Papers by Keyword: Deicing Salt

Abstract: In order to guarantee the safety and smooth of road traffic in low temperature season, deicing salt is usually adopted to solute the problem of bridge deck snow. However, the frequent use of de-icing salt causes the salt frozen erosion damage of concrete, at the same time, it induces to internal corrosion of steel bars and concrete material performance, furthermore, it will also result in the bridge structure durability degradation, shorten the service life of the bridge. Aiming at this phenomenon, this paper analyzes the mechanism of concrete frost damage, and put forward the corresponding prevention measures.

Abstract: In order to reduce the damage of deicing salt to green belt soil in highway, the research used organic multi-fertilizer SFO featured with water conservation and anti-deicing salt to test the effect on plant growth and soil moisture and ion composition in Jingcheng high way, Beijing, It set 12 t/hm²7.5 t/hm²4.5 t/hm² dosage processing in test Experimental index include plant growth, soil moisture, ion composition and the improvement effect of saline-alkali soil. In treatment of 4.5 t/hm² and 7.5 t/hm² SFO dosage, the fresh treetop growth of Juniper were increased 25.9% and 85.7% higher than that of CK, but less than that in treatment of 12 t/hm² dosage. The soil moisture in all treatments was improved 0.8% -2.1% high than that in CK. The analysis showed that SFO can regulate the ion balance of soil, Ca²⁺Mg²⁺K⁺ content of soil in all treatments were raised as the increasing of SFO dosage, but the Na+Cl-ion contens decreased 38% and 48% on average than that of CK,and the Sodium Adsorption Ratio (SAR) significantly was reduced markedly. In which the 7.5 t/hm² dosage treatment of SFO is the best effect. The results certificated that SFO has the comprehensive effect on reducing soil salinization and can improve soil structure and the soil moisture, and can be applied in controlling soil salinization of green belt caused by using deicing salt in high way widely.

Abstract: In this article, the classification and effects on environment of deicing salt are described, and the total components of two sorts of deicing salt commonly used in Beijing are analyzed, then we collected soil samples in Beijing’s main roads and areas, determined the soil pH and electrical conductivity, the results show that the value in roadside soil significantly higher than that in background. In addition, the soil pollution discipline in Beijing was studied.

Abstract: The present study was designed to elucidate the Catalase (CAT) activity and malondialdehyde (MDA) contents in gills and muscle tissues of Zebrafish in exposure to different concentrations of deicing salt. According to the value of 96 h LC50, five different concentration treatments (4.30, 5.38, 6.73, 8.41 and 10.51 g/L) of deicing salt were set up with no application of deicing salt (0 g/L) as control treatment, and the activity of CAT and MDA in the gills and muscle tissues of Zebrafish were measured at 1d, 4d, and 7 d exposure. The results showed that the 96 h LC50 value of deicing salt for Zebrafish was 13.49 g/L and the safe concentration was 4.26 g/L. The CAT activity in muscle tissues of Zebrafish was activated significantly (P<0.01) at 1d, and was inhibited significantly with the concentration of 10.51 g/L (P<0.05) by comparing with the control treatment during the whole experimental time. However, the CAT activity in gills was activated significantly (P<0.01) with the concentration of 5.38 g/L, and inhibited significantly (P<0.05) with the concentration of 10.51 g/L. The MDA contents in gills of Zebrafish enhanced gradually with the deicing salt concentration increased. In muscle tissues of Zebrafish, MDA contents decreased gradually during the whole experimental time.

Abstract: Accumulation of high concentrations of Na and Cl ions in soils is one factor that hampers plant establishment along roadsides in regions where deicing salts are used to improve winter driving conditions. However, there is little information on the accumulation of deicing salts in roadside soil as well as on the phytotoxic impact of deicing salts on pines in Northeast China. The accumulation of salt in soil and injuries on pine needles (Pinus tabulaeformis) were investigated in the urban areas of Shenyang city in 2011. The results showed that the use of deicing salts on roads leads to the high accumulation of sodium (352–513 mg•kg^-1) and chloride (577–2,353 mg•kg^-1) in urban roadside soil. High pH and EC values suggested that the alkaline status and high soluble salts in the soil. High accumulation of deicing salts in roadside soil has been shown to have a phytotoxic effect on pines (Pinus tabulaeformis). Concentrations of Na and Cl in leaves were higher in the roadside plants than the plants appearing healthy in control site. The accumulation of Na and Cl in the needles were present up to an average of 274 mg•kg^-1 (24–672 mg•kg^-1) and 3,681 mg•kg^-1 (786–9,919 mg•kg^-1), respectively. It is evident that the deicing salts spray has a significant effect on the accumulation of sodium and chloride in urban roadside soils and needles of Pinus tabulaeformis, as well as the occurrence of visible injuries.

Abstract: This experiment used dolomite and the pyroligneous liquid in the process of evaporation and carbonization of apple sticks. We used transformation, mixing, evaporation drying and a series of reaction processes to prepare light-colored low-cost calcium acetate magnesium salt (CMA) environment-friendly deicing salt. Also we tested its performance of melting ice and snow. Its best melting temperature is from -6°C to -