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2024 Vol. 0, No. 12
Published: 2024-12-10
1
Experimental study on effect of temperature on carbonization process of G-class oil well cement under CCUS environment
LONG Dan, et al
CCUS technology, as an important emerging technology for controlling greenhouse effects and achieving sustainable development of human society, has gradually received widespread attention from the international community. However, during the process of CO2 injection and storage, long-term contact between cement and CO2 will cause CO2 corrosion problem, resulting in the destruction of the structural integrity of the cement stone. In order to investigate the carbonation corrosion process of G-class oil well cement at different temperatures in a CO2-rich underground environment, this study analyzed it using microscopic tests such as XRD, TG/DTG, FTIR and SEM. The results indicate that a large amount of calcite and aragonite are formed after carbonization of cement stone at different temperatures, and calcite dominates. With the increases of carbonization temperature and age, both C-S-H gel and CH of cement paste participate in the carbonization reaction. The content of calcite and aragonite in the sample gradually increases, and the degree of carbonization deepens. With the increases of carbonization temperature and age, C-S-H gel and CH gradually transform into CaCO3 crystals, leading to a volume change. As the CaCO3 crystals gradually develop and grow, the cement stone matrix will expand internally, forming numerous cracks and pores, further damaging the matrix structure.
2024 Vol. 0 (12): 1- [
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4
Analysis on whole process project management of new construction project across existing aqueduct
LIU Xingfan
2024 Vol. 0 (12): 4- [
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63
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5
Study on influence of carbonization system on performance and carbon fixation of aerated concrete
ZHANG Bin, et al
The use of carbon dioxide curing can effectively reduce the carbon emissions of traditional autoclaved aerated concrete and permanently store carbon dioxide. This study used cement, steel slag, tailings and other raw materials, and studied the effect of carbonization system on the performance and carbon fixation of aerated concrete through carbon dioxide curing. The study focused on exploring the effects of carbonation time, carbonation pressure, and carbon dioxide concentration on the strength, drying shrinkage, thermal conductivity, and carbon fixation of aerated concrete. The results showed that carbonation within 2 hours had a significant impact on improving the strength and carbon fixation of aerated concrete and reducing its drying shrinkage. When the carbonation pressure was lower than 0.5 MPa, increasing the carbonation pressure was beneficial to improve the performance of aerated concrete, and a stepwise carbonization system has a promoting effect on improving the performance of aerated concrete. When the CO2 concentration was higher than 75%, the CO2 concentration had little effect on the performance and carbon fixation of aerated concrete.
2024 Vol. 0 (12): 5- [
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74
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10
Experimental study on pipeline conveying and feeding system for cooperative disposal of hazardous waste paste in cement kiln
GUO Guangming
2024 Vol. 0 (12): 10- [
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102
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17
Technology and practice of co-processing domestic waste and hazardous waste with cement kiln
WEI Baiyong
2024 Vol. 0 (12): 17- [
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93
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21
Application of step furnace in alternative fuel disposal
Hot!
QI Baoquan, et al
2024 Vol. 0 (12): 21- [
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179
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24
Analysis of application of alternative fuel projects in cement industry from perspective of economic benefits
Hot!
HUI Jiazhuang, et al
2024 Vol. 0 (12): 24- [
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108
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26
Application of oxygen-enriched combustion technology in 7 500 t/d rotary kiln
Hot!
ZHANG Liang
2024 Vol. 0 (12): 26- [
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143
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28
Energy saving and emission reduction technology practice of 4 800 t/d clinker production line
Hot!
ZHANG Yan, et al
2024 Vol. 0 (12): 28- [
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105
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33
Energy balance and precise utilization of grinding system
CHEN Xinggang, et al
2024 Vol. 0 (12): 33- [
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106
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37
Numerical simulation of wind load type coefficient of tower of preheater
DONG Tianshu, et al
As a wind-sensitive super-high-rise steel structure, the determination of the wind load factor for the kiln-tail tower of a cement plant is of critical importance in the design. The current “GB 50009—2012” only provides wind load coefficient values for closed tower structures, and the actual open tower structure does not take into account the influence of inter-story equipment, which leads to the use of conservative coefficients in structural design, increasing the amount of steel and structural weight, resulting in a waste of materials. For this reason, this paper carried out numerical simulation of kiln-tail tower under different wind angles through FLUENT software, and verified the accuracy of numerical simulation through the wind tunnel test of existing high-rise buildings, and then compared and analyzed the results of numerical simulation with the traditional specification design and PKPM calculation results. The results show that the numerical simulation can realistically simulate the wind field and accurately analyze the wind pressure characteristics of the kiln-tail pylon structure under real conditions. The wind load coefficients in the code design are conservative and can be reduced in the actual design. The body shape coefficient of the kiln tail tower is significantly affected by the distribution of the equipment between the layers and the height. According to the variation of the average width of the equipment, the whole kiln tail tower can be divided into three zones, and the variation of the body shape coefficient and the height are basically in a linear relationship in each sub-zone. Finally, based on the data fitting, a new value for the wind load coefficient of the kiln tail tower is proposed
2024 Vol. 0 (12): 37- [
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81
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44
Cement kiln AQC furnace renovation to solve wear problem
CHEN Huayun, et al
2024 Vol. 0 (12): 44- [
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84
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46
Influence and analysis of CO on SO2 determination of kiln tail pollution source
NI Xuguang, et al
2024 Vol. 0 (12): 46- [
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93
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49
BKJ stack door electrical control transformation
XU Puguo
2024 Vol. 0 (12): 49- [
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96
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51
Design and application of intelligent raw material batching system
YIN Zuowei, et al
2024 Vol. 0 (12): 51- [
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101
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54
Application of digital energy isolation in cement plant
CHEN Chao, et al.
