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2025 Vol. 0, No. 03
Published: 2025-03-10
1
Effect of discontinuous heating on properties of cement clinker
Hot!
WANG Zelin, et al.
In recent years, research on the use of solar thermal power generation for energy decarbonization has made significant progress. Research on solar-driven calcination of cement clinker has also been initiated. However, the calcination of cement clinker requires continuous heating, and solar energy supply is highly influenced by weather. Intermittent solar energy interruptions, such as those caused by cloud cover, can disrupt the heating process. To investigate the impact of short-term solar interruptions on the performance and calcination process of cement clinker, the study used a high-temperature muffle furnace to simulate intermittent heating, mimicking the effects of temporary solar energy shortages. The results indicate that the performance of clinker fired by short-term interruption of heating is better than that of uninterrupted clinker. In particular, the interruption temperature has the most obvious effect in the solid-phase reaction stage. Quantitative XRD analysis of the clinker confirms that intermittent heating followed by resumed calcination promotes the formation and development of C3S, with its content increasing by up to 25.13%. Additionally, the morphology and distribution of the C3S crystals were improved, hydration products were enhanced, and the 28-day compressive strength of the cement increased by up to 16.1%.
2025 Vol. 0 (03): 1- [
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9
Study on influence of vanadium-titanium slag on properties of Portland cement
ZHAO Di, et al.
In China, vanadium-titanium slag has a large number of emissions and high storage capacity. Therefore, there is an urgent demand for massive resource utilization of vanadium-titanium slag. In this study, the vanadium-titanium slag was mechanically activated, and the effect of the fineness (300~500 m2/kg) and dosage (30%~50%) on the properties of Portland cement was analyzed. Microscopic analysis was performed to explore the influencing mechanism of vanadium-titanium slag on the mechanical properties of cement. The purpose of this study is to provide a basis for the design and preparation of vanadium-titanium slag cement. The results exhibit that vanadium-titanium slag has no adverse impacts on the flowability, water demand, and stability of Portland cement. However, the setting time of cement will be extended with the dosage increasing. Furthermore, the mechanical properties of cement will be decrease with the increase of vanadium-titanium slag dosage, while the mechanical properties can be improved by controlling vanadium-titanium slag fineness. The vanadium-titanium slag cement presents relatively high mechanical properties at the dosage of 30%~50% and the specific surface area of 450~500 m2/kg of vanadium-titanium slag, the 28 d compressive strength of vanadium-titanium slag cement can reach 44.2~46.3 MPa. Increasing the fineness of vanadium-titanium slag can promote the pozzolanic activity of vanadium-titanium slag and enhance the heterogeneous nucleation of hydration products, which increases the hydration degree of cement and decreases the capillary pore volume of matrix, thus the mechanical properties of cement are enhanced.
2025 Vol. 0 (03): 9- [
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14
Experimental study on low-cost multi-component composite low density cement slurry system
DU Jing, et al
The application of particle size distribution theory plays a key role in improving the density, early strength development and long-term stability of cement paste. At the same time, the development of low-cost systems has important strategic significance for low-cost oil and gas extraction. Based on this, this article used fractal grading theory as a guide to develop a 1.50 g/cm3 composite low-density cement system based on five types of cementitious materials as substrates, and compared its performance with conventional hollow glass microsphere low-density cement systems. The results showed that the compressive strength of the multicomponent composite system cement stone cured at 60 ℃ for 1 d, 7 d, and 28 d increased by 47.74%, 19.18%, and 9.32% respectively compared with the conventional system, while its permeability decreased by 19.44%, 23.42%, and 24.91%. At 90 ℃, the 1 d, 7 d, and 28 d compressive strength increased by 0.9%, 53.58%, and 104.23% respectively, while the permeability decreased by 23.23%, 20.08%, and 37.17%. At the same time, the early instantaneous heat release rate of the system slurry was relatively high and significantly accelerated, the hydration induction period of the slurry was shortened, the heat release peak of the accelerated reaction was advanced, and the early accumulated hydration heat release was significantly increased. Under the premise of ensuring excellent engineering performance, the cost of this system is significantly reduced compared with conventional systems, and the slurry production rate is high, which can further reduce cementing costs and has good application prospects.
2025 Vol. 0 (03): 14- [
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20
Study on effect of particle size on activity of slag powder based cementitious material
Hot!
LIU Fangge, et al
The fineness, particle morphology and particle distribution of cementitious materials are important factors affecting the properties of cementitious materials. In this paper, slag powder with different specific surface area was used as the research object to study the activity of cementitious materials by laser particle size analysis. The results show that proper mixing of slag powder with different specific surface area can effectively improve the mechanical properties of cement slag powder mortar and optimize the activity of slag powder. The optimal composite ratio of slag powder and reference cement is SL1(300 kg/m2): SL2(460 kg/m2): SL3(570 kg/m2) :S = 1:3:1:5.
