Mechanical Property and Microstructure of Cement Mortar with Carbonated Recycled Powder

Abstract

Carbonated recycled powder as cementitious auxiliary material can reduce carbon emissions and realize high-quality recycling of recycled concrete. In this paper, microscopic property of recycled powder with three carbonation methods was tested through XRD and SEM, the mechanical property and microstructure of recycled powder mortar with three replacement rates were studied by ISO method and SEM, and the strengthening mechanism was analyzed. The results showed that the mechanical property of recycled powder mortar decreased with the increasing of replacement rate. It is suggested that the replacement rate of recycled powder should not exceed 20%. The strength index and activity index of carbonated recycled powder mortar were improved, in which the flexural strength was increased by 27.85% and compressive strength was increased by 20% at the maximum. Recycled powder can be quickly and completely carbonated, and the improvement effect of CH pre-soaking carbonation was the best. The activity index of carbonated recycled powder can meet the requirements of Grade II technical standard for recycled powder. Microscopic results revealed the activation mechanism of carbonated recycled powder such as surplus calcium source effect, alkaline polycondensation effect and carbonation enhancement effect.

Keywords

recycled powder / carbonation activation / compound carbonation / activity index / mechanical property / microstructure

References

[1] Sun C, Chen L, Xiao J, et al. Compound Utilization of Construction and Industrial Waste as Cementitious Recycled Powder in Mortar[J]. Resources, Conservation and Recycling, 2021, 170: 105 561.

[2] Shen P, Sun Y, Liu S, et al. Synthesis of Amorphous Nano-silica from Recycled Concrete Fines by Two-step Wet Carbonation[J]. Cement and Concrete Research, 2021, 147: 106 526.

[3] Hasanbeigi A, Menke C, Price L. The CO₂ Abatement Cost Curve for the Thailand Cement Industry[J]. Journal of Cleaner Production, 2010, 18(15): 1 509-1 518.

[4] Kamali M, Ghahremaninezhad A. An Investigation into the Hydration and Microstructure of Cement Pastes Modified with Glass Powders[J]. Construction and Building Materials, 2016, 112: 915-924.

[5] Alnahhal M F, Alengaram U J, Jumaat M Z, et al. Assessment on Engineering Properties and CO₂ Emissions of Recycled Aggregate Concrete Incorporating Waste Products as Supplements to Portland Cement[J]. Journal of Cleaner Production, 2018, 203: 822-835.

[6] Fořt J, Vejmelková E, Koňáková D, et al. Application of Waste Brick Powder in Alkali Activated Aluminosilicates: Functional and Environmental Aspects[J]. Journal of Cleaner Production, 2018, 194: 714-725.

[7] Tang Q, Ma Z, Wu H, et al. The Utilization of Eco-friendly Recycled Powder from Concrete and Brick Waste in New Concrete: A Critical Review[J]. Cement and Concrete Composites, 2020, 114: 103 807.

[8] Gao T, Shen L, Shen M, et al. Analysis on Differences of Carbon Dioxide Emission from Cement Production and Their Major Determinants[J]. Journal of Cleaner Production, 2015, 103: 160-170.

[9] Housing and Urban-Rural Development of the People’s Republic of China. Recycled Fine Powder for Concrete and Mortar[S]. JG/T573-2020, 2020

[10] Seung-Hwan L, Ik-Chang C, Sang-Kuk H. Analysis on the Harmful Effect of Recycled Powder and Properties of Concrete Admixture by Recycled Powder[J]. Journal of the Korean Society of Marine Environment & Safety, 2008, 14(4): 289-295.

[11] Tian Q, Qu M, Zhang M, et al. Research Progress on Activation Methods of Recycled Powder of Waste Concrete[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(08): 2 476-2 485. (in Chinese)

[12] Xiao J, Ma Z, Sui T, et al. Mechanical Properties of Concrete Mixed with Recycled Powder Produced from Construction and Demolition Waste[J]. Journal of Cleaner Production, 2018, 188: 720-731.

[13] Prošek Z, Trejbal J, Nežerka V, et al. Recovery of Residual Anhydrous Clinker in Finely Ground Recycled Concrete[J]. Resources, Conservation and Recycling, 2020, 155: 104 640.

[14] Ying L, Xiaoming K. Effect of Physical Excitation on the Properties of Recycled Fine Powder[J]. IOP Conference Series: Earth and Environmental Science, 2019, 219(1): 012 025

[15] Liu X, Liu L, Lyu K, et al. Enhanced Early Hydration and Mechanical Properties of Cement-based Materials with Recycled Concrete Powder Modified by Nano-silica[J]. Journal of Building Engineering, 2022, 50: 104 175.