2024 Vol. 0 (12): 54- [
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91
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59
Introduction to development of simple intelligent dispatching system for cement plant
LI Yutian, et al
2024 Vol. 0 (12): 59- [
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85
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62
Energy saving and efficient transformation of high temperature fan
YANG Zhongquan, et al.
2024 Vol. 0 (12): 62- [
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80
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64
Experimental study on permeability and compressive strength of pervious ceramisite concrete
ZHANG Jianpeng, et al
Utilizing an orthogonal experimental, the effects of net water-binder ratio, cement content, and the size of porous ceramic aggregate on the apparent density, continuous porosity, permeability, and compressive strength of pervious ceramisite concrete were studied. The results show a positive correlation between cement content and compressive strength. Cement content and the size of porous ceramic aggregate have a significant impact on the performance of pervious ceramisite concrete. The optimal combination is the net water-binder ratio of 0.30, cement content of 200 kg/m3, and the use of porous ceramic aggregate with a size range of 16~20 mm.
2024 Vol. 0 (12): 64- [
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138
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68
Effect of carbonated recycled composite powder on alkali slag materials
LI Qi, et al.
This study investigated the utilization of CO2-treated recycled concrete powder and recycled brick powder composite as a substitute for slag in the alkali-activated slag (AAS)mortar. The impacts of varying substitution levels of carbonated recycled composite powder (CCP)on the setting time, mechanical strength, and water absorption characteristics of AAS mortar were investigated. The results reveal that a 10% substitution rate of CCP yields the optimal compressive strength, surpassing that of untreated RBP by 19%. The main component of CCP is CaCO3, which has low solubility in alkaline environments andconsequently retards the setting time of AAS paste. Compared to RCP, the incorporation of CCP results in a further increase in the water absorption rate of AAS mortar. Furthermore, CCP has better ecological and economic benefits in AAS mortar.
2024 Vol. 0 (12): 68- [
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72
Study on properties of new hydraulic lime base coating mortar
SU Honglin, et al
2024 Vol. 0 (12): 72- [
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73
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77
Effect of nano-silica and graphene oxide on properties of phosphogypsum
ZHOU Xiang, et al
To achieve the high-quality development of building materials of phosphogypsum, nano-silica and graphene oxide(GO)were used as modifiers to improve the physical properties of phosphogypsum.It is showed that the working performance of phosphogypsum were influenced by nano-silica and GO. Setting time of phosphogypsum were extended by nano-silica, but on the contrary to GO. And the setting time shorter with the dosage of nano-silica and GO higher. Nano-silica can effectively improved the fluidity of phosphogypsum, while GO significantly reduced the fluidity of phosphogypsum. The higher the dosage of GO, the greater the loss of fluidity of phosphogypsum. Compared to nano-silica, the dry strength and water resistance of phosphogypsum were more effectively improved by GO. The dry strength of phosphogypsum was the best when the nano-silica and GO contents were 1.5% and 0.2% respectively. The water absorption of phosphogypsum decreased first and then increased with the increased of the nano-silica and GO, while the softening coefficient phosphogypsum changed conversely. Nano-silica(<3.0%) made a positive effect on the heat release rate of phosphogypsum in early hydration.The hydration heat of phosphogypsum can be significantly increased when the content of GO was 0.2%, but the hydration heat of phosphogypsum was not significantly affected by insufficient or too high content of GO
2024 Vol. 0 (12): 77- [
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81
Technical research and application of high fluid mortar mix ratio
LIU Zeyu, et al
2024 Vol. 0 (12): 81- [
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63
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84
Experimental study on compressive strength of separated fly ash and cement combined with double cementitious material system
ZHANG Guoxing, et al
Four kinds of ash with the same particle size and quality were separated from the primary ash with different particle size ranges by air flow separation technology, with the particle size from small to large as the separation ash Ⅰ, Ⅱ, Ⅲ and Ⅳ. 30% cement was replaced by separated ash Ⅰ, Ⅱ, Ⅲ and raw ash, and its compressive strength was compared with that of pure cement at 3 d, 7 d and 28 d. The results show that the 3d strength of raw ash and separated ash is lower than that of cement, while the 7d compressive strength of separated ash Ⅰ and separated ash Ⅱ is close to that of pure cement, and the 28d compressive strength is higher than that of pure cement. The particle size distribution of separated ash Ⅲ and raw ash is close to that of cement, and the 28d compressive strength is close to that of pure cement, but the 7d compressive strength is lower than that of pure cement. The separation ash Ⅱ, Ⅲ and its combination were used to replace 50% cement, and the complex ratio was 4:1, 3:2, 1:1, 2:3, 4:1, and the compressive strength was compared with that of pure cement for 3 d, 7 d and 28 d. The results showed that the strength of separation ash Ⅱ, Ⅲ and its compound at 3 d and 7 d was lower than that of cement. The 28 d strength of separation ash Ⅱ and Ⅲ is lower than that of pure cement, but the 28 d compressive strength of compound separation ash can exceed that of pure cement when the complex ratio of separation ash Ⅱ: sorted ash Ⅲ was 3:2 or 1:1, and the strength of compound separation ash with other compound ratios is close to that of pure cement. It can be seen that under the replacement of 50% cement, in addition to the fineness of fly ash, the combination of different particle sizes can further improve the28 d strength, which is due to the particle accumulation effect
2024 Vol. 0 (12): 84- [
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47
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91
Optimization of synthesis temperature and drip adding time of EPEG type polycarboxylic acid superplasticize
ZHAO Ting, et al
2024 Vol. 0 (12): 91- [
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71
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