Highly densified TiC, ZrC and HfC based ultrahigh temperature heteromodulus ceramics (HMC), containing 10-50 vol.-% of low modulus phase in the form of particulate graphite, were prepared by hot pressing at 2700uC and 12 MPa in argon atmosphere. The microstructure, elastic characteristics, flexural and compressive static strength, fracture toughness, impact resistance, hardness and thermal expansion were investigated and compared with those available in earlier works for clear understanding the composition-property correlations and anisotropy of this type of HMC composites. Different thermal shock resistant parameters for the HMC were calculated on the basis of obtained experimental data. A new principle of optimum materials design for the compositions in the refractory carbide-graphite systems is exemplified by the TiC-C HMC materials.

M oi s t u r e s u s c e p ti bility a n d fa ti g u e p e rfo r m a n c e of h y d r a t e d li m e-m o difie d a s p h al t c o n c r e t e : e x p e ri m e n t a n d d e si g n a p plic a tio n c a s e s t u d y Al-Ta m e e mi, AF, Wa n g, Y, Alb ay a ti, A a n d H a y n e s, BJ h t t p:// dx. doi.o r g/ 1 0. 1 0 6 1/(ASC E) MT.1 9 4 3-5 5 3 3 . 0 0 0 2 6 3 4Ti t l e M oi s t u r e s u s c e p ti bility a n d fa ti g u e p e rfo r m a n c e of h y d r a t e d li m e-m o difie d a s p h al t c o n c r e t e : e x p e ri m e n t a n d d e si g n a p plic a tio n c a s e s t u dy A u t h o r sAl-Ta m e e mi, AF, Wa n g, Y, Alb ay a ti, A a n d H a y n e s, BJ Typ eArticl e U RL This ve r sio n is a v ail a bl e a t : h t ABSTRACT 10 Hydrated lime has been recognized as an effective additive used to improve asphalt concrete 11 properties in pavement applications. However, further work is still needed to quantify the effect of 12 hydrated lime on asphaltic concrete performance under varied weather, temperature and 13 environmental conditions and in the application of different pavement courses. A research project 14 has been conducted using hydrated lime to modify the asphalt concretes used for the applications 15 of wearing (surface), levelling (binder) and base courses. A previous publication has reported the 16 experimental study on the resistance to Marshall stability and the volumetric properties, the 17 resilient modulus and permanent deformation at three different weather temperatures. This paper 18 reports the second phase experimental study for material durability, which investigated the effect 19 of hydrated lime content on moisture susceptibility when exposed to a freeze-thaw cycle, and the 20 fatigue life. The experimental results show an improvement in the durability of the modified 21 asphalt concrete mixtures. Optimum hydrated lime contents for different course applications are 22 suggested based on the series experimental studies. Finally, the advantage of using the optimum 23 mixtures for a pavement application is demonstrated. 24 25

Hetero-modulus ceramics (HMC) present the combination of a ceramic matrix with inclusions of a dispersed phase with considerably lower values of Young's modulus, resulting in a material with significantly advanced properties. Densified ´-Si 6-x Al x O x N 8-x based HMC materials, with various volume contents of low-modulus α-BN phase and modifiers such as TiN or ZrO 2 in sialon matrix, were prepared by high-temperature reaction hot-pressing in nitrogen atmosphere. The pristine blend composition for reaction hot-pressing consisted of mixed fine powders of Si, Al, B, Ti nitrides and Al, Zr oxides. Statistical design of 2 5-2 fractional factorial and third-order simplex-grid types was used for the experimental studies to estimate the effects of some technological factors on the densification of hot-pressed products and the property-composition relationships of modified HMC materials.