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2024 Vol. 0, No. 11
Published: 2024-11-10
1
Effect of large amounts of phosphogypsum on properties of autoclaved aerated concrete
Hot!
CHEN Yongbo, et al
In order to boost the utilization of phosphogypsum (PG), the feasibility of using PG as a raw material for autoclaved aerated concrete (AAC) was investigated in this paper. The influence of different PG dosages on the compressive strength, foaming performance, pore structure and hydration products of AAC was tested. The results show that the addition of PG can significantly increase the compressive strength and refine the pore structure of AAC. With the increase in PG dosage, the morphology of tobermorite changed from narrow grass-like tobermorite to leaf-like tobermorite. At a PG dosage of 54%, the compressive strength and bulk density of AAC are 4.9 MPa and 622 kg/m3, respectively, which conform to the Chinese national standard (GB/T 11968-2020) for compressive strength (A3.5) and bulk density (B06).
2024 Vol. 0 (11): 1- [
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8
Microstructure characterization of interfacial transition zone between recycled aggregate and cellulose nanofiber modified cement paste
DENG Fangqian, et al
Recycled concrete formed by crushing waste concrete in construction waste as aggregate is an environmentally friendly and sustainable material, which is of great significance for reducing resource consumption and environmental pollution. However, the aggregate surface of recycled concrete has more cracks and defects than that of natural aggregate, resulting in that the interfacial transition zone of recycled aggregate interface is the weak link of recycled concrete. In order to modify the interface between the recycled aggregate and the matrix, a method of incorporating cellulose nanofibers into the matrix was proposed from the perspective of sustainability. The effect of cellulose nanofiber content on the interfacial microstructure around the recycled aggregate was investigated by means of thermogravimetric analysis, scanning electron microscopy and energy spectrum analysis. The results show that the microstructures at the old interfaces of recycled concrete are found to be loose with many holes, and the hydration degree of cement, the density of microstructure and the distribution uniformity of element content at the new interfacial transition zones are improved after adding an appropriate amount of cellulose nanofibers. An appropriate amount of cellulose nanofibers plays a positive role in the uniform distribution and full reaction of water molecules among cement particles in the curing stage, and the cellulose nanofibers can form a relatively dense network structure with the cement hydration products and then enhance the tightness between the micro-phases.
2024 Vol. 0 (11): 8- [
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14
Effect of co-processing of organic contaminated soil by cement kiln on clinker production
HU Chuanliang
2024 Vol. 0 (11): 14- [
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68
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17
Energy consumption calculation of co-processing cement kiln system and the choice of domestic waste incinerator
Hot!
ZHOU Xiaodong, et al.
2024 Vol. 0 (11): 17- [
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91
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20
Temperature protection of desulfurization tower system in cement wet desulfurization process
WANG Daobin, et al.
2024 Vol. 0 (11): 20- [
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73
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22
Research on decision making of process technology application in SCR project
Hot!
HU Yunsong, et al.
2024 Vol. 0 (11): 22- [
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100
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25
Production practice of medium heat Portland cement clinker with high silicon content
TU Shunzu, et al
2024 Vol. 0 (11): 25- [
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112
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28
Experience on reducing clinker standard coal consumption in high altitude area through raw material batching optimization and other measures
DUAN Bijun, et al.
2024 Vol. 0 (11): 28- [
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77
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31
Application test of industrial silica fume in cement production batching
FANG Renyu, et al.
2024 Vol. 0 (11): 31- [
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88
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35
Application of high sulfur and high calcium fly ash in cement production
GUO Yanqiu, et al.
2024 Vol. 0 (11): 35- [
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72
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38
Effect of phosphogypsum and natural gypsum as retarding agents on cement properties
WANG Yan, et al.
2024 Vol. 0 (11): 38- [
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72
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41
Ablative solution for kiln shell at hot end
HU Linong
2024 Vol. 0 (11): 41- [
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78
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42
Influence of limestone quality change on clinker quality and improvement measures
XIE Zhenzhong, et al.
2024 Vol. 0 (11): 42- [
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106
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45
External circulation cement vertical mill final grinding technology and industrial application
Hot!
CAO Changsheng, et al
2024 Vol. 0 (11): 45- [
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129
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51
Application of PDCA cycle control method in product quality management of cement enterprise
ZHANG Tao, et al
2024 Vol. 0 (11): 51- [
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66
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56
Cause analysis of bearing damage of LM48.4 raw material vertical grinding roller rocker seat and preventive measures
CHEN Jiaxiang, et al.
2024 Vol. 0 (11): 56- [
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86
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58
Influence of limestone particle size change on raw mill and improvement measures
ZHU Yingxin, et al.
2024 Vol. 0 (11): 58- [
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84
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59
Analysis and solution of vibration of cement rotary kiln
SHE Xiangzhong, et al.