2025 Vol. 0 (03): 20- [
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24
Comprehensive evaluation of cement environmental impact and performance based on DOE technology
CHEN Shuyi, et al
Cement industry is facing severe pressure of the emission reduction in the context of the “dual carbon” target. Yet, the environmental impact caused by cement production is often positively related to the performance of cement. In order to explore the method of cement production with low environmental impact and high performance, Life Cycle Assessment (LCA) was used to quantify the environmental impact of the whole cement production process. Based on the environmental assessment results, DOE technology was introduced to analyze the influence of different process parameters combination on CO2 emission and compressive strength during the stage of clinker calcination. The results indicate that the CO2 emission is significantly influenced by the limestone ratio and the calcination temperature. And the limestone ratio, the raw meal fineness and the rotary kiln speed significantly affect the compressive strength of the clinker. In addition, utilizing the response optimization, the optimum combination of factors for minimizing CO2 emission and maximizing 28 d compressive strength was found to be 70% for the limestone ratio, 12% for the raw meal fineness, 1 300 ℃ for the calcination temperature and 6 r/min for the rotary kiln speed, which resulted in the CO2 emission of 817.187 kg/t.cl and 28 d compressive strength of 50.40 MPa. The research results can provide reference for the research on the comprehensive optimization for the environmental impact and performance of cement.
2025 Vol. 0 (03): 24- [
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31
Application of rags as alternative fuel in cement kiln
ZHOU Danhong
2025 Vol. 0 (03): 31- [
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17
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34
Practice of co-processing of high chromium solid hazardous waste in cement kiln
WEI Yiwen, et al.
2025 Vol. 0 (03): 34- [
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16
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36
Practice of new production of special cement in general cement production line
Hot!
LI Hechong, et al
2025 Vol. 0 (03): 36- [
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36
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39
Preheater system renovation of a 4 500 t/d production line
Hot!
KANG Jiliang, et al
2025 Vol. 0 (03): 39- [
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24
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42
Influence of fluorine ion content on clinker quality and reasonable control of fluorine ion
WANG Junlong, et al
2025 Vol. 0 (03): 42- [
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19
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46
Analysis on cause of tube explosion of superheater of a gas turbine waste heat boiler
ZHOU Yang, et al
2025 Vol. 0 (03): 46- [
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15
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50
Research on application of purified ash pneumatic conveying is carried out in comparison with fly ash
ZHU Zhichao, et al
In order to analyze difficulties of purified ash pneumatic conveying, the physical characteristics of purified ash, fly ash fine and coarse coal ash are compared. It is found that the particle size and density of purified ash is smaller than fine and coarse coal ash, which has poor mobility and is easy to adhere to the wall. Therefore, this paper improves the equipment from the perspective of enhancing the mobility of purified ash to improve the purified ash conveying capacity. The design selects the silo pump wall fluidisation improvement scheme, reduces the original fluidisation equipment in the silo pump to support the purified ash, and improves the degree of purified ash fluidisation. Improved silo pumps and pneumatic conveying logic are used in engineering practice, which is very good to complete the pneumatic conveying task, there is no material sticking situation occurs. The results show that the improvement of the silo pump wall fluidisation has a better ability to enhance the purified ash pneumatic conveying, and the optimization of the conveying logic of the purified ash pneumatic conveying system also makes the system process more suitable for the purified ash conveying characteristics.
2025 Vol. 0 (03): 50- [
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14
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55
Application and optimization of sifting dispenser in shale crusher
YE Shunbin
2025 Vol. 0 (03): 55- [
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12
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56
Ultra-low emission and ultra-low energy consumption transformation way for kiln tail dust collection system
FENG Changlin, et al
2025 Vol. 0 (03): 56- [
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10
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59
Common non-conformance and attention point’s summary of laboratory in operation of CNAS system
LIU Shan, et al
2025 Vol. 0 (03): 59- [
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11
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61
Research on net power supply improvement of cement kiln waste heat generation
CAI Dong
2025 Vol. 0 (03): 61- [
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16
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64
Application of interlocking device of direct current oil pump for cement waste heat power generation
JIA Jianhua, et al.
2025 Vol. 0 (03): 64- [
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15
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65
Failure analysis and reform of feeder reducer of raw meal mill
GAO Lei
2025 Vol. 0 (03): 65- [
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22
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67
Application of water turbine in cooling tower of cement plant
LIN Xi
2025 Vol. 0 (03): 67- [
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18
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69
Study on damage model of nano-silicon cement soil
ZHOU Zhongjing
2025 Vol. 0 (03): 69- [
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17
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72
Study on influence of recycled fine powder on properties of completely recycled blocks
YU Xiaojing, et al
2025 Vol. 0 (03): 72- [
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15
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79
Research progress on comprehensive utilization of ammonia-alkali white sludge
WANG Xin, et al.
2025 Vol. 0 (03): 79- [
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13
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83
Detection technology based on road and bridge concrete field construction
LI Yi
2025 Vol. 0 (03): 83- [
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13
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86
Application of mass concrete pouring construction technology in construction engineering
XU Heyu
2025 Vol. 0 (03): 86- [
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16
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89
Detection technology of cement and concrete based on non-metallic materials
HAN Mei
2025 Vol. 0 (03): 89- [
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13
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95
Research on application of new prefabricated concrete wall construction technology in residential buildings
LIANG Yafei, et al.
2025 Vol. 0 (03): 95- [
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12
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98
Application of high performance concrete in station platform canopy
ZHANG Yu
2025 Vol. 0 (03): 98- [
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10
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101
Construction technology of bubble light soil based on special subgrade section of expressway
ZHANG Dong
2025 Vol. 0 (03): 101- [
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12
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104
Study on influence of coarse aggregate quality on adaptability of concrete water-reducing agent and construction adjustment
AN Yu
2025 Vol. 0 (03): 104- [
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16
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