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2025 Vol. 0, No. 02
Published: 2025-02-10
1
Study on activation and mechanism of coal gangue assisted cementing material
ZHAO Shuai, et al.
In this study, coal gangue was calcined under various conditions (temperatures of 500 ℃, 600 ℃, 700 ℃; durations of 10 min, 30 min, 50 min) using microwave and conventional methods to enhance the activity of coal gangue and investigated its activation mechanism. The mineral phase transformations and structural changes of coal gangue at activation temperatures were analyzed through X-ray diffractometry (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and activity index experiments within the temperature range of 500 ℃ to 700 ℃. Cement paste was prepared by adding 30% activated coal gangue auxiliary cementitious material, and its mechanical properties were tested. Experimental findings showed that kaolinite in the coal gangue was gradually transformed into metakaolinite with increasing activation temperature. The 7 d compressive strength of gangue-cement paste activated at microwave 700 ℃ for 50 min as auxiliary cementitious material reached the highest, which increased by 23.63% compared with that of unactivated gangue-cement paste. This improvement can be attributed to amorphous SiO2 and Al2O3 present in activated coal gangue reacting with Ca(OH)2 produced during cement hydration process to form C-S-H, which enhances densification within cementitious materials thereby improving mechanical properties.
2025 Vol. 0 (02): 1- [
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6
Study on preparation of reclaimed cement from all waste concrete
Hot!
ZHANG Tinglei, et al
This study explored the design of raw material proportions without traditional raw materials, and its waste concrete in raw meal higher up to 100% by weight. Recycled cement was prepared by calcining reclaimed cement clinker from waste concrete. Experiments and analysis were employed to compare recycled cement with reference cement. The results show that recycled cement raw material that meets the requirement of cement clinker rate range can be prepared by using waste concrete completely. The XRD analysis shows that the main characteristic peaks of four minerals C3S, C2S, C3A and C4AF in the three prepared cement clinker are clear, the position and strength of the characteristic peaks are consistent with that of the reference cement, and the mineral formation of reclaimed cement clinker is normal. In reclaimed cement, except for a group of alkali content exceeds the upper limit of the standard value, other chemical indexes, physical and mechanical indexes meet the specification requirements. In the reclaimed cement, except for one group of clinker whose strength is low due to overburning, the strength of the other two groups both reach the requirements of 42.5 grade Portland cement. It is feasible to produce reclaimed cement by treating, batching, calcination and grinding waste concrete from different sources.
2025 Vol. 0 (02): 6- [
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11
Compressive strength and microstructure of geopolymer prepared from multi-component solid waste
ZHANG Guofang, et a
This study prepared geopolymers using construction waste powder, sludge incineration ash, calcium carbide residue, silica fume, ground granulated blast slag as precursor, and 5% sodium equivalent solutions of sodium hydroxide and sodium silicate were formulated as an alkaline activator with a modulus 1.5. The compressive strength and microstructure of geopolymers were analyzed through testing methods such as compressive strength, X-ray diffraction (XRD), scanning electron microscopyenergy-energy dispersive spectrometer analysis (SEM-EDS). The results show that calcium carbide residue and silica fume have an enhancing effect on the strength of geopolymers. When both are added at a dosage of 5%, the compressive strength of geopolymer paste can reach up to 65.83 MPa and 93.98 MPa at 3 days and 28 days, respectively. The microstructure analysis shows that the formation of calcium silicate aluminate hydrate (C-A-S-H) and sodium silicate aluminate hydrate (N-A-S-H) gels is the main reason for the formation and development of the compressive strength of solid waste based geopolymers.
2025 Vol. 0 (02): 11- [
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16
Research on difficulties and ideas of transformation of unorganized emission in cement industry ultra-low emission
Hot!
WEI Kai, et al
2025 Vol. 0 (02): 16- [
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36
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19
Study on effect of calcium fluoride sludge on burnability of raw meal and curing ratios of fluoride ion
WANG Junlong, et al
2025 Vol. 0 (02): 19- [
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24
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23
Numerical simulation and research on movement of domestic waste in bucket elevator
ZHANG Xuanchao, et al
n order to study the motion characteristics of alternative fuels such as domestic waste in the bucket elevator and explore whether the design of the conventional bucket elevator is suitable for the transportation of domestic waste, this paper takes the bucket elevator as an example, and uses the DEM discrete element analysis software to simulate the movement trajectory of domestic waste, and analyzes its movement trajectory, so as to put forward a theoretical basis for optimizing the structure of the bucket elevator suitable for domestic waste. The results show that when the elevator is in the stable feeding stage, the weight of the recycled material is basically linearly related to the time, which increases with the increase of the speed of the head wheel, and the filling rate of the hopper decreases with the increase of the speed. Appropriately reducing the speed of the head wheel can get a smaller discharge point, which is more conducive to hopper discharge and reduces returned material.
2025 Vol. 0 (02): 23- [
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26
Practice of blending RDF alternative fuel with CKK system
LI Limin, et al
2025 Vol. 0 (02): 26- [
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23
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28
Practical experience of carbon emission trading system in cement industry abroad
Hot!
WANG Xinchun, et al.
2025 Vol. 0 (02): 28- [
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22
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35
Introduction and application of intelligent on-line detection device for industrial ammonia water
ZHU Ruxia, et al
2025 Vol. 0 (02): 35- [
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30
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39
Mechanism and judgment basis of graded combustion
TANG Xinyu
2025 Vol. 0 (02): 39- [
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17
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42
Treatment measure for crust in smoke chamber of cement kiln system
LIU Zhongwei, et al.
