Experimental Study on Foaming Characteristics of Foamed Asphalt

2013 ◽  
Vol 361-363 ◽  
pp. 1507-1510
Author(s):  
Li Li ◽  
Zhou Chao ◽  
Wang Nian ◽  
Wei Hua Qiao
Keyword(s):  
Experimental Study ◽  
Water Temperature ◽  
Water Content ◽  
Half Life ◽  
Expansion Ratio ◽  
Maximum Expansion ◽  
Foamed Asphalt

This paper presents study on foaming characteristics of two types asphalt with same Penetration-grade 70. Asphalt temperature (AT), water content (WC) and water temperature (WT) were selected for investigation their effects on the asphalt foamability. Maximum expansion ratio (ERMax) and half-life (HL) are important indicators of foamed asphalt. It is concluded that ERMax*HL reachs maximum at optimum foaming condition of foamed asphalt. The conclusion is used as criterion for optimizing foaming condition. The fact that the water temperature influences the ERMax and HL of foamed asphalt significantly was presented.

Study on Modified Asphalt Foaming Characteristic Basing on Energy Analysis

2014 ◽  
Vol 1065-1069 ◽  
pp. 1842-1845
Author(s):  
Feng Cheng Wang ◽  
Xue Feng Nan
Keyword(s):  
Moisture Content ◽  
Half Life ◽  
Energy Analysis ◽  
Expansion Ratio ◽  
Stored Energy ◽  
Maximum Expansion ◽  
Modified Asphalt ◽  
Foamed Asphalt ◽  
Foam Index

Studying on the modified asphalt foaming characteristic, the energy indexes of the actual maximum expansion ratio and the foam index influencing on the modified asphalt foaming effect is analyzed reasonably by varying moisture content. The results show that the half-life of modified foamed asphalt decay sharply with the decrease of SBS content (modified asphalt viscosity),the moisture being mainly applied to modified asphalt foaming is proved with actual max expansion ratio index and evaporated vastly with the decrease of SBS content (modified asphalt viscosity), the modified foamed asphalt stored energy internally is reflected by the foam energy and corrected according to the viscosity.

scholarly journals Bitumen Foaming Optimisation Process on the Basis of Rheological Properties

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1854 ◽  
Author(s):  
Marek Iwański ◽  
Grzegorz Mazurek ◽  
Przemysław Buczyński
Keyword(s):  
Half Life ◽  
Expansion Ratio ◽  
Fractional Factorial ◽  
Effective Control ◽  
Maximum Expansion ◽  
Foaming Process ◽  
Original Apparatus ◽  
Foam Properties ◽  
Foamed Bitumen ◽  
Intended Use

This article discusses the results of bitumen foam properties optimisation with respect to three factors: air pressure, bitumen temperature and amount of water. The test materials were unmodified bitumen 50/70 and bitumen 50/70 modified with 2.5% synthetic wax. The experiment was designed according to the 3(3−1) fractional factorial design. The distribution of parameters of bitumen foam were measured with the authors’ original apparatus using a laser beam. This measurement method increased the accuracy of maximum expansion ratio (ER) and half-life (HL) estimation. Based on HL and ER results, it was found that the foaming process increased bitumen stiffness due to the dynamic ageing of the bitumen. The experimental design allows more effective control over the properties of foamed bitumen with respect to its intended use. The presence of synthetic wax extended the half-life of the bitumen foam.

Experimental Investigation on Steam Jet Condensation in Subcooled Water Through Double Nozzle

2018 ◽  
Author(s):  
Weichao Li ◽  
Zhaoming Meng ◽  
Zhongning Sun ◽  
Jiaqing Liu
Keyword(s):  
Experimental Investigation ◽  
Water Temperature ◽  
Mass Velocity ◽  
Dominant Frequency ◽  
Expansion Ratio ◽  
Condensation Process ◽  
Equivalent Diameter ◽  
Oscillation Regime ◽  
Maximum Expansion ◽  
Steam Bubble

