PLC在玻璃原料混合控制系统中的应用

分析了玻璃原料混合的工艺流程,针对原系统中质量不稳定的缺限,改造和优化设计了原混合控制方案和功能。采用日本OMRON公司C200H系列PLC为核心,组成混合自动控制系统,实现了混合机的升级换代,提高了混合料的质量和合格率,改善了工作环境。

抗老化玻璃纤维沥青混合料路用性能研究

为研究受阻酚抗氧剂Irganox 1010作为抗老化外掺剂对玻璃纤维沥青混合料抗老化性能的增强效果,以玻璃纤维沥青混合料为基础材料,探究各温度环境下Irganox 1010掺量对其性能的影响规律,利用马歇尔试验、半圆弯拉试验以及冻融劈裂试验评价复合改性沥青混合料的高温稳定性、低温抗裂性及水稳定性。研究表明:1)Irganox 1010的掺入可使沥青混合料的抗老化性能得到明显改善,但会降低老化前后沥青混合料的高温强度;2)当Irganox 1010掺量为1%时,沥青混合料在中、低温条件下具有良好的抗裂性和抗老化能力,且在此掺量下,混合料具有良好的水稳定性;3)建议Irganox 1010的掺量以1%为宜。

Irganox 1010对玻璃纤维沥青混合料低温性能影响研究

通过在基质沥青中添加不同掺量Irganox 1010制备AC-16改性纤维沥青混合料,进行低温间接拉伸试验,分析Irganox1010对玻璃纤维沥青混合料低温性能的影响。结果表明:Irganox 1010对玻璃纤维沥青混合料破坏应变和模量的影响相较于劈裂抗拉强度更为显著。其中,破坏劲度模量随Irganox 1010掺量提高呈线性增长趋势,当掺量为1%时破坏拉伸应变最大,而劈裂抗拉强度指标随Irganox 1010掺量变化不明显。综合分析玻璃纤维沥青混合料低温性能指标,为实现其良好的低温路用性能,建议工程实际应用中Irganox 1010掺量为1%为宜。

Design and evaluation of glasphalt mixtures by using recycled waste cullet

A glass crusher was developed to improve the waste glass crushing process.The waste glass was recycled,crushed and sieved to different particle sizes as glass aggregates,and the surface of glass aggregates was treated by nano-Fe2O3 suspension to improve the anti-striping property.The glasphalt mixture made by partly replacing mineral aggregates with glass aggregates was designed and evaluated.The sizes of glass aggregates were selected to be 2.36 and 4.75 mm,and the optimum concentration of nano-Fe2O3 suspension was determined to be 10%.The optimum asphalt content(OAC)was determined by the Marshall method and the glass aggregate content.The influence of the glass aggregate content on the technical properties of glasphalt mixtures were analyzed by the rutting test,three-point bending test,freeze-thaw splitting test and skid resistance test.The results show that the optimal content of glass aggregates and OAC are recommended to be 15%and 4.4%,respectively.These environmentally-friendly glasphalt mixtures can solve the problem of environmental pollution caused by waste glass,as well as reducing the cost of pavement materials and construction.

Nonlinear behavior of concrete beams with hybrid FRP and stainless steel reinforcements

The full-range behavior of partially bonded, together with partially prestressed concrete beams containing fiber reinforced polymer （FRP） tendons and stainless steel reinforcing bars was simulated using a simplified theoretical model. The model assumes that a section in the beam has a trilinear moment--curvature relationship characterized by three particular points, initial cracking of concrete, yielding of non-prestressed steel, and crushing of concrete or rupturing of prestressing tendons. Predictions from the model were compared with the limited available test data, and a reasonable agreement was obtained. A detailed parametric study of the behavior of the prestressed concrete beams with hybrid FRP and stainless steel reinforcements was conducted. It can be concluded that the deformability of the beam can be enhanced by increasing the ultimate compressive strain of concrete, unhonded length of tendon, percentage of compressive reinforcement and partial prestress ratio, and decreasing the effective prestress in tendons, and increasing in ultimate compressive strain of concrete is the most efficient one. The deformability of the beam is almost directly proportional to the concrete ultimate strain provided the failure mode is concrete crushing, even though the concrete ultimate strain has less influence on the load-carrying capacity.

