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2025 Vol. 0, No. 06
Published: 2025-06-10
1
Research on influence of mineral admixtures on rheological behavior of cement mortar
LI Duanle, et al.
Studying the impact of typical mineral admixtures on the rheological behavior and reaction rate of cement mortar is of significant importance for regulating the early working performance. This paper investigates the effects of four commonly used mineral admixtures in cement-based materials (blast furnace slag, fly ash, steel slag, and limestone) on the rheological parameters (time-dependent torque, yield torque, and relative viscosity), shear failure modes, and reaction processes (hydration heat release) of fresh cement mortar. Additionally, the relationship between the influence of different admixtures on the rheological behavior and the reaction process is also explained. The findings indicate that a 10% dosage of mineral admixtures all strengthens the structural formation capacity of cement mortar, while a 30% dosage delays the structural formation rate of the fresh mortar. A high dosage (30%) of fly ash delays the occurrence time of shear slip in cement mortar, while steel slag shows the opposite effect. The addition of 30% fly ash and blast furnace slag reduces the yield torque to varying degrees (the case of limestone is similar to that of fly ash), while steel slag significantly enhances the yield torque and relative viscosity. The hydration heat release results reveal that the variations in the rheological behavior of cement mortar containing mineral admixtures are respectively related to the nucleation effect of fly ash and limestone, as well as the participation of blast furnace slag and steel slag in the cement hydration process, which changes the early-age reaction characteristics of cement mortar
2025 Vol. 0 (06): 1- [
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8
Influence of electrolytic manganese slag on compressive strength performance and hydration process of supersulfurized cement
JIN Qing, et al.
Due to the presence of phosphates and ammonium nitrogen compounds in manganese slag, its application lead to delayed hydration of the paste and the formation of voids in ordinary Portland cement, affecting the strength properties of the cement paste. This study uses the sulfates in electrolytic manganese slag as an activator to prepare supersulfated cement, and removes the ammonium nitrogen compounds through a drying process to explore the effect of the ammonium nitrogen compounds on the hydration reaction of the system. The results showed that when the amount of untreated manganese slag replaced in supersulfated cement was less than 4%, the compressive strength of the supersulfated cement increased with the increase in dosage. However, when the dosage exceeded 4%, the compressive strength deteriorated. After removing ammonium nitrogen through drying, the compressive strength of the manganese slag showed improvement at a replacement level less than 6%. The compressive strength of the supersulfated cement with 6% pretreatment manganese slag was 10.1 MPa higher than that of the blank sample at 3 days, and 8.3 MPa higher at 28 days
2025 Vol. 0 (06): 8- [
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13
Influence of phosphogypsum on properties and setting and hardening process of micro-expansion road base cement
DUAN Wenbo, et al
Phosphogypsum is an excellent industrial by-product to produce road base cement with slow coagulation and small expansion. In this paper, the regulation and mechanism of phosphogypsum on the setting and hardening process of micro-expansion road base cement were studied. By adjusting the content of phosphogypsum (5%~17%), combining with XRD, SEM and property tests, the effects of phosphogypsum on the setting time, strength, expansion property, hydration product composition and microstructure of cement in the early stage of hydration were revealed. The results showed that the setting time of the road base cement increased significantly with the increase of phosphogypsum content, and the initial and final setting time increased linearly, which was mainly due to the reaction of soluble impurities in phosphogypsum with cement components to form insoluble salt, which delayed the cement hydration process. The compressive strength of mortar increased first and then decreased with the increase of phosphogypsum content. The addition of phosphogypsum significantly promoted the formation of ettringite, which ensured the sustainable development of micro-expansion of the road base cement. At high phosphogypsum content, ettringite crystal nucleation was accelerated in the early stage of hydration, and the amount of ettringite generation was obviously increased, but the rapid andmassive generation of ettringite led to the decline of the early mechanical properties of cement.
2025 Vol. 0 (06): 13- [
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18
Application of waste textile as alternative fuel in cement production line
Hot!
CHAI Xiaodong, et al
2025 Vol. 0 (06): 18- [
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21
Tracking research of CCUS test projects in cement industry abroad
GAO Xiangyu, et al
2025 Vol. 0 (06): 21- [
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25
Research and application of green hydrogen energy carbon reduction industrial technology for ammonia hydrogen supply to replace coal in cement production
Hot!
ZHAO Huanyi, et al.
2025 Vol. 0 (06): 25- [
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28
Dynamic analysis and industrial test of oxygen-rich sintering of cement clinker in plateau area
Hot!
DENG Guoliang, et al.
2025 Vol. 0 (06): 28- [
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31
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34
Research and application of coal-saving and combustion-assisting agents for new dry-process cement kilns
LIU Jianjun, et al.
2025 Vol. 0 (06): 34- [
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37
Influence of different fineness of raw materials on clinker energy consumption and practice of batching optimization
WANG Xiaoliang, et al
2025 Vol. 0 (06): 37- [
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39
Application of Guinea Bayer red mud in production of cement clinker
MA Laiyun, et al.
2025 Vol. 0 (06): 39- [
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42
Exploration test of high sulfur limestone in cement limestone mine and application of zonal stratified mining technology
ZHOU Jianbo, et al.
2025 Vol. 0 (06): 42- [
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17
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46
Research on energy efficiency prediction analysis method and application for combined grinding system
Hot!