Experimental investigation has been conducted to explore the effect of double nozzle on the characteristics of steam jet condensation. The condensation process and jet noise are recorded by high speed camera and hydrophone, respectively. Five typical condensation regimes are identified based on the shape of steam plume. A condensation map suitable for both single nozzle and double nozzle is developed based on steam mass velocity and water temperature. The maximum expansion ratio of steam plume increases with the rise of steam mass velocity and water temperature. The maximum expansion ratio of double nozzle becomes larger than single nozzle as the water temperature increases. The equivalent diameter of steam bubble in condensation oscillation regime increases with the rise of water temperature. The forming frequency of steam bubble decreases with the rise of water temperature. There is no remarkable difference of the steam bubble equivalent diameter between single and double nozzle. However, the steam bubble forming frequency of double nozzle experiments is smaller than single nozzle experiments. The first dominant frequency decreases with the rise of water temperature and it is very close to the steam bubble forming frequency in condensation oscillation regime. The double nozzle can reduce the first dominant frequency about 5% at the steam mass velocity of 400 kg/m2s and 15% at the steam mass velocity of 800 kg/m2s.

scholarly journals Effect of water temperature and pH on the concentration and time of ozone saturation

2018 ◽  
Vol 21 (0) ◽  
Author(s):  
Melicia Cintia Galdeano ◽  
Allan Eduardo Wilhelm ◽  
Isabella Borges Goulart ◽  
Renata Valeriano Tonon ◽  
Otniel Freitas-Silva ◽  
...  
Keyword(s):  
Water Temperature ◽  
Molecular Oxygen ◽  
Half Life ◽  
Low Ph ◽  
Ozone Content ◽  
Effect Of Temperature ◽  
Saturation Time ◽  
Gas Concentration ◽  
Ph Values ◽  
Effect Of Water

Abstract Ozone has been used for many years to disinfect water due to its oxidizing potential. Since it decomposes quickly into molecular oxygen, leaving no residue, it has important advantages for use. The decomposition of ozone is affected by the temperature and pH of the medium, low pH values and temperatures increasing its half-life, which can result in more efficient disinfection. With the objective of increasing the effectiveness of ozonation, this study investigated the effect of temperature (8 ºC and 25 °C) and pH (3.0 and 6.0) of the water on the saturation time and gas concentration, employing two initial gas concentrations (13.3 and 22.3 mg L-1). The concentration of ozone saturation increased as the temperature and pH of the medium decreased, as also with the higher initial gas concentration ( C0). The highest saturation concentrations were obtained at pH 3.0 and 8 °C (4.50 and 8.03 mg L-1 with C0 of 13.3 and 22.3 mg L-1, respectively). This higher ozone content could result in greater decontamination efficiency of the food products washed with this water.

Experimental Study on the Influence of other Factors on Compression Resistance Performance of Emulsion Explosives in Deep Water

2014 ◽  
Vol 535 ◽  
pp. 729-733
Author(s):  
Lei Liu ◽  
Qiang Liu ◽  
Li Cheng
Keyword(s):  
Experimental Study ◽  
Water Content ◽  
Deep Water ◽  
Experimental Results ◽  
Paraffin Wax ◽  
Emulsion Explosive ◽  
Emulsion Explosives ◽  
Small Influence ◽  
Resistance Performance ◽  
Compression Resistance

Since oil phase materials, oxidizer, and water are important components of emulsion explosive, their influences on compression resistance performance of emulsion explosives in deep water was studied by using reusable experiment device to simulate the deep charging environment. The experimental results show that with the equivalent content of the oil phase material, the sequence of three oil phase types of emulsion explosives from good to bad in terms of compression resistance performance and explosion performance in deep water are composite wax, composite wax and machine oil, paraffin wax, vaseline and machine oil. With the equivalent content of oxidant, the type of oxidant species has quite small influence on compression resistance performance and explosion property. Within a certain range, water content has small influence on compression resistance performance, and explosion performance increases with the increasement of water content, while it significantly decreases with water content increasing to a certain amount.

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