Article
Engineering, Environmental
Zengqi Zhang, Qiang Wang, Zongxian Huang
Summary: This study proposes a high value-added utilization approach of copper slag to enhance the early performance of magnesium potassium phosphate cement (MPC). The experimental results show that the addition of copper slag can significantly increase the early compressive strength of MPC mortar, and the crystalline phases in copper slag can react with hydrates in the MPC system, increasing their content.
RESOURCES CONSERVATION AND RECYCLING
(2022)
Article
Construction & Building Technology
Yanjiao Zhu, Zhen Wang, Zhifeng Li, Haibin Yu
Summary: By partially replacing magnesium oxide (MgO) with gold mine tailings (GT) in cement, the paper found improved workability and compressive strength, along with a denser microstructure. Incorporating GT in the cement structure leads to the formation of new types of hydrates, enhancing compressive strength. Partial replacement of M reduces costs and enhances the mechanical properties of MKPC.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Wenqiang Ruan, Yihan Ma, Jianguo Liao, Tingting Ma, Yu Zhu, Aiguo Zhou
Summary: This paper investigates the effects of steel slag addition on the strength and water resistance of magnesium phosphate cement (MPC), and proposes a hydration mechanism. The results show that with the addition of steel slag, the strength and water resistance of MPC are significantly enhanced. The steel slag also improves the compactness and stability of the cement.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Tao Li, Gang Chen, Jianming Yang, Linlin Chong, Xiamin Hu
Summary: This study investigated the effects of different curing conditions on the hydration performance and mechanical properties of magnesium potassium phosphate cement (MKPC). The results showed that early moist air curing and low-temperature water-bath curing improved the compressive strength and volume stability of the MKPC paste. However, water immersion and high-temperature water-bath curing had detrimental effects. Microstructural analysis indicated the instability and partial dissolution of K-struvite in water, with the formation of new precipitates. Early moist air curing and low-temperature elevating curing resulted in faster strength development and good volume stability for the MKPC paste, but further increase in humidity and curing temperature led to porous structures and negative effects on dimensional stability and strength.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Materials Science, Ceramics
Zhi-hai He, Hao-nan Zhu, Jin-yan Shi, Jing Li, Qiang Yuan, Cong Ma
Summary: The effect of metakaolin on the setting time, fluidity and early-ages strength of magnesium potassium phosphate cement was studied, and it was found that incorporating an appropriate amount of metakaolin improves the mechanical properties, fluidity, and shrinkage of the cement specimens.
CERAMICS INTERNATIONAL
(2022)
Article
Construction & Building Technology
Baoying Yu, Jianwei Zhou, Baojun Cheng, Wen Yang
Summary: The study found that the hardened MPC stone is a ceramic-like structure, which will be disrupted when aggregate is added, resulting in a weak interface transition zone, but still maintaining a high compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Xiaobing Dai, Wenxiao Ren, Jihui Qin, Xingwen Jia, Jueshi Qian
Summary: This study investigated the impact of borax content on the physic-mechanical properties and microstructure of MKPC at high temperatures. Borax influenced the performance of MKPC by altering the phase composition and structure at elevated temperatures. At around 800 degrees C, borax could react with magnesia to form Mg3B2O6. The porosity of MKPC decreased at temperatures higher than 900 degrees C due to the melting of Mg3B2O6. With an increase in borax content from 3% to 15%, MKPC exhibited a denser structure and higher strength at 1100 degrees C. Excellent dimensional stability of MKPC at high temperatures can be achieved with a low borax content.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Shanliang Ma, Zengqi Zhang, Xiaoming Liu, Yantian Li, Qingsen Zeng, Wei Zhang
Summary: This study proposes a new method of reusing red mud as a mineral admixture in magnesium potassium phosphate cement (MKPC), which improves its performance and reduces preparation cost. The addition of red mud increases the fluidity and prolongs the setting time of MKPC paste, and also enhances the microstructure of MKPC through physical filling effects and chemical effects.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Hu Feng, Ahmed Jawad Shaukat, David Rin, Pu Zhang, Danying Gao, M. Neaz Sheikh
Summary: The incorporation of up to 30% fly ash significantly improved the ductility of the HDMPCC. The composite with 30% fly ash, W/B ratio of 0.14, and S/B ratio of 0.12 exhibited the highest strain corresponding to peak tensile stress at 0 degrees C. The ultimate tensile stress ranged from 0.41% to 2.22%, with the highest of about 1.28 MPa observed for HDMPCC specimens cured at low temperatures.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Alaa M. Rashad, Ashraf K. Eessaa, Mervat H. Khalil, O. A. Mohamed
Summary: For the first time, the possibility of adding nano-zirconium (NZ) into alkali-activated slag (AAS) cement as a modifier against seawater attack was studied in this article. Different ratios of NZ were added into the neat AAS cement, and their effects on workability and compressive strength were measured. The results showed that the incorporation of 1% and 3% NZ had a positive effect on compressive strength before and after exposure to different media, while the incorporation of 5% had a negative effect.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Runhua Guo, Jin Liu
Summary: This paper investigates the reaction process and hydration product of magnesium phosphate cement containing copper slag, as well as tests the setting time of cement and compressive strength of mortar. The results show that copper slag retards the setting of magnesium phosphate cement and the compressive strength of mortar containing copper slag is close to the control sample.
JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS
(2023)
Article
Chemistry, Physical
Yuanquan Yang, Bodong Fang, Guanhua Zhang, Jinbo Guo, Runqing Liu
Summary: This study investigated the effects of a candidate retarder, sodium alginate, on the hydration and properties of magnesium potassium phosphate cements (MKPCs). The results showed that 1% sodium alginate could effectively extend the setting time and improve the early strength of MKPCs. Sodium alginate had minimal impact on the formation of hydration products in the long term, but it did reduce the compressive strength of MKPCs.
Article
Construction & Building Technology
Zizhang Zhan, Wei Sun, Shuaishuai Zhang, Qingbo Wen, Hongbo Zhang, Xiang Xiong
Summary: The addition of ZrB2 can enhance the ablation and mechanical properties of magnesium phosphate cement (MPC). The high thermal conductivity of ZrB2 additive and the evaporation of boron-containing oxides are crucial for reducing the surface temperature.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Shanliang Ma, Zengqi Zhang, Xiaoming Liu, Fanghui Han
Summary: The in-situ characterization of the rapid early reaction of magnesium potassium phosphate cement (MKPC) via common methods is difficult. This study utilized low field nuclear magnetic resonance (LF-NMR) for in-situ monitoring the reaction degree of MgO in MKPC. Compared with XRD-Rietveld, BSE image analysis, and TG analysis methods, LF-NMR proved to be a correct and effective method for the rapid and accurate characterization of the reaction kinetics of MKPC. The obtained insitu kinetic data contributed to the simulation of MKPC's porosity development and established a strong relationship between calculated porosity and compressive strength, which can be used for further performance prediction.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Jincheng Yu, Jueshi Qian, Huaxin Chen, Yabin Ou, Dongliang Kuang, Xingwen Jia, Heping Qiu
Summary: This study investigates the performance of low-cost magnesium phosphate cement (MPC) mortars prepared with calcined dolomite-bauxite-gypsum powders containing C4A3 S. It examines the setting times, fluidities, hydration temperature developments, compressive strength developments, and volume changes of these MPC mortars. The study also compares the differences in compressive strength, flexural strength, and bond strength development between MPC mortars with C4A3 S cured in air and water. Furthermore, it investigates the phase developments, microstructures, and pore diameter distribution of MPC mortars with ye'elemite.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Thermodynamics
Yuqi Zhou, Zengqi Zhang
Summary: This study investigates the effects of replacing cement with ultra-fine ground granulated blast-furnace slag (UFS) or silica fume (SF) on the durability of reactive powder concrete (RPC). The inclusion of SF or UFS was found to accelerate the early hydration of cement and increase the consumption of Ca(OH)2. RPC with the addition of steel fibre exhibited higher compressive strength than RPC without steel fibre, and UFS was proven to be the more economical admixture option compared to SF.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Fanghui Han, Hongbo Zhang, Shaochang Pu, Zengqi Zhang
Summary: The influence of BFFS on hydration depends on temperature and BFFS content, with higher temperatures promoting hydration while increasing BFFS content slowing it down and reducing the exothermic rate. The hydration process involves nucleation and crystal growth, followed by interactions and diffusion.
THERMOCHIMICA ACTA
(2021)
Review
Construction & Building Technology
Kuisheng Liu, Zengqi Zhang, Jianwei Sun
Summary: This paper summarized and reviewed the mechanism and macro-performance of alkali-activated metallurgical slag, including suggestions for developing better activated methods and alkali-activators to improve performance. It also highlighted the unpredictable performance caused by variations in chemical components of metallurgical slags from different regions, calling for further study.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Xiansheng Hao, Xiaoming Liu, Zengqi Zhang, Wei Zhang, Yang Lu, Yaguang Wang, Tongyuan Yang
Summary: This study found that the synergistic effect of steel slag (SS) and red mud (RM) can improve the mechanical properties of high-volume solid waste cementitious materials. It was also discovered that the alkali in RM and sulphate in desulfurized gypsum (DG) can stimulate the activity of SS. The introduction of 5% DG significantly increases the interaction between SS and RM, leading to improved hydration degree and microstructure densification.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Chemistry, Physical
Wei Zhang, Chao Wei, Xiaoming Liu, Zengqi Zhang
Summary: This study aims to enhance the long-term frost resistance of circulating fluidized bed fly ash (CFA)-based multisolid waste cementitious material (CSM) by preparing CSM2 using CFA, BFS, RM, and PS. The results show that CSM2 exhibits superior strength and mass stability after 25 freeze-thaw cycles, meeting the performance requirements of fly ash Portland cement 42.5#. The major hydration products include C-S-H gel, C/N-A-S-H gel, and ettringite. In addition, CSM2 has the densest interface, micromorphology, and pore structure, which contribute to the improvement of long-term frost resistance.
