in study was conducted in two separate experiments in 2011-2013 in seeds and plant improvement institute. in the first experiment, status growth scion and resistance to spring late frost and content proline in 10 genotypes and cultivar almond, grafted on gf677 rootstock included touno, non pariel, shokofeh, sahand, mamayi, shahrood 12, a200, 1-25, 1-16 and 13-40 with 10 replication as a complet...

Photosynthesis of most plants decreases rapidly when the leaf temperature drops below 100. In contrast, however, several frost resistant plant species still perform appreciable photosynthesis at temperatures below 50 (8). Vetuhova (14, 15) demonstrated that photosvnthesis at low temperature was related to winter hardiness. When leaves were cooled, she observed a smaller depression of photosynth...

Injury inflicted by frost and freezing is found in all plants exposed to such damaging temperatures. Antifreeze proteins protect against these injurious temperatures by providing freeze resistance to organisms in which they occur. The expression of antifreeze proteins in a plant is a possible means of increasing the frost resistance and freeze tolerance of plants. Freeze tolerance curves of non...

Properties of cement-stabilized gravel modified by emulsified asphalt under freezing and thawing cycle conditions were investigated by adjusting the dosage of cement. Mercury intrusion porosimetry (MIP) and Scanning electron microscopy (SEM) were introduced to analyze the influential mechanism. The results indicate that cement emulsified asphalt stabilized gravel with 5 wt % of cement performed...

Introduction . The development of the Arctic Region and oil gas fields in North Atlantic Ocean leads to an increase production high-strength concrete structures. Thus, it is becoming increasingly vital make such low-permeability concretes more freeze-thaw resistant. Aim To conduct experimental studies for obtaining reliable data required develop a standardized approach normalization / frost-sal...

Abstract Aluminum and iron hydroxides, formed in the stone during hydration of cement with addition special slags, significantly improve properties concrete. The low-basic calcium aluminates CA 2 6 form high-alumina slag, which releases a large amount Al(OH) 3 hydration, increases strength, density, water resistance, frost corrosion resistance hydraulic A compressed mixture concrete scrap slag ...

This study aimed at evaluating the scaling resistance of strain-hardening cement-based composite (SHCC) exposed to freezing and thawing cycles. RILEM-CDF test was conducted clarify which parameters composition SHCC have an impact on resistance. The investigation made determine influence following scaling: water cement ratio mortar matrix, fiber volume, air mixing non-binding materials, namely l...