Behaviour of GFRP R.C. Slabs in Flexure in Localenvironment An Experimental Study

A variety of new materials in the field of concrete technology have been developed during the past three decades with the ongoing demand of construction industry to meet the functional, strength, economical and durability requirements. Though reinforced concrete has high strength and is most widely used construction material it suffers from disadvantages like corrosion of steel, susceptibility to chemical and environmental attack. In order to overcome the above deficiencies of reinforced concrete new materials （special concrete composites） have been developed over the past three decades. Glass Fibre Reinforced Polymer （GFRP） is one such material with wide range of applications. Based on the preliminary investigations on GFRP bars, an optimum fiber/resin ratio of 7：3 was arrived. The tensile strength of GFRP bars is comparable to that of the mild steel as per the tests carried out, but the modulus of elasticity is about 25-30 percentage of that of steel bars. This paper deals with the experimental investigations carried out on small slab panels supported on all four edges with effective spans of 0.9 m ~ 0.45 m, which is a part of large research problem undertaken with different ratios of 10ng span to short span with different support conditions. The test results are compared with similar slab panels reinforced with conventional mild steel bars.

Strengthening of Pultruded Glass FRP Section Combined with Concrete Slab Using CFRP Plates

This paper demonstrates the possibility of combining both glass and carbon FRP （Fibre Reinforced Polymer） composite materials with a low-cost construction material （i.e. concrete） in a hybrid system that brings higher performance levels to the design of lightweight, corrosion resistant, yet inexpensive beams providing acceptable structural properties. The objective of the research is to investigate the behaviour of a hybrid composite section under flexure. The hybrid section consists of a top concrete slab, Glass Fibre Reinforced Polymer （GFRP） beam section and Carbon Fibre Reinforced Polymer （CFRP） laminate on the extreme underside. This maximizes the benefits of each material, that is： high tensile strength of CFRP, compressive strength and low cost of concrete, light weight and lower cost of GFRP, and high corrosion resistance of all components. Three beam samples were manufactured and tested to failure while monitoring deflections and strains. By adding CFRP layers under the concrete-GFRP composite beam increases the bending strength and reduces the deflection. The most important factor in the proposed strengthening technique of GFRP-concrete composite beams by using CFRP is the adhesive material that bonds the CFRP to the GFRP. Any weakness in CFRP-GFRP bond may cause brittle failure of the beam. The study results indicate the benefits of using hybrid FRP-concrete beams to increase flexural load carrying capacity and beam stiffness and provide a numerical model that can be further developed to model more advanced material arrangements in the future. The outcome of this research provides information for both designers and researchers in the field of FRP composites.

废玻璃沥青混凝土反光路面应用研究

废玻璃再生利用于反光路面,可以达到环保、交通诱导或警示和景观的效果。文章通过沥青混合料的室内试验,确定不同玻璃掺量混合料的配比,研究不同玻璃掺量沥青混合料的路用性能、性能提升的措施效果。应用小型浸水加速加载(MMLS3)试验,综合验证废玻璃沥青混合料的高温抗车辙、抗剥落和反光效果等长期性能。试验结果表明玻璃掺量较大时,路用性能(高温、低温、抗水损)等指标有所下降;掺量较小时,指标变化不大;反光度随掺量变化明显增大。综合考虑性能和效果,控制废玻璃掺量,沥青混合料可以达到应用的技术要求,研究成果在浙江省庆元县54省道中得到验证。

Synthesis of metallic glasses and metallic glass based composites in the Cu-Mo-Hf system by ion beam mixing

Single-phase and dual-phase metallic glasses as well as metallic glass based composites were synthesized in the Cu-Mo-Hf ternary metal system by 200 keV xenon ion beam mixing of far-from-equilibrium. It was found that Mo-Hf-based and Cu-Mo-based single-phase metallic glasses could be obtained at compositions around CulTMo20Hf63 and Cu34Mo57Hf9, respectively. Interestingly, at the nearly equal-atomic stoichiometry of Cu38Mo31Hf3i, a dual-phase Cu-Mo-Hf metallic glass, consisting both of the Mo-Hf-based and Cu-Mo-based phases, was first obtained at relatively low irradiation doses ranging from （1-5）×10^15 Xe＋/cm2, and a single-phase metallic glass was eventually obtained at a dose of 7×10^15 Xe＋/cm2. In addition, two glass-based composites were obtained at the compositions of Cu14Mo62Hf24 and Cu77Mo14Hf9, and they consisted of the Mo-Hf based and Cu-Mo based metallic glasses, dissolved with some uniformly distributed BCC Mo-based and FCC Cu-based crystalline solid solutions, respectively. The formation mechanism of the above described non-equilibrium alloy phases was also discussed in terms of the atomic collision theory.