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RISS 인기검색어
- 검색키워드
- 저자 : Xiangchao ZENG (검색결과 4 건)
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An Overview of Study on Basic Magnesium Sulfate Cement and Concrete in China (2012-2019)
Xiangchao Zeng,Hongfa Yu,Chengyou Wu 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.10
In this review, investigations on the product of hydration, mechanical behavior, durability and application of basic magnesium sulfate cement (BMS) have been carried out in the past seven years in China. Structural characterization of 5·1·7 phase and hydrationproduct of BMS are introduced in the first part of this paper. The second part gives the research on the basic properties of BMS:strength, setting time, and microstructure of BMS. The third part show the durability of the cement: water resistance, chloridepenetration, ability of protecting reinforcing bars and carbonization. The last part is devoted to the production and application ofBMS, which indicates that basic magnesium sulfate cement has wide application potential in the construction industry.
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Xiangchao Zeng,Hongfa Yu 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.5
There is no systematic research on the basic physical and mechanical properties of the basic magnesium sulfate cement (BMS) concrete, which limited the application and development of BMS concrete. This paper offers a review of the new experimental results on structural performance of BMS concrete in recent five years. The flexural performance and shear behavior of BMS concrete beams, the compressive behavior of BMS columns as well as the seismic behavior of the column-beam joints are introduced. The structural components of BMS concrete show the higher value of the cracking moment and excellent flexural performance. The existing empirical equations for calculating the bearing capacity of beams and eccentric compressive columns are modified. The seismic behavior of the column-beam joints of BMS concrete is obviously influenced by the axial compression ratio of the joints. This paper would assist engineers and researchers in better understanding the performance of the new kind of structural concrete.
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Drying Shrinkage and Suppression Technology of HPC in Extremely Arid Area
Hongfa Yu,Xiangchao Zeng 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.1
Supplementary materials Such As Slag (SG), Fly Ash (FA) and Silica Fume (SF) are necessary for reducing the drying shrinkage of High-performance Concrete (HPC) in arid environments and extremely arid area. This paper investigates the drying shrinkage of HPC with the composites of 10% Silica Fume (SF) and 20% Fly Ash (FA) additions and another HPC incorporated with 10% SF?20% FA and 20% slag (SG), which were exposed to the conditions of 30% Relative Humidity (RH) and 50% RH. The inhibitive mechanism of Aluminate Expansion Agent (AEA) on the drying shrinkage of HPC reveals that the dry shrinkage can be inhibited by the expansion agent as long as the high density of concrete structure and the internal “surplus water” can be ensured. Furthermore, the additions of the composites of SF, FA and SG, super-plasticizer, high modulus fiber (PF) and AEA, can reduce the drying shrinkage and improve the moisture sensitivity of shrinkage of the concrete. The drying shrinkage rate of HPC in extremely harsh environment decreased to about 300 × 10−6 and no shrinkage cracks appeared on the surface of the HPC incorporated with SF, FA and SG. The perfect combination of high volume stability and high durability of HPC was realized.
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Performance of BMSC column with large eccentricity under natural exposure conditions
Haiyan Ma,Xiangchao ZENG,Hongfa Yu,Peng Yue,Haiwei Zhu,Chengyou Wu 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.76 No.4
As a new type of concrete material, basic magnesium sulfate cement concrete (BMSC) has the advantages, such as early strength, high strength, good toughness and crack resistance. However, it is unclear about the degradation of the mechanical properties of BMSC columns, which is exposed to the natural environment for several years. In order to apply this new concrete to practical engineering, six large-eccentricity compressive columns of BMSC were studied. The mechanical properties such as the crack propagation, failure morphology, lateral displacement and bearing capacity of BMSC column were studied. The results show that the degradation rate of ultimate load of BMSC column is from 6% to 7%. The degradation rate of the stiffness of the column is from 6% to 13%. With the increase of compressive strength of BMSC, the axial displacement and lateral displacement are gradually reduced. The calculation model of bearing capacity of the BMSC column under the large eccentric compression is proposed. This paper provides a reference for the application of BMSC columns in the civil engineering.
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