Ren Juan Sun
Shandong University
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Featured researches published by Ren Juan Sun.
Applied Mechanics and Materials | 2013
Zhi Qin Zhao; Ren Juan Sun; Gong Feng Xin; Shan Shan Wei; Da Wei Huang
In this paper, the current situation of nanomaterials used in concrete were introduced, mechanism of nanomaterilas was reviewed. Recent application of nanomaterilas in special concrete such as air purified concrete, eco-concrete, high tenacity concrete were present.
Applied Mechanics and Materials | 2011
Li Zheng; Zhi Ge; Zhan Yong Yao; Ren Juan Sun; Jun Gui Dong
This paper studied the splitting tensile strength of concrete containing partial clay-brick-powder. Four variables, water to cementitious material ratio (W/CM), sand ratio, cement replacement ratio, and the average particle size of clay-brick-powder were determined to analyze the affected factors on the properties of the concrete. The orthogonal experimental design table L16 (45) was adopted to study the significance sequence of the variables. Total 17 type mixes, including one normal cement concrete as reference, were tested. Experiment results showed that recycled clay-brick-powder could be used as partial replacement of cement in concrete. The splitting tensile strength of samples with clay-brick-powder ranged from 2 to 4MPa.
Advanced Materials Research | 2011
Zhi Ge; Ren Juan Sun; Li Zheng
This paper studied the mechanical properties of concrete with cement partially replaced by recycled clay-brick-powder. Four variables (water/cement ratio, sand ratio, replacement level and average particle size of clay-brick-powder) were considered. Each variable had four levels. By using the orthogonal experimental design method, total 17 mixes, including one normal cement concrete as reference, were tested. Experiment results showed that recycled clay-brick-powder could be used as partial replacement of cement in concrete without reducing its properties. The strength was not significantly reduced with cement replacement level up to 25%. The elastic modulus was lower compared with cement concrete.
Applied Mechanics and Materials | 2013
Zhi Qin Zhao; Ren Juan Sun; Zi Qiang Feng; Shan Shan Wei; Da Wei Huang
Engineered Cementitious Composite (ECC) is a fiber reinforced cement based composite material, which systematically designed on the basis of micromechanics and engineered to achieve high ductility under tensile and shear load. The article introduced the development of ECC as advanced construction material, shown different mechanical properties of ECC, tensile strength, compressive strength, bending strength, shear strength. And in light of recent and future full-scale field applications of ECC were also summarized.
Applied Mechanics and Materials | 2014
Da Wei Huang; Ren Juan Sun; Shan Shan Wei; Yuanyuan Wang; Yi Zhang Hu; Zhi Ge
In this study the iron tailing was tested whether it can be used in the civil construction, Furthermore, specimen were made to test the mechanical properties of cement mortar with iron tailings substitute for part of cement. iron tailing sand has been ball mailed to specific fineness. The fineness of experimental iron tailing (sieve residue for the 200 mesh sieve) is 0.45%, 3%, 4.9%, 5.65%, 6.50%, 8.70%, 11.10% respectively.This paper show the influence law of different finesses of iron tailing powder on the Mechanical properties of cement mortar.
Applied Mechanics and Materials | 2014
Da Wei Huang; Ren Juan Sun; Shan Shan Wei; Yi Zhang Hu; Yuanyuan Wang; Zhi Ge
Adding different kinds of additives will change rheological properties of cement slurry, same to the concrete. The relationship between fluid shear stress (Γ) and the shear rate (Ds) called rheological properties. In this paper we studied the influence of different additives (Olyacryamide, polycarboxylate superplasticizer , nanoCaCO3) on the slurry rheological properties and the effects of polyacrylamide on cement mortar liquidity.
Applied Mechanics and Materials | 2013
Zhi Qin Zhao; Zhi Ge; Ren Juan Sun; Gong Feng Xin; Da Wei Huang
This paper presents an experimental study to evaluate the effects of fly ash and nanoCaCO3 on setting time of cement paste. The test group included the contents of fly ash was 30%, 40%, 50%, 60% and content of nanoCaCO3 was 2.5%, 5%, 10%, 20%. Results indicate that setting time was increased with the incorporation of fly ash, shortened with the incorporation of nanoCaCO3. The incorporation of 5% nanoCaCO3 by mass of cementitious materials reduced initial and final setting times by 60 and 70 min, respectively. In comparison to the referenced paste with 40% fly ash. The best fly ash content appear to be 40% when nanoCaCO3 was added.
Applied Mechanics and Materials | 2013
Ren Juan Sun; Zhi Qin Zhao; Da Wei Huang; Gong Feng Xin; Shan Shan Wei; Ge Zhi
The effect of fly ash and nanoCaCO3 on the viscosity of pastes was studied. The rheological value of cement paste was determined by the rotation rheometer NXS-11B. In the study, five different dosages (0%, 20%, 30%, 40%, and 50%) of fly ash and three levels of nanoCaCO3, 0.5%, 1%, and 2.5%, were considered. Viscosity of the pastes, made with fly ash and nanoCaCO3 at a constant water-to-binder ratio of 0.35, were measured and analyzed. The results indicate that the pastes with fly ash or/and nanoCaCO3 still fit the Bingham model. The addition of fly ash reduced viscosity, however, the addition of nanoCaCO3 increased viscosity. The effect of nanoCaCO3 is more significantly than fly ash on viscosity.
Applied Mechanics and Materials | 2013
Ren Juan Sun; Da Wei Huang; Mao Zheng Li; Shan Shan Wei; Zhi Qin Zhao; Zhi Ge
Tailings use is an important environment program and also society subject. Iron tailing is an environmental pollution resources, but it can be used to produce autoclaved aerated concrete (AAC). The chemical composition of iron tailing and the mineral compositions were analyzed by XRD test. The content of radioactive substance in iron tailing was also tested. The testing results show that the iron tailing meet the requirment for AAC production. Iron tailing was sieved to analyze the gradation and was milled by the ball grinding mill machine to proper fineness. Based on the given material mixing ratio, sample test showed that the density of AAC varies from 438 to 629 kg m-3 with different finenesses of iron tailing, and the height ratio of final height to casting height of AAC changes with the finenesses of iron tailing. The research findings have important lessons for the production of aerated concrete with tailing.
Advanced Materials Research | 2013
Ren Juan Sun; Zhi Ge; Wu Li; Hai Fang Zhou; Da Wei Huang
The efficient rapid repair for the distressed concrete pavement requires a rapid setting material that can be placed, cured, and opened to the traffic in short period. Normally, the time of the traffic open is determined by the concrete strength gain in the early hours. Meanwhile, the strength development and thermal and shrinkage properties of the concrete affect the structural and bonding performance of the repaired pavement. Type Ⅲ cement and Calcium Sulfoaluminate (CSA) cement are categorized as the rapid set cement (RSC) and are the most widely used as the cementitious material for the concrete structure rapid repair. The compressive strength of the RSC concrete cylinders with different mix proportions had been tested to obtain a strength gain guide for the rapid repair construction. Coefficient of the thermal expansion and shrinkage of the concrete were experimented. The results show that the RSC cement concretes are steady and can meet the requirement of the concrete pavement repair.