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2025 Vol. 0, No. 01
Published: 2025-01-10
1
Study on influence of dormance-wake agent on hydration control of cement
WANG Chenglong, et al
This study investigates sucrose (SU) as a cement dormancy agent to delay the setting time by inhibiting the early hydration reaction of cement. Simultaneously, aluminum sulfate (AS) and calcium formate (CF) are introduced as activators to restore the normal hydration process of the cement. The research explores the effects and mechanisms of the dormancy-activation treatment on cement paste and hydration products. The experimental results demonstrate that the addition of 0.1% SU effectively suppresses the hydration of cement paste, while the incorporation of AS and CF counteracts the retarding effect of SU. The combined use of AS and CF further accelerates cement hydration, restoring its normal setting time. X-ray diffraction (XRD) and thermogravimetric analysis (TG-DTG) results reveal that the dormancy-activation treatment effectively promotes the formation of early hydration products, enhancing the compressive strength of mortar. When 2.0% AS and 1.5% CF are co-added, the compressive strength of the mortar reaches the optimum, with increases of 21.0% and 25.7% at 3 days and 7 days respectively. The experimental results provide relevant theoretical support and reference basis for the recycling and reuse of waste cement mortar.
2025 Vol. 0 (01): 1- [
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5
Research progress of thermal conductivity and thermal insulation cement for cementing geothermal Wells
ZHANG Chi, et al
Geothermal energy is a kind of renewable, durable and stable, green and environmentally friendly energy. The efficient exploitation and utilization of geothermal energy is an important way to promote China's energy transformation. The thermal conductivity and thermal insulation properties of geothermal well cement stone are the key factors to determine the efficiency of geothermal mining. In order to promote the progress of geothermal well cementing technology in China, the research status of high thermal conductivity materials, thermal insulation materials and their mechanisms in geothermal wells at home and abroad are reviewed. The fillers of high thermal conductivity cement in geothermal wells mainly include inorganic high thermal conductivity materials such as graphite, graphene, boron nitride and silicon carbide, and metal fillers such as copper powder, aluminum powder and iron ore powder. The fillers of geothermal well insulation cement mainly include pulverized coal ash, glass beads, rock wool, mineral wool and expanded perlite. The heat transfer efficiency of the material is reduced by creating more voids and pore structures within the material to fill with air. The characteristics of the evaluation method of cement stone thermal conductivity are summarized. Due to the characteristics of short test time, convenient sample preparation and suitable for the test of heterogeneous water-bearing materials, the transient method is more suitable for the thermal conductivity test method of geothermal well cementing cement. Improving the anti-recession, anti-corrosion and anti-permeability of cement stone in geothermal environment is an important research direction of high thermal conductivity cement stone in the future. The selection of cement foaming agent, the combination of organic thermal insulation materials and cement system, and the development of thermal insulation cement system with high strength, low density and strong thermal insulation ability are the main directions of future research.
2025 Vol. 0 (01): 5- [
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21
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9
Study on substitution of natural quartz sand by mechanical quartz sand for Chinese ISO standard sand
SUN Zhisheng, et al
China ISO standard sand is a legal reference material used for cement strength inspection. Standard sand is made of high purity non-renewable natural quartz sand. With the depletion of natural quartz sand resources in China, the production and supply of standard sand are seriously affected. Based on the feasibility study of replacing natural quartz sand with machine-made quartz sand, this paper innovatively adopts a new type of dry energy-saving vertical grinding and shaping equipment developed by ourselves to grind and shape machine-made quartz sand, and it is used to replace standard natural sand in the test. The results show that the single grade sand can replace the standard sand prepared by natural quartz sand, and has good performance characteristics
2025 Vol. 0 (01): 9- [
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13
Research on the Physical and Chemical Characteristics of Retired Wind Turbine Blades for Collaborative Disposal of Cement Kilns
MA Zhongcheng, et al.
2025 Vol. 0 (01): 13- [
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19
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18
Analysis and verification non-SCR technology to achieve cement kiln NOx ultra-low emission
Hot!
YUAN Bing, et al.
2025 Vol. 0 (01): 18- [
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28
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22
Policy Analysis and Case Study of Plant wide Environmental Control Platform Based on Cement Ultra low Emissions
YAN Yang, et al
2025 Vol. 0 (01): 22- [
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17
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27
Application of denitration technology with high temperature and low dust in cement kiln gas
LI Wenyong, et al.
2025 Vol. 0 (01): 27- [
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21
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30
Research on development cycle and development trend of cement industry based on industry life cycle theory
Hot!
CUI Liming
2025 Vol. 0 (01): 30- [
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21
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34
Experimental study on combustion characteristics of alternative fuels in calciner
Hot!
SHI Rui, et al.
2025 Vol. 0 (01): 34- [
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39
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40
Discussion on steel ball gradation of standard test mill in laboratory
LUO Hui, et al.
