Influence of Carbonized Recycled Cement Concrete Powder on Performance of Foamed Concrete

doi:10.16552/j.cnki.issn1001-1625.2025.1151

Abstract

Abstract:

Under the background of the “double carbon” target， the high energy consumption and high emission problems of the cement industry need to be solved urgently. The resource utilization of construction solid waste has become an important way for the development of low-carbon building materials. In this study， ordinary Portland cement was used as the matrix， and recycled cement concrete powder （RCCP） and carbonated recycled cement concrete powder （carbonated RCCP） were prepared by accelerated carbonation treatment. Foamed concrete was prepared by replacing cement with 0%， 20%， 40% and 60% （mass fraction） RCCP and carbonated RCCP respectively. The effect of carbonated RCCP on the workability， microstructure and thermal properties of foamed concrete was analyzed by fluidity， dry density， water absorption rate， compressive strength， XRD， TG-DSC， SEM， microCT and thermal conductivity coefficient tests. The results show that with the increase of RCCP substitution rate， the fluidity of slurry decreases. When the substitution rate is 60%， the fluidity of carbonated and uncarbonated samples decreases by about 8.0% and 11.0% respectively compared with the reference sample. With the increase of the substitution rate of carbonated RCCP， the compressive strength of sample increases first and then decreases. When the substitution rate is 20%， the 28 d compressive strength reaches the peak value， which is 6.3% higher than that of RCCP sample. With the increase of RCCP substitution rate， the porosity increases， the thermal conductivity performance is improved. When the substitution rate of carbonated RCCP is 60%， the thermal conductivity is 6.8% lower than that of RCCP sample.

Key words: foamed concrete, recycled cement concrete powder, carbonation, mechanical property, thermal insulation property

CLC Number:

TU528

HE Yanhui, WANG Huan, ZOU Yong, CHEN Cheng, XU Peng, HE Zhihao. Influence of Carbonized Recycled Cement Concrete Powder on Performance of Foamed Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(6): 2063-2074.

Figures/Tables 22

Table 1 Main chemical composition of raw materials

Raw material	Mass fraction/%
Raw material	CaO	SiO₂	MgO	Al₂O₃	Fe₂O₃	K₂O	Na₂O	SO₃	LOI
Cement	50.10	26.50	4.30	8.00	3.30	0.85	0.55	2.95	3.40
RCCP	31.80	20.10	8.90	4.90	1.30	0.75	0.70	0.65	30.90
Attapulgite	1.90	47.90	9.10	9.30	4.50	0.95	5.80	—	19.30

Fig.1 Closed carbonated device

Fig.2 Carbonization curve of carbonated RCCP

Fig.3 Particle size distribution of RCCP and carbonated RCCP

Table 2 Mix proportion design of foamed concrete

Sample	Mix proportion/（kg·m^-3）						SP content/%	W/B
Sample	Cement	Attapulgite	RCCP	Carbonated RCCP	Water	Foam	SP content/%	W/B
Ref	450	90	0	0	324	15	0.8	0.6
R20	360	90	90	0	324	16	0.8	0.6
R40	270	90	180	0	324	18	0.8	0.6
R60	180	90	270	0	324	20	0.8	0.6
C20	360	90	0	90	324	16	0.8	0.6
C40	270	90	0	180	324	18	0.8	0.6
C60	180	90	0	270	324	20	0.8	0.6

Fig.4 Thermal conductivity performance test equipment and test area

Fig.5 Infrared thermal imager and temperature monitoring

Fig.6 Effect of RCCP substitution rate before and after carbonation on slurry fluidity

Fig.7 Bingham model fitting results

Fig.8 Dry density and water absorption rate curves of FC at 28 d

Fig.9 Compressive strength of FC

Fig.10 Correlation analysis of FC dry density， water

Fig.11 XRD patterns of foamed concrete samples

Fig.12 TG and DTG curves of different samples

Fig.13 SEM images of samples at 28 d age（low magnification）

Fig.14 SEM images of samples at 28 d age （high magnification）

Fig.15 3D microCT images of samples

Fig.16 2D microCT images of samples

Fig.17 Pore size distribution of FC

Table3 Pore structure characterization of FC

Sample	Average diameter /µm	Porosity/%	Correlation coefficient
Ref	53.49	41.32	0.96
C60	82.73	52.48	0.92
R60	89.64	56.69	0.97

