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2024 Vol. 0, No. 09
Published: 2024-09-10
1
New quality productivity enables cement to develop in high quality
Hot!
SUN Yue, et al
2024 Vol. 0 (09): 1- [
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4
Effect of different mixtures on properties of sulphoaluminate cement
MA Hui, et al
Due to differences of chemical activity and microscopic morphology, different mixtures have different effects on the subsequent hydration process of sulfoaluminate cement and thus affect the strength, chloride ion diffusion coefficient, expansion rate, hydration heat and microscopic morphology of cement. This article studies the changes in various properties of cement after adding limestone, slag powder, and fly ash to sulfoaluminate cement at mass fractions of 5%, 10%, 15%, and 20% respectively. The physical property tests show that the properties of the same mixture changed regularly with different dosages, in which the addition of 5% slag powder has the lowest effect on the strength, the addition of 5% or 10% limestone powder can effectively resist the chloride ion diffusion, and each dosage of fly ash can produce a good micro-expansion effect.
2024 Vol. 0 (09): 4- [
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54
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8
Preparation and application of early strength cement for energy saving and efficiency enhancement of assembled PC components
XIA Yanqing, et al
In order to achieve the required strength of the assembled PC component within a specific time frame without steam curing, this study investigates the impacts of mixture and calcium formate content on the physical and mechanical properties of cement based on early strength and early setting silicate clinker. Consequently, a kind of early strength cement is developed and successfully applied in the production of assembled PC components. The early hydration heat and hydration products of early strength cement and commercial P·O 42.5R cement are compared using isothermal calorimetry, X-ray diffraction (XRD), and synchronous thermal analysis (TG-DTG). The results show that when the grinding ratio of early strength cement is 80% clinker, 5% mixed gypsum, 7.5% limestone, 7.5% high titanium slag and 2‰ calcium formate, the hydration rate of early strength cement surpasses that of P·O42.5R cement during the initial stages, and it has higher abundance of hydration products, which enhances the compactness of the cement matrix and leads to a corresponding improvement in its strength. The early strength cement significantly enhances the 12-hour compressive strength of concrete during low temperature curing. When cured at temperature of 20 to 30 ℃, the concrete formulated with early strength cement can meet the demolding requirements after a 12-hour curing period, thereby enabling energy-efficient and productive production of prefabricated PC components.
2024 Vol. 0 (09): 8- [
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32
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14
Effect of co-processing of heavy metal barium slag by cement kiln on cement properties
GUI Linxiang, et al
2024 Vol. 0 (09): 14- [
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52
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17
Design and application of lime powder silo pulping system for cement wet desulfurization
2024 Vol. 0 (09): 17- [
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35
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20
Technical reform practice of rotary kiln system to improve quality and reduce consumption
WANG Yutao, et al
2024 Vol. 0 (09): 20- [
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35
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24
Technical reform practice of 5 000 t/d production line to save energy and reduce consumption
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DENG Qingping, et al
2024 Vol. 0 (09): 24- [
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54
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27
India PPC cement general situation and grinding technology status analysis
LIU Di, et al
2024 Vol. 0 (09): 27- [
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50
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31
Improvement and effect analysis of the fourth-generation grate cooler
Hot!
WU Dejin
2024 Vol. 0 (09): 31- [
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45
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34
Optimization and adjustment of the fourth-generation grate cooler
FENG Yongjie, et al.
2024 Vol. 0 (09): 34- [
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57
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36
Influencing factors and analysis of abnormal force of rotary kiln supporting wheel
WANG Wei, et al
2024 Vol. 0 (09): 36- [
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50
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40
Accident treatment and analysis of red kiln under mid-range wheel belt
LIU Hongfeng
2024 Vol. 0 (09): 40- [
Abstract
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42
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42
Technical reform practice of vertical mill nozzle ring
ZHANG Lihua, et al.
2024 Vol. 0 (09): 42- [
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50
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43
Reformation of cement combined grinding system production without dryer
Hot!