2025 Vol. 0 (01): 40- [
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48
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43
Optimization of C3 and C4 cyclone inlet structure
WANG Jun, et al
2025 Vol. 0 (01): 43- [
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23
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45
Selection and adjustment measures of desulfurizing gypsum addition point in double closed circuit system of roller press
ZHANG Quanlei, et al.
2025 Vol. 0 (01): 45- [
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19
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47
Application of raw material mineralizer in 5 000 t/d clinker production line
ZHUGE Ruidong, et al
2025 Vol. 0 (01): 47- [
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24
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50
Application practice of improving lignite in cement industry
GUO Guizhang, et al.
2025 Vol. 0 (01): 50- [
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18
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52
Practice of changing process transformation of pulverized coal preparation systems in cement kilns
JI Lan, et al.
2025 Vol. 0 (01): 52- [
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18
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54
Application of 3G-CK490 external circulation cement vertical grinding final grinding system
Hot!
XU Yue, et al.
2025 Vol. 0 (01): 54- [
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35
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57
Research and application of ultra-low emission technology of slag grinding bag dust collecto
YAN Guilin, et al
2025 Vol. 0 (01): 57- [
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19
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60
Research on leak diagnosis technology of bag filter
FAN Xiaoqian, et al.
Bag filter dust removal technology has been widely used in cement, steel, electric power and other industries, but finding leaky bag filter is a difficult for manufacturing enterprises. Three main features, baseline value, slip peak area and valley value, are acquired from a large number of realtime data collected by AC coupling dust monitor, which are used to digitally display the bag filter running status, and locate the leaking location of the bag filters. The baseline value calculated by the improved local outlier factor LOF (local outlier factor) algorithm can accurately track the process change and bag leaking status, and its correlation coefficient with the particulate CEMS data is 0.85. For the off-line bag filter, slip peak area and valley value are used to locate the leaking bag house, which is used to precise maintenance the bag filters and achieve the deep emission reduction.
2025 Vol. 0 (01): 60- [
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19
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65
Technical renovation of variable frequency constant pressure water supply in circulating water pump room of cement plant
GUO Chengjun
2025 Vol. 0 (01): 65- [
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27
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68
Research and application of intelligent control system for loading finished products of 10 million tons aggregate mine
WU Hao, et al
2025 Vol. 0 (01): 68- [
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22
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71
Research on standardization of technical parameters of isothermal conduction calorimetry test
GUO Junping, et al
2025 Vol. 0 (01): 71- [
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17
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75
Study on effect of ammonium chloride treated recycled micropowder on cement-based materials
XU Jian, et al.
Using recycled micropowder (RCP) as cement-based cementing material can effectively utilize construction waste. However, cement mortars containing RCP usually exhibit poor performance due to the low activity and high porosity of RCP. In order to solve this problem, ammonium chloride was used to improve RCP, which replaced 10% cement to prepare mortar. The effects of RCP substitution level modified by ammonium chloride on hydration properties, mechanical strength and pore structure of cement mortar was investigated. The experimental results show that the particle size of RCP soaked in ammonium chloride solution is smaller, which is conducive to the hydration of cement. Ammonium chloride reacts with calcium-based components such as C-S-H to generate active silica gel, which optimizes the pore structure of RCP mortar, thereby enhancing the compressive strength of RCP mortar. The compressive strength of RCP mortar of the optimal group is about 15.5% higher than that of untreated RCP mortar, which is close to that of pure cement mortar
2025 Vol. 0 (01): 75- [
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18
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79
Construction plan for a certain highway based on cement stabilized graded crushed stone base
DU Zhenyan
2025 Vol. 0 (01): 79- [
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15
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82
Construction Technology and Application of Reinforced Concrete Structure Buildings
ZHANG Qingtao
2025 Vol. 0 (01): 82- [
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20
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85
Construction plan for municipal roads based on modified cement concrete pavement
WANG Guibao, et al.
2025 Vol. 0 (01): 85- [
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20
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88
Construction Technology of Prestressed Concrete Rotating Continuous Beam Horizontal Rotation
WANG Miao
2025 Vol. 0 (01): 88- [
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14
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92
Research and Application of Anti Crack Concrete Construction Technology for Road and Bridge
LIU Hongmin.
2025 Vol. 0 (01): 92- [
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13
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95
Early temperature stress analysis of concrete roof slab in ultra long section open cut tunnel
LI Hui, et al
2025 Vol. 0 (01): 95- [
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13
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98
Construction and deformation monitoring of ultra-high balanced weight concrete retaining wall
PAN Jimin
2025 Vol. 0 (01): 98- [
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17
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101
Analysis of artificial sand and gravel aggregate crushing process and equipment selection
DENG Hua.
2025 Vol. 0 (01): 101- [
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15
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