2024 Vol. 0 (11): 59- [
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87
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61
Analysis and treatment of trip accident of turbo-generator
CAI Dong
2024 Vol. 0 (11): 61- [
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88
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63
Intelligent system of yard based on digital twin
ZHANG Feng, et al
2024 Vol. 0 (11): 63- [
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141
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66
Research on pressure difference prediction of vertical grinding mill based on LSTM-AMSgrad
LONG Lei
2024 Vol. 0 (11): 66- [
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86
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69
Dredging technology improvement of chute of ATOX50 roller grinding mill
TIAN Haiyang, et al
2024 Vol. 0 (11): 69- [
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65
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71
Reasons analysis and improvement for deviation of return powder chain conveyor in stone powder production
ZHANG Quanlei, et al
2024 Vol. 0 (11): 71- [
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58
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73
Practice of transformation of steady flow bin spreading tray
ZHANG Hong, et al
2024 Vol. 0 (11): 73- [
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79
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75
Repair of rotary kiln without stopping after support wheel is moving
QIN Pengzhi
2024 Vol. 0 (11): 75- [
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93
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76
Discussion on strategy of building solid waste reuse industry
YU Xiaojing, et al.
2024 Vol. 0 (11): 76- [
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74
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80
Experimental study on new solid waste base cementing material for tailings backfill
LI Wei, et al.
This article uses industrial solid waste fluoride gypsum and slag powder as the main raw materials to prepare a new type of solid waste-based cementitious materials, and explores the influence of different amounts of fluoride gypsum and slag powder on the mechanical properties of the new solid waste-based cementitious materials. Furthermore, based on this, the influence of different concentrations of tailings slurry and different proportions of lime-sand ratio on the performance of tailings cementitious materials using new solid waste-based cementitious materials was studied. Under the same conditions, as the concentration of tailings slurry increases, the compressive strength of the tailings cementitious bodies at all curing ages gradually rises. The ash-to-sand ratio emerges as the most significant factor influencing the compressive strength of tailings cementitious bodies, with a higher ratio correlating to greater compressive strength. Research indicates that the optimal composition for the new solid waste-based cementitious materials comprises 15% fluorogypsum, 75% slag powder, 10% cement, and 0.6% composite activator. It is advisable to adopt an ash-to-sand ratio of 1:8 and utilize a 70% concentration of tailings slurry to solidify tailings for mine backfilling. This approach effectively consumes industrial solid waste and tailings sand, lowers the cost of mine backfilling while fulfilling its performance requirements, and offers guidance for the comprehensive utilization of tailings backfilling solid waste resources
2024 Vol. 0 (11): 80- [
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85
Research progress and trend of high-performance concrete in China: Knowledge graph analysis based on CiteSpace
Shengkun, et al
High-performance concrete is a kind of concrete with high strength, high durability, high fluidity and high workability. With the rapid development of the construction industry, the demand for high-performance concrete is increasing, and the related research has become a hot topic in the academic community at home and abroad. Based on the software of CiteSpace, this paper researches on literature about high-performance concrete in China National Knowledge Infrastructure from 1992 to 2024 to conduct a visual analysis of the research progress and hotspot trend of high-performance concrete in China. The results of this study point out the direction of the research on high-performance concrete in China and provide a useful reference for research on related engineering technology in the future.
2024 Vol. 0 (11): 85- [
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70
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91
Review of chloride ion detection methods in concrete and application prospect of group detection
LIU Xinxin, et al.
Chloride ion content is an important indicator for evaluating the quality of concrete, and it is crucial to choose an efficient and accurate detection method. This paper summarizes the current research results, systematically introduces the main methods and application status of chloride ion detection in concrete, and discusses group testing and the feasibility of its application in concrete chloride ion detection. Finally, based on existing academic achievements, prospects for the future development of chloride ion detection technology are proposed.
2024 Vol. 0 (11): 91- [
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95
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96
Effect of desulphurization wastewater of different water quality on strength of fly ash-based products
WANG Mingsheng, et al.
This study used fly ash, cement and three types of desulfurization wastewater with different water qualities from coal-fired power plants, and the wastewater includes the raw water produced by the desulfurization tower, the effluent of the raw water after three-box treatment and the high-salt water from evaporation of the effluent compared with the deionized water, which were used in the preparation of fly ash-based products (for example, fly ash brick). Under the water-binder ratio of desulfurization wastewater and fly ash-cement composite powder of 0.28 condition, two fly ash-cement ratios of 7:3 and 9:1were used to prepare samples, which were cured for 28 days. The influences of cement content and different water quality on its compressive strength and flexural strength were studied. The results show that the compressive strength and flexural strength of the samples with fly ash-cement ratio of 7:3 are higher than 9:1, and the strengths of the samples using high salt water are the lowest, which is consistent with the expectation. In the aspect of flexural strength, the sample using raw water of two different fly ash-cement ratios is the highest, which has no obvious difference with the deionized water, and is higher than the effluent, and far higher than the high salt water. In the aspect of compressive strength for the fly ash-cement ratio of 7:3, the sample using effluent is the highest, and it is higher than raw water, which has no obvious difference with deionized water. At the fly ash-cement ratio of 9:1, the strength of fly ash-based products with raw water is the highest, and it is higher than the effluent, the effluent is higher than the deionized water. According to the strength grade requirements of the JC239—2001, fly ash-based products were prepared by using fly ash and desulfurization wastewater with different water quality as raw materials and appropriate cement dosage can meet the strength requirement of MU10 and achieve the goal of using waste (fly ash) to treat waste (desulfurization wastewater).
2024 Vol. 0 (11): 96- [
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