[16] Wu H, Xu J, Yang D, et al. Utilizing Thermal Activation Treatment to Improve the Properties of Waste Cementitious Powder and Its New Made Cementitious Materials[J]. Journal of Cleaner Production, 2021, 322: 129 074.

[17] Meng T, Hong Y, Ying K, et al. Comparison of Technical Properties of Cement Pastes with Different Activated Recycled Powder from Construction and Demolition Waste[J]. Cement and Concrete Composites, 2021, 120: 104 065.

[18] Baojian Z, Chi S P, Qiong L, et al. Experimental Study on CO₂ Curing for Enhancement of Recycled Aggregate Properties[J]. Construction and Building Materials, 2014, 67: 3-7.

[19] Jiake Z, Caijun S, Yake L, et al. Performance Enhancement of Recycled Concrete Aggregates through Carbonation[J]. Journal of Materials in Civil Engineering, 2015, 27(11): 04 015 029

[20] Bao J Z, Dong X X, Chi S P. Enhancement of Recycled Aggregate Properties by Accelerated CO₂ Curing Coupled with Limewater Soaking Process[J]. Cement and Concrete Composites, 2018, 89: 230-237.

[21] Bao J Z, Dong X X, Chi S P, et al. Characterization of Interfacial Transition Zone in Concrete Prepared with Carbonated Modeled Recycled Concrete Aggregates[J]. Cement and Concrete Research, 2020, 136: 106 175.

[22] Dongxing X, Baojian Z, Chi S P. Development of a New Generation of Eco-friendly Concrete Blocks by Accelerated Mineral Carbonation[J]. Journal of Cleaner Production, 2016, 133: 1 235-1 241.

[23] Xiao J, Xiao Y, Liu Y, et al. Carbon Emission Analyses of Concretes Made with Recycled Materials Considering CO₂ Uptake through Carbonation Absorption[J]. Structural Concrete, 2020, 22(S1): E58-E73.

[24] Lu B, Shi C, Zhang J, et al. Effects of Carbonated Hardened Cement Paste Powder on Hydration and Microstructure of Portland Cement[J]. Construction and Building Materials, 2018, 186: 699-708.

[25] LIU Qi, WU Shengkun, LI Linkun, et al. Influence of Low Concentration CO₂ Mineralization on Physicochemical Properties of Recycled Powder[J]. Clean Coal Technology, 2022: 1–11(in Chinese)

[26] Kang X, Li Y, Fan Y. Basic Properties of Recycled Powder and Its Effect on the Properties of Mortar[J]. Journal of Qinghai University, 2019, 37(01): 18-23. (in Chinese)

[27] Bian Y, Li Z, Zhao J, et al. Synergistic Enhancement Effect of Recycled Fine Powder (RFP) Cement Paste and Carbonation on Recycled Aggregates Performances and Its Mechanism[J]. Journal of Cleaner Production, 2022, 344: 130 848.

[28] Zhenhua D, Amardeep S, Jianzhuang X, et al. Combined Use of Recycled Powder and Recycled Coarse Aggregate Derived from Construction and Demolition Waste in Self-compacting Concrete[J]. Construction and Building Materials, 2020, 254(C): 119 323

[29] Shi C, Li Y, Zhang J, et al. Performance Enhancement of Recycled Concrete Aggregate -A Review[J]. Journal of Cleaner Production, 2016, 112: 466-472.

[30] Lagerblad B. Carbon Dioxide Uptake During Concrete Life Cycle-State of the Art[M], 2005 Sweden: Swedish Cement and Concrete Research Institute - CBI.

[31] YANG Nanru. Physicochemical Basis for the Formation of Alkali Cementitious Materials (I) [J]. Journal of the Chinese Ceramic Society, 1996 (02): 209–215(in Chinese)

[32] Wang J, Xu H, Xu D, et al. Accelerated Carbonation of Hardened Cement Pastes: Influence of Porosity[J]. Construction and Building Materials, 2019, 225: 159-169.

[33] Kaddah F, Ranaivomanana H, Amiri O, et al. Accelerated Carbonation of Recycled Concrete Aggregates: Investigation on the Microstructure and Transport Properties at Cement Paste and Mortar Scales[J]. Journal of CO2 Utilization, 2022, 57: 101 885.

[34] Pu Y, Li L, Wang Q, et al. Accelerated Carbonation Technology for Enhanced Treatment of Recycled Concrete Aggregates: A State-of-the-Art Review[J]. Construction and Building Materials, 2021, 282: 122 671.