GAO Lei
2024 Vol. 0 (09): 43- [
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35
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45
Optimal design of cutting device for ash tube body of CAM mechanism
ZHANG Ying
2024 Vol. 0 (09): 45- [
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34
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48
Design and application of collectivized cement operation management platform data acquisition system
LUO Maolin, et al
2024 Vol. 0 (09): 48- [
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60
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51
Design and application of cement industry data management platform based on Docker container
MENG Xiangwei
2024 Vol. 0 (09): 51- [
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35
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54
Design and analysis of electrical energy saving in cement plant
YAO Hao
2024 Vol. 0 (09): 54- [
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45
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57
Reason analysis and treatment method of high operating temperature of main transmission DC motor in cement kiln
GUO Tingdong, et al.
2024 Vol. 0 (09): 57- [
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37
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59
Design and use of anti-oil leakage device of reducer
HU Linong
2024 Vol. 0 (09): 59- [
Abstract
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33
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60
Manufacture and use of laser positioning aid for kiln head burner
ZHANG Zhongguo
2024 Vol. 0 (09): 60- [
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39
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61
Design and application of special tool for removing pin of elastic sleeve of coupling
YAN Chaoran
2024 Vol. 0 (09): 61- [
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37
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62
Application practice of high efficiency audio clearance clogging device
WANG Weigang, et al.
2024 Vol. 0 (09): 62- [
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40
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63
Application of solvent-free anti-hanging wall material in pulverized coal silo
ZHUGE Ruidong, et al.
2024 Vol. 0 (09): 63- [
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39
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65
Research progress on self-repair technology of concrete cracks
CHEN Jing
2024 Vol. 0 (09): 65- [
Abstract
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43
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70
Development status and prospects of comprehensive utilization industry of construction waste in beijing
YU Xiaojing, et al
2024 Vol. 0 (09): 70- [
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35
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74
Application of C55 limestone rock mechanized sand self compacting prestressed concrete in prestressed box culvert engineering
DENG Xiangjun, et al.
2024 Vol. 0 (09): 74- [
Abstract
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38
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80
Experimental verification study on mixture and compressive strength of polymer pervious concrete
CHEN Xin, et al
2024 Vol. 0 (09): 80- [
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32
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85
Research on testing method of bubble properties of polymer admixtures
XU Zhengqian, et al
2024 Vol. 0 (09): 85- [
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53
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89
ontrol points of bored pile construction#br#
SUN Fang, et al.
2024 Vol. 0 (09): 89- [
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55
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93
Study on preparation and properties of steel slag based ternary concrete
LIANG Xiaoxiao, et al.
In order to promote the resource utilization of steel slag and solve the problem of practical application hindered by low activity of steel slag, this paper uses steel slag, metakaolin and silica fume as admixtures to prepare mortar specimens by an L9(33) orthogonal experimental design. The influences of admixture ratio, total admixture amount and steel slag fineness on the mechanical properties of mortar specimens are studied, and the optimal combination of horizontal factors is screened. Based on above, steel slag-based ternary concrete is prepared, and the optimal combination of horizontal factors is optimized and verified. The results show that the mortar specimens are most affected by the total admixture amount, and the optimal combination of horizontal factors is 1:2:2 (silica fume: steel slag: metakaolin) with the total admixture amount of 20% and the steel slag fineness of D90 is 147 μm. At the same time, compared with steel slag concrete with single admixture, the compressive strength of steel slag-based ternary concrete designed with optimal horizontal factors increases by 31.71% at 3 days, 54.21% at 7 days, and 9.84% at 28 days. Compared with standard cement concrete, the compressive strength increases by 4.68% at 3 days, 15.88% at 7 days, and 5.71% at 28 days, which meets the strength requirements for steel slag as an admixture in practical application to concrete.
2024 Vol. 0 (09): 93- [
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32
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98
Study on evaluation method of viscosity-reducing polycarboxylic acid products
XIAO Jianqi, et al.
Using typical viscosity-reducing polycarboxylic acid superplasticizers at home and abroad, the four-part workability test method of "dosage - flow rate - expansion - gas content" was innovatively adopted, combined with compressive strength test, and three typical concrete viscosity grades of C25~C30, C50~C55 and C60~C70 in application were simulated with water-binder ratios of 0.45, 0.35 and 0.29, respectively. The application effects of different viscosity-reducing polycarboxylic acid superplasticizers were systematically tested.
2024 Vol. 0 (09): 98- [
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29
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