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RISS 인기검색어
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- 저자 : Changwang Yan (검색결과 3 건)
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Mechanical Properties and Microstructure of Sulfur Polymer Composite Containing Basalt Fibers
Bingang Wang,Ju Zhang,Changwang Yan,Jie Li,Pengju Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12
The paper aims to investigate the mechanical properties and microstructure of sulfur polymer composite (SPC) containing basalt fiber (BF). The compressive strength fc, splitting tensile strength ft, and flexural strength ff of SPC were tested at different BF contents of 0-3% and aspect ratios of 353 and 706. Meanwhile, the microstructure characteristics of SPC, i.e., the interfacial transition zone (ITZ) structure of SPC, bonding of BF with SPC, pore size distribution, and porosity, were analyzed. The results indicated that the inclusion of BF lowed the compressive strength of SPC; for SPC at a given BF content, the fc with 706 l/d was lower than that with 353 l/d. Meanwhile, the ft and ff of SPC with 353 l/d increased with BF content; for l/d of 706, the ft and ff increased with BF content before 2.5% then decreased with the increase in BF content; compared to 353 l/d, 706 l/d was more effective to improve the ft and ff of SPC. Additionally, an appropriate amount of BF was beneficial to improve the ITZ structure of SPC and bonding performance between BF and the matrix, and the porosity and pore size of SPC increased with BF content and l/d.
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Hydration characteristics of cementitious composites containing calcium silicate slag powder
Ru Bai,Ju Zhang,Changwang Yan,Shuguang Liu,Xiaoxiao Wang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.7
A significant portion of calcium silicate slag (CSS) waste is deposited in open landfills, leadingto various environmental concerns. CSS powder with high content of active β-C2S is apotential supplementary cementitious material. This study determined the isothermal hydrationheat flows of cementitious composites containing 0 − 40% CSS powder using an isothermalcalorimeter. The hydration kinetics and parameters were simulated and analyzed usingKrstulovic-Dabic model. Results indicated that the first exothermic peak of the cementitiouscomposite containing CSS powder shifted to the left and was significantly higher compared toPortland cement. The second exothermic peak also shifted to the left, but its value decreasedsignificantly. The cumulative hydration heat of the cementitious composite graduallydecreased with increasing of CSS powder content. The simulations from the kinetic modelshowed that the hydration rate of the entire process decreased with the increase of CSSpowder incorporation. These findings are expected to provide guidance for the use of CSSpowder in low-heat mortars or concrete.
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Delayed Strength Development of Composite Cementitious with Calcium Silicate Slag
Ru Bai,Ju Zhang,Changwang Yan,Shuguang Liu,Xiaoxiao Wang,Zhijie Yang,Hao Jing 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
Using pulverized calcium silicate slag (CSS) to replace part of Portland cement (PC) as composite cementitious material is the most energy-saving and clean treatment method. The main objective of this study was to investigate the delayed strength development of the CSS-PC composite cementitious. The compressive strength of the composite cementitious with 10% to 40% CSS was tested, the delayed strength was calculated, and the delayed age was analyzed. Results showed that the delayed strength and delayed age increased with the increase in the substitution rate of CSS, which was determined by the ratio of C2S and C3S. Moreover, a compressive strength prediction model of CSS–PC composite cementitious was established based on the “core-shell” hydration model. The calculated value was compared with the specification value of each country to analyze whether the compressive strength of CSS-PC composite cementitious meets the engineering requirements.
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