Fig.18 Thermal conductivity coefficient of FC

Fig.19 Temperature difference change of FC

References 21

[1]	宋　强，张　鹏，鲍玖文，等. 泡沫混凝土的研究进展与应用［J］. 硅酸盐学报， 2021（2）， 49（2）： 398-410.
	SONG Q， ZHANG P， BAO J W， et al. Research progress and application of foamed concrete［J］. Journal of the Chinese Ceramic Society， 2021， 49（2）： 398-410 （in Chinese）.
[2]	宋　强，邹颖杰，张　鹏，等. 泡沫混凝土气泡性能与基体材料研究进展［J］. 硅酸盐学报， 2024， 52（2）： 706-724.
	SONG Q， ZOU Y J， ZHANG P， et al. Research progress on foam performance and matrix materials for foam concrete［J］. Journal of the Chinese Ceramic Society， 2024， 52（2）： 706-724 （in Chinese）.
[3]	关蕾蕾，陈永贵，叶为民，等. 泡沫混凝土收缩及其抑制方法研究进展［J］. 土木工程学报， 2023， 56（3）： 32-43.
	GUAN L L， CHEN Y G， YE W M， et al. Research develpments in shrinkage and shrinkage inhibition methods of foamed concrete［J］. China Civil Engineering Journal， 2023， 56（3）： 32-43 （in Chinese）.
[4]	耿春雷，郭宏达，董　阳，等. 陶粒泡沫混凝土成型方式及性能研究［J］. 硅酸盐通报， 2025， 44（1）： 124-132. DOI
	GENG C L， GUO H D， DONG Y， et al. Forming methods and properties of ceramsite foam concrete［J］. Bulletin of the Chinese Ceramic Society， 2025， 44（1）： 124-132 （in Chinese）. DOI
[5]	洪志龙，曾嘉令，周楚鸿，等. 泡沫混凝土保温材料研究综述［J］. 土木工程， 2024（7）： 1226-1231.
	HONG Z L， ZENG J L， ZHOU C H， et al. Summary of foam concrete insulation materials［J］. Hans Journal of Civil Engineering， 2024（7）： 1226-1231 （in Chinese）.
[6]	MUGAHED AMRAN Y H， FARZADNIA N， ABANG ALI A A. Properties and applications of foamed concrete： a review［J］. Construction and Building Materials， 2015， 101： 990-1005. DOI URL
[7]	SHAH S N， MO K H， YAP S P， et al. Lightweight foamed concrete as a promising avenue for incorporating waste materials： a review［J］. Resources， Conservation and Recycling， 2021， 164： 105103.
[8]	姜　义，马梓涵，申培亮，等. 废弃混凝土碳化资源化技术研究进展［J］. 硅酸盐学报， 2023， 51（9）： 2433-2445.
	JIANG Y， MA Z H， SHEN P L， et al. Research progress on carbonation technologies for valorising waste concrete： a review［J］. Journal of the Chinese Ceramic Society， 2023， 51（9）： 2433-2445 （in Chinese）.
[9]	梁　芮，于　江，秦拥军. 废弃混凝土再生骨料的研究综述［J］. 混凝土， 2013（5）： 93-96+100.
	LIANG R， YU J， QIN Y J. Research summarize on waste concrete recycled aggregate［J］. Concrete， 2013（5）： 93-96+100 （in Chinese）.
[10]	程　欢，李化建，黄法礼，等. 废弃混凝土再生砂的吸附特性研究［J］. 硅酸盐通报， 2024， 43（6）： 2198-2205.
	CHENG H， LI H J， HUANG F L， et al. Adsorption characteristics of recycled sand derived from waste concrete［J］. Bulletin of the Chinese Ceramic Society， 2024， 43（6）： 2198-2205 （in Chinese）.
[11]	JIANG Y， LI B， LIU S， et al. Role of recycled concrete powder as sand replacement in the properties of cement mortar［J］. Journal of Cleaner Production， 2022， 371： 133424. DOI URL
[12]	TOPIČ J， PROŠEK Z. Properties and microstructure of cement paste including recycled concrete powder［J］. Acta Polytechnica， 2017， 57（1）： 49-57. DOI URL
[13]	付　勇，薛翠真，何江红，等. 混凝土再生微粉颗粒特征及其砂浆性能研究［J］. 材料导报， 2022， 36（10）： 94-99.
	FU Y， XUE C Z， HE J H， et al. Study on the particle characteristics of recycled concrete powder and the performance of mortar［J］. Materials Review， 2022， 36（10）： 94-99 （in Chinese）.
[14]	CHEN X， LI Y， BAI H L， et al. Utilization of recycled concrete powder in cement composite： strength， microstructure and hydration characteristics［J］. Journal of Renewable Materials， 2021， 9（12）： 2189-2208. DOI URL
[15]	李茂森，王　露，王　军，等. 大掺量矿物掺合料混凝土碳化行为研究进展［J］. 硅酸盐通报， 2023， 42（11）： 3787-3798.
	LI M S， WANG L， WANG J， et al. Research progress on carbonation behavior of concrete with large volume of mineral admixture［J］. Bulletin of the Chinese Ceramic Society， 2023， 42（11）： 3787-3798 （in Chinese）.
[16]	YANG L， ZHU Z D， SUN H， et al. Durability of waste concrete powder-based geopolymer reclaimed concrete under carbonization and freeze-thaw cycles［J］. Construction and Building Materials， 2023， 403： 133155. DOI URL
[17]	FANG X L， XUAN D X， ZHAN B J， et al. Characterization and optimization of a two-step carbonation process for valorization of recycled cement paste fine powder［J］. Construction and Building Materials， 2021， 278： 122343. DOI URL
[18]	TANG Y X， XIAO J Z， WANG D C， et al. Effect of carbonation treatment on fracture behavior of low-carbon mortar with recycled sand and recycled powder［J］. Cement and Concrete Composites， 2023， 142： 105178. DOI URL
[19]	张煊铭，刘明阳. 建筑固废基再生混凝土的抗碳化研究［J］. 河北水利电力学院学报， 2024， 34（2）： 8-12.
	ZHANG X M， LIU M Y. Building solid waste recycled concrete carbonation resistance research［J］. Journal of Hebei University of Water Resources and Electric Engineering， 2024， 34（2）： 8-12 （in Chinese）.
[20]	王开元，萧圳坡，寇世聪，等. 碳化处理对再生微粉吸附Pb²⁺行为与机理的影响［J］. 硅酸盐通报， 2024， 43（4）： 1420-1426.
	WANG K Y， XIAO Z P， KOU S C， et al. Effect of carbonization treatment on behavior and mechanism of Pb²⁺ adsorption by recycled concrete fines［J］. Bulletin of the Chinese Ceramic Society， 2024， 43（4）： 1420-1426 （in Chinese）.
[21]	LI G Y， TAN H B， HE X Y， et al. The influence of wet ground fly ash on the performance of foamed concrete［J］. Construction and Building Materials， 2021， 304： 124676. DOI URL