Article
Chemistry, Physical
Wei Zhang, Chao Wei, Xiaoming Liu, Zengqi Zhang
Summary: This study reveals that phosphorus slag (PS) admixtures can improve the performance of circulating fluidized bed fly ash-based multi-solid waste cementitious material (CWM) by studying their effect on its properties and hydration mechanism. The optimal conditions for CWM2 are identified, and the main hydration products are found to improve the compactness of the micromorphology. The study also shows that physical encapsulation and charge balance promote the consolidation of certain elements, meeting the drinking water requirements. This work provides a new idea for the application of PS as an admixture in CFA-based multi-solid waste cementitious material.
Review
Chemistry, Physical
Shanliang Ma, Zengqi Zhang, Xiaoming Liu
Summary: Aluminosilicate phosphate (ASP) geopolymers have received extensive attention due to their low-carbon synthesis process, high mechanical properties, strong heat resistance, and excellent dielectric properties. This paper summarizes the latest research progress of ASP geopolymers in terms of synthesis processes, performances, modifications, and application developments, and suggests possible future applications.
Article
Construction & Building Technology
Shanliang Ma, Zengqi Zhang, Xiaoming Liu, Yantian Li, Qingsen Zeng, Wei Zhang
Summary: This study proposes a new method of reusing red mud as a mineral admixture in magnesium potassium phosphate cement (MKPC), which improves its performance and reduces preparation cost. The addition of red mud increases the fluidity and prolongs the setting time of MKPC paste, and also enhances the microstructure of MKPC through physical filling effects and chemical effects.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Shanliang Ma, Zengqi Zhang, Xiaoming Liu, Fanghui Han
Summary: The in-situ characterization of the rapid early reaction of magnesium potassium phosphate cement (MKPC) via common methods is difficult. This study utilized low field nuclear magnetic resonance (LF-NMR) for in-situ monitoring the reaction degree of MgO in MKPC. Compared with XRD-Rietveld, BSE image analysis, and TG analysis methods, LF-NMR proved to be a correct and effective method for the rapid and accurate characterization of the reaction kinetics of MKPC. The obtained insitu kinetic data contributed to the simulation of MKPC's porosity development and established a strong relationship between calculated porosity and compressive strength, which can be used for further performance prediction.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Review
Construction & Building Technology
Jiarui Gu, Xiaoming Liu, Zengqi Zhang
Summary: The accumulation of industrial solid wastes has caused serious environmental pollution. Utilizing these wastes as road base materials is a feasible solution. This study reviews the possibility of using different industrial solid wastes for road base materials and compares their properties and compressive strength. It is found that selecting the proper type and proportion of industrial solid wastes can improve the performance of road base materials. Applying industrial solid wastes to roads not only solves the waste accumulation problem but also broadens the selection range of road base materials. Critical suggestions for the preparation of road base materials from industrial solid wastes are given.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Chao Wei, Yutong Yan, Zengqi Zhang, Xiaoming Liu, Pengfei Wu, Jiarui Gu, Fanghui Han, Qiang Ren
Summary: Utilizing solid waste materials such as red mud, circulating fluidized bed fly ash, and blast furnace slag, low cement clinker UHPC was prepared with reduced costs and improved performance. In low cement systems, a synergy among these solid waste materials was observed, which effectively enhanced the hydration degree and pore structure of UHPC.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Review
Green & Sustainable Science & Technology
Fanghui Han, Hongbo Zhang, Yuchen Li, Zengqi Zhang
Summary: This paper summarizes the research on FNS as supplementary cementitious materials, aggregates, and precursors, and comprehensively analyzes the sustainable utilization of FNS. The results suggest that BFS is suitable as SCMs, but it needs to be ground to 400-500 m^2/kg. EFS is suitable as aggregate. The research direction of further improving the recycling efficiency and cleaner production of FNS is given based on the results of this paper.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Xinyue Liu, Xiaoming Liu, Zengqi Zhang, Chao Wei, Qingsen Zeng, Yantian Li, Shanliang Ma
Summary: This study aimed to increase the pozzolanic activity of yellow phosphorus slag (YPS) through thermal activation. The results showed that YPS ash calcined at 800°C enhanced early strength, while YPS ash calcined at 100°C improved late strength. The pozzolanic activity of YPS ash was positively correlated with the dissolution concentration of (Si + Al) and compressive strength, and negatively associated with the polymerization degree. This paper demonstrates the possibility of large-scale utilization of YPS.
Review
Construction & Building Technology
Pengfei Wu, Xiaoming Liu, Zengqi Zhang, Chao Wei
Summary: Red mud, a harmful waste from alumina production, can improve the properties of resin composites and reduce resource usage and costs when incorporated. This paper provides a comprehensive review of the research status of using red mud in resin composites, discussing different treatment methods and preparation processes, as well as the theory of interface formation and bonding.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
