不变，会使得混凝土的可建造性提高，但坍落度、开放时间、抗压和劈裂抗拉强度降低，强度各向异性加剧；而提高减水剂用量不仅能显著提升3D打印混凝土的流动性能、开放时间和抗压强度，还能降低打印试件的强度各向异性。

关键词: 3D打印混凝土, 再生细骨料, 砖粉, 打印性能, 硬化性能, 各向异性

Abstract:

In order to reduce the amount of natural aggregates and cementitious material in 3D printed concrete, this study used recycled fine aggregate (RFA) to partially replace natural fine aggregate and clay brick powder (CBP) to replace cement. The fluidity and compressive strength test of cast-in-situ concretes with RFA only (0, 25%, 50%, 75% and 100% replacement ratio), with CBP only (0, 5%, 10%, 15%, 20% and 30% replacement ratio) and with both of them were firstly carried out to obtain the optimal replacement ratio of RFA and CBP. Then, it investigated the effect of the addition of 50%RFA and 10%CBP and the corresponding mix proportion adjustment methods (adding extra water and increasing water reducer dosage) on the fresh and harden properties of 3D printed concrete. The test results indicate that the decreasing amplitude of the compressive strength of cast-in-situ concrete is within 10% when the replacement ratio of RFA is less than 50%. With the increase of CBP replacement ratio from 0 to 30%, the compressive strength of cast-in-situ concrete increases first, then decreases and then slightly increases. The specimen with CBP content of 10% exhibits the highest compressive strength. Compared to the concrete with 50%RFA only, the concrete with 50%RFA and 10%CBP has higher strength, while the fluidity is almost kept unchanged. For 3D printed concrete, the addition of 50% recycled fine aggregate and 10% brick powder and additional water can keep the initial expansion of 3D printed concrete unchanged and improve the buildability of concrete, but it can decrease the slump, opening time, compressive and split tensile strength and increase intensity anisotropy. However, increasing water reducer dosage in the mixture can not only significantly improve the fluidity, opening time and compressive strength of 3D printed concrete, but also reduce the intensity anisotropy.

Key words: 3D printed concrete, recycled fine aggregate, clay brick powder, printability, hardened property, anisotropy

中图分类号:

TU528

张海燕, 马金一, 吴波, 等. 再生细骨料和砖粉双掺对3D打印混凝土性能的影响[J]. 华南理工大学学报(自然科学版), 2024, 52(3): 18-27.

ZHANG Haiyan, MA Jinyi, WU Bo, et al. Effect of Recycled Fine Aggregate and Clay Brick Powder on Properties of 3D Printed Concrete[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(3): 18-27.

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组别	C	CBP	SF	FA	W	NFA	RFA	HPMC	PCE	PP
RFA0+CBP0	636.3	0.0	90.9	181.8	254.5	1 090.8	0.0	0.205	1.82	1.2
RFA25+CBP0	636.3	0.0	90.9	181.8	272.7	818.1	272.7	0.205	1.82	1.2
RFA50+CBP0	636.3	0.0	90.9	181.8	296.0	545.4	545.4	0.205	1.82	1.2
RFA75+CBP0	636.3	0.0	90.9	181.8	314.5	272.7	818.1	0.205	1.82	1.2
RFA100+CBP0	636.3	0.0	90.9	181.8	336.3	0.0	1 090.8	0.205	1.82	1.2
RFA0+CBP5	604.5	31.8	90.9	181.8	254.5	1 090.8	0.0	0.205	1.82	1.2
RFA0+CBP10	572.7	63.6	90.9	181.8	254.5	1 090.8	0.0	0.205	1.82	1.2
RFA0+CBP15	540.9	95.4	90.9	181.8	254.5	1 090.8	0.0	0.205	1.82	1.2
RFA0+CBP20	509.1	127.2	90.9	181.8	254.5	1 090.8	0.0	0.205	1.82	1.2
RFA0+CBP30	445.5	190.8	90.9	181.8	254.5	1 090.8	0.0	0.205	1.82	1.2
RFA50+CBP10	572.7	63.6	90.9	181.8	296.0	545.4	545.4	0.205	1.82	1.2
RFA50+CBP20	509.1	127.2	90.9	181.8	296.0	545.4	545.4	0.205	1.82	1.2

组别	C	CBP	SF	FA	W	NFA	RFA	HPMC	PCE	PP
RFA0+CBP0	636.3	0.0	90.9	181.8	254.5	1 090.8	0.0	0.205	1.82	1.2
RFA50+CBP10+W	572.7	63.6	90.9	181.8	296.0	545.4	545.4	0.205	1.82	1.2
RFA50+CBP10+PCE	572.7	63.6	90.9	181.8	254.5	545.4	545.4	0.205	3.36	1.2

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再生细骨料和砖粉双掺对3D打印混凝土性能的影响

Effect of Recycled Fine Aggregate and Clay Brick Powder on Properties of 3D Printed Concrete

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