2025 Vol. 0 (02): 42- [
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16
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45
Study on structural improvement of V-type powder separator for reducing resistance and increasing efficiency based on CFD
ZHANG Guicai, et al
V-type separator has complex structure, strong turbulence and turbulent flow in the internal flow field, and the sorting process is more complicated. In order to further study its internal flow field and sorting process, the structures of the existing V-type separator and the optimized V-type separator were compared and analyzed. Using the Fluent module of ANSYS Fluent software, the RSM model was used to analyze the velocity distribution, pressure distribution, streamline distribution, particle movement trajectory, the velocity and pressure distribution of the classifier plate, the inlet and outlet pressure difference and the sorting efficiency of the two structures. At the same time, the partially installed porous air homogenizer was studied, and the importance of feed uniformity of the V-type separator was also proposed, and the solution was given. The analysis results show that with the increase of inlet air volume, the separation efficiency becomes higher, and the equipment resistance is also increased. For particle size, the smaller the particle, the higher the separation efficiency. However, for fine particles, the increase in separation efficiency is not obvious as the increase of air volume. Through the structural analysis before and after renovation, the ideas for improving the existing V-type powder separator are provided.
2025 Vol. 0 (02): 45- [
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16
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50
Analysis of fluid-structure coupling strength of HRM vertical mill rotor
WANG Yu
2025 Vol. 0 (02): 50- [
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32
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53
Design and application of bulk cement long-distance transportation and trade measurement system
CHEN Xinghua, et al.
2025 Vol. 0 (02): 53- [
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17
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57
Optimization and promotion practice of the third-generation grate cooler
KANG Jiliang, et al
2025 Vol. 0 (02): 57- [
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16
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59
Optimization practice of combined open-circuit grinding system with 180-160 large roller presses
Hot!
WEI Huaijun, et al.
2025 Vol. 0 (02): 59- [
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40
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62
Application of transforming crawler mobile crusher into mobile roller screen in cement mine
HUANG Wuyin, et al
2025 Vol. 0 (02): 62- [
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17
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64
Some thoughts on GB175-2023 “Common Portland Cement”
DING Meirong, et al.
2025 Vol. 0 (02): 64- [
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30
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67
Reformation practice of pneumatic conveying pump
FU Jianjun
2025 Vol. 0 (02): 67- [
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21
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69
Transformation of raw material circulating fan
WANG Xiaojun
2025 Vol. 0 (02): 69- [
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22
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71
Experimental study on mechanical properties of soil-cement with nano-silica powder in Fuzhou Basin
ZHOU Zhongjing, et al
In order to find out the optimal addition ratios of nanometer silica fume, the paper discussed the influence of strength properties of the Cement-Stabilized Soil in different addition ratios’ nanometer materials. Experimental study of different conserved days’ was conducted on Cement-Stabilized Soil with different addition ratios’ nanometer silica fume. By unconfined compressive strength tests of the Cement-Stabilized Soil with the nanometer silica fume, the nanometer silica fume can raise the strength by one to three times than general Cement-Stabilized Soil in the scope of 1% to 2% of nanometer material addition ratio and 8.5% to 20% of cement’s addition ratio. Nanometer silica fume can raise Cement-Stabilized Soil’s early strength, the7 day strength can reach half of 90-day strength. And there exists optimal nanometer material addition ratios as cement addition ratios changing.
2025 Vol. 0 (02): 71- [
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24
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77
Effects of different activators on mechanical properties of multi-component solid waste cementing materials
WU Yongjun, et al.
In this paper, cement, slag, fly ash, and silica fume were used as raw materials to prepare multi-component solid waste cementitious materials in the form of alkali activation. Solid sodium silicate, solid NaOH, gypsum, aluminum sulfate and calcium hydroxide were used as activators to study the effect of activator dosage on the flexural and compressive strength of multi-component solid waste cementitious material mortar. The results show that when Na2O content of solid sodium silicate is 10% and modulus is 1.00, the performance of the cementitious material reaches the optimum, with a 28 day flexural strength of 6.5 MPa and compressive strength of 34.8 MPa. The optimal NaOH content is 10%, with a 28 day flexural strength of 4.0 MPa and a compressive strength of 18.0 MPa. The samples did not set and harden in 3 days at any amount of aluminum sulfate. The optimal dosage of calcium hydroxide is 8%, with a 28 day flexural strength of 6.1 MPa and a compressive strength of 28.3 MPa. The optimal gypsum content is 10%, with a 28 day flexural strength of 7.8 MPa and a compressive strength of 44.0 MPa, which meets the strength index of 42.5 Portland cement.
2025 Vol. 0 (02): 77- [
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80
Winter construction improvement scheme based on mass concrete box culvert structure
WANG Meng
2025 Vol. 0 (02): 80- [
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19
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83
Construction technology of rock slope based on half-dug and half-filled soil-cement roadbed
LV Jiuqi
2025 Vol. 0 (02): 83- [
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16
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86
Optimization scheme of anti-cracking construction technology of reinforced concrete tunnel lining
YE Ronghuan
2025 Vol. 0 (02): 86- [
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18
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89
Study on monitoring and control measures of hydration heat temperature of concrete of railway continuous beam bridge
LU Wei
2025 Vol. 0 (02): 89- [
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16
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92
Temperature control technology of mass concrete for raft foundation of high-rise building
HE Jiahuan, et al
2025 Vol. 0 (02): 92- [
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16
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95
Prevention method of crack in crushed stone base based on transverse cement stabilized
WANG Wei
2025 Vol. 0 (02): 95- [
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16
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99
Durability analysis of hydraulic dam structure based on high performance concrete
GAO Rui
2025 Vol. 0 (02): 99- [
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14
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102
Maintenance technology of highway cement base based on in situ cold regeneration technology
XIE Ke
2025 Vol. 0 (02): 102- [
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18
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