ZHANG Linfei
Combined grinding system has been widely used in cement production due to its high efficiency and energy saving characteristics. Accurately prediction and optimization the energy efficiency of the system is the focus of improving production efficiency and reducing energy consumption, and it is also a hot topic and difficulty in current research. Based on the grinding power area theory, an energy efficiency prediction analysis method was proposed in this paper, and a production capacity prediction and statistical model of the combined grinding system with the finished product of the roller press system as the connection point was established. Moreover, an accurate and reliable energy efficiency prediction and correction model of the combined grinding system based on the statistical model was constructed through the modification of the brittle and grill ability tests of the materials. The modified model can be used as an intelligent control model algorithm for production, which is an important tool for optimizing production process, reducing production cost and improving energy efficiency.
2025 Vol. 0 (06): 46- [
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51
Application practice of expert intelligent control system of rotary kiln
WANG Yahao, et al.
2025 Vol. 0 (06): 51- [
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22
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54
Application and optimization of low-pressure carbon dioxide fire extinguishing system in coal mill
LIU Jun
2025 Vol. 0 (06): 54- [
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24
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57
Comparison of accuracy of different hydration heat testing methods and analysis of their influencing factors
GUO Junping, et al.
2025 Vol. 0 (06): 57- [
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61
Rapid detection of activity index of slag powder based on 55 ℃ wet heat curing
JIA Longxing, et al.
2025 Vol. 0 (06): 61- [
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64
Analysis and improvement of fracture of lower rocker arm of vertical mill
HAN Youang
2025 Vol. 0 (06): 64- [
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24
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68
Research on influence of high-quality limestone dry-process machine-made sand on workability of concrete
GU Binhua
2025 Vol. 0 (06): 68- [
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21
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73
Composition design of calcium carbide slag-based cementitious materials and their application in semi-rigid base layers
CHEN Yongxiang, et al.
2025 Vol. 0 (06): 73- [
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18
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76
Experimental study on chloride ion penetration resistance of high-performance concrete with mineral admixtures
LI Shengwen, et al
This article designed five series of high-performance concrete specimens, including single fly ash, single mineral powder, single silica fume, double fly ash and mineral powder, double fly ash and silica fume. By conducting experiments on the resistance to chloride ion penetration using the electric flux method at different curing ages, the effects of various mineral admixtures with different dosages on the resistance to chloride ion penetration of high-performance concrete were studied and compared with ordinary concrete. The results showed that the single addition of 16% mineral powder had the best improvement effect on the electrical flux of concrete by comparing the improvement effect of various mineral admixtures with different dosages on the electrical flux of concrete, and its resistance to chloride ion penetration was the best. The high-performance concrete mixed with fly ash and mineral powder had the worst resistance to chloride ion penetration. The variation law of the anti chloride ion permeation diffusion coefficient was consistent with the test results of the electric flux method, indicating that the electric flux method was more convenient and efficient for evaluating the durability of concrete structures.
2025 Vol. 0 (06): 76- [
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79
Research on surface modification and anti-carbonization of recycled coarse aggregates from engineering waste soil
LI Jianxin, et al
In order to improve the anti-carbonization ability of reclaimed coarse aggregate, high anti-carbonization coarse aggregate was obtained by surface modification technology, and it was used to prepare C40 concrete. The results indicated that the strength of the regenerated aggregate was 3.53 MPa, and the strength of the modified regenerated aggregate by water glass was 5.48 MPa, which increased by 55%. The modified aggregate was carbonized for 12 h and 24 h, the strength was increased to 5.57 MPa and 5.93 MPa, which increased by 1.6% and 8.2%, respectively. After carbonization for 36 h, 48 h and 60 h, the strength was maintained at 101.2%, 85.0% and 74.6% of the strength without carbonization. The C40 concrete prepared with recycled aggregate had a compressive strength of 41.1 MPa at 28 days, which became 34.8 MPa after 24 hours of carbonization. The strength after modification was 42.2 MPa, which became 45.2 MPa after 24 hours of carbonization, which meets the performance requirements of C40 concrete. This research has existing application value and theoretical significance, and is expected to be applied in large-scale engineering.
2025 Vol. 0 (06): 79- [
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85
Application of fair-faced concrete in building construction
SHENG Kun, et al
2025 Vol. 0 (06): 85- [
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88
Research on application of high-performance concrete in seismic structures
WANG Yongqiang, et al
2025 Vol. 0 (06): 88- [
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91
Comparative analysis and application of various test methods in integrity detection of bridge foundation piles
CAO Yue
2025 Vol. 0 (06): 91- [
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95
Durability design and optimization of concrete structures for highway bridges
XU Yao, et al.
2025 Vol. 0 (06): 95- [
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98
Stability calculation and analysis of subsidence coefficient of extra-large cross-section land caissons
SUN Gang
2025 Vol. 0 (06): 98- [
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101
Construction technology of cast-in-place concrete hollow floor slabs under concept of green buildings
LOU Fangli
2025 Vol. 0 (06): 101- [
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18
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104
Research on application of construction technology for prefabricated concrete composite floor slabs
WANG Ruohan
2025 Vol. 0 (06): 104- [
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26
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107
Analysis of strength characteristics of recycled aggregate concrete and its influencing factors
CHU Qisheng, et al.
2025 Vol. 0 (06): 107- [
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110
Research on rapid pouring construction technology of high-performance concrete in building engineering
WANG Lina
2025 Vol. 0 (06): 110- [
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113
Research on winter construction technology of concrete in severely cold regions
XIA Qing
2025 Vol. 0 (06): 113- [
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22
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116
Research on performance of foamed concrete under different curing humidity conditions
KONG Xueyuan
2025 Vol. 0 (06): 116- [
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