State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials

Mianyang, China

State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials

Mianyang, China

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Laibao L.,Nanjing Southeast University | Laibao L.,State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials | Yunsheng Z.,Nanjing Southeast University | Wenhua Z.,Nanjing Forestry University | And 3 more authors.
Construction and Building Materials | Year: 2013

Basalt powder is a by-product of basalt stone crushing plant. It is a big problem to propose utilization of these by-products from the aspects of disposal, environmental pollution and health hazards. In this paper, basalt is attempted to manufacture concrete as a new mineral admixture. Firstly, the chemical compositions and the pozzolan activity of the basalt were measured. Secondly, the cementitious paste with basalt powder was prepared and the normal consistency, setting time and the compressive strength were tested. Finally, the isothermal calorimetric measurement, X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) test were conducted to investigate the hydration process and microstructure formation of the basalt blended paste. The results show that the basalt has obvious potential pozzolan activities and can be used as a new mineral admixture. The basalt has retardation effect on the setting and hydration heat evolution process of cement. Besides, early age compressive strength development of the basalt blended paste was normally less than the pure cement paste, but the strength are close at later ages. © 2013 Published by Elsevier Ltd.


Liu Z.,Nanjing Southeast University | Zhang Y.,Nanjing Southeast University | Liu L.,Nanjing Southeast University | Liu L.,State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials | Jiang Q.,Nanjing Southeast University
Construction and Building Materials | Year: 2013

With a combination of effective medium and percolation theory, an analytical model was proposed to acquire the relative resistivity of cement paste and C-S-H. The overall electrical resistivity and volume fraction of conductive phase, as main input values, are continuously determined by using non-contact electrical resistivity device and CEMHYD3D numerical model, respectively. The results show that an increase of hydration degree shows an improvement with the relative resistivity of solids and a reduction in critical exponent of capillary pores. While the relative resistivity of C-S-H and its exponent present constant values of 121 and 1.8, independent of hydration degree. Finally, the calculated results are compared to the reported values by previous literatures that have a good agreement. © 2013 Elsevier Ltd. All rights reserved.


Zhang W.,Nanjing Southeast University | Zhang Y.,Nanjing Southeast University | Liu L.,Nanjing Southeast University | Liu L.,State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials | And 2 more authors.
Construction and Building Materials | Year: 2012

An ultrasonic measurement apparatus (UMA) was developed for in situ continuously monitoring the early age hydration process of cementitious material. Utilizing UMA, the influence of curing temperature and silica fume content on the setting and hardening process of the low water to binder ratio cementitious material were systematically investigated. The experimental results show that setting and hardening process of the silica fume blended cement paste at elevated temperature can be clearly identified into three stages including dormant stage, acceleration stage and deceleration stage. Besides, the increasing of curing temperature and silica fume content greatly accelerate the setting and hardening process of silica fume blended cement paste and increase the ultimate ultrasonic pulse velocity. To aid in comparing with the ultrasonic results, the isothermal calorimetric measurement, Vicat needle test and mechanical properties test were also conducted. © 2012 Elsevier Ltd. All rights reserved.


Xiao C.,State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials | Xiao C.,Southwest University of Science and Technology | Xu X.,State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials | Xu X.,Southwest University of Science and Technology | And 4 more authors.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2013

Circulating fluidized bed combustion (CFBC) ash is an industrial residue for good pozzolanic, self-hardening and expansion properties. That using CFBC ash with activator composite as a cementitious material to prepare building mortar has the potential to reduce cement usage, enhance water retention of fresh mortar and improve volume stability of mortar. This study examined the feasibility of manufacturing dry-mixed masonry mortar using CFBC ash with activators composite. The parameters affecting the performance of the mortar, such as usage of activator, fineness of CFBC ash, dosage of water-retaining agent, binder-sand ratio and gradation of sand, were investigated. Experimental results indicated that performances of dry-mixed masonry mortar which was prepared according to an ingredient design (85% CFBC ash ground to a certain degree of fineness, 15% activator, binder-sand ratio of 0.5 and sand ratio of 0.5) satisfied specific requirements of GB/T 25181-2010.Performances of mortar included compressive strength of 28 days up to 10.7 MPa, water-retention rate of 94.7%, setting time of 6.9 h and consistency loss rate of 2 h up to 14.1%.


Wu J.,State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials | Wu J.,Southwest University of Science and Technology | Yang W.-B.,State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials | Yang W.-B.,Southwest University of Science and Technology | And 3 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2011

Large-area regular silicon nanowire arrays (SiNWs) were prepared on silicon substrate by electroless metal deposition method under hydrothermal conditions. Mechanism and effects of morphology control of SiNWs were studied. Morphologies and structures of SiNWs and Ag dendritic crystal were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that morphology of SiNWs could be influenced by solution ratio, temperature and reacting time of hydrothermal system. Large-area SiNWs, which the length is 30-50 μm and the diameter is about 200 nm, can be obtained on condition that temperature is 50°C, and concentrations of HF and AgNO3 are 4.6 and 0.02 mol/L, respectively. The electroless metal deposition method is a kind of simple, moderate technology for preparation of silicon nanowires and SiNWs.


Xu X.,Southwest University of Science and Technology | Xu X.,State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials | Zhang Y.,Southwest University of Science and Technology | Zhang Y.,State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials | And 2 more authors.
Procedia Engineering | Year: 2012

Three kinds of phosphorous slag powders from different localities (companies) were selected to test the dissolved phosphorus content in 3d curing age. Influence of different localities of the phosphorous slag powder on water requirement of normal consistency, setting time, soundness and mortar strength was studied. The results showed that the retarding effect of phosphorous slag powder and its dissolved phosphorus content was closely related. Under the condition of the same mixing amount, the more dissolved phosphorus content, the longer setting time. When the specimens contained same phosphorous slag powder, the dissolution rate and dissolved quantity increased with the increase of the specific surface area. And the setting time also increased with the increase of the specific surface area. The defference in the mortar strength of the phosphorous slag powders from different localities May be attributed to the comprehensive effect between retarding effect and pozzolanic effect. © 2011 Published by Elsevier Ltd.


Yi Y.,CAEP - China Academy of Engineering Physics | Yi Y.,State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials | Li K.,CAEP - China Academy of Engineering Physics | Ding Z.-J.,CAEP - China Academy of Engineering Physics | And 4 more authors.
Wuli Xuebao/Acta Physica Sinica | Year: 2011

Considering the Coulomb potential and the exchange action, electronic structure, band structure and magnetic properties of the compound Ni4PrB within the local spin-density approximation (LSDA) and the LSDA+U approximation are studied through numerical simulation. The simulation results show that this system is a metallic semi-conductor and has Pr-Ni ferromagnetic coupling. The added Coulomb U effect can strongly affect magnetic properties and stable structure, and the total magnetic moment is provided by the local Ni magnetic moment before adding U effect, when the U effect is added to the system, the total magnetic moment is provided by the local Pr magnetic moment, and the system has a high structure stability. So U effect affects strongly the strong correlation, then it can describe reasonably the strong correlation and the exclusion effect caused by the spin exclusion. © 2011 Chinese Physical Society.


Yi Y.,State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials | Yi Y.,CAEP - China Academy of Engineering Physics | Ding Z.-J.,State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials | Ding Z.-J.,CAEP - China Academy of Engineering Physics | And 3 more authors.
Wuli Xuebao/Acta Physica Sinica | Year: 2011

The geometry optimization, the electronic and magnetic properties of the compound Ni4NdB are studied by using first-principles within the local spin-density approximation (LSDA) and the LSDA+U approximation. The results indicate that the system is a metallic conductor with very small band gap, and that the total magnetic moment is provided by the local Nd magnetic moment. The system has very complex bonding, where Nd atoms and the neighboring Ni atoms form metal bonding, also Nd atoms and the neighboring B atoms form the strong ionic banding, besides Ni atoms and the neighboring Ni atoms forming an indirect exchange interaction. Under coulomb interaction, the system magnetic moment is consistent with that of the local Nd atom, and the collapse of magnetic ordering in 2.75 eV happens to the local Ni magnetic moment. © 2011 Chinese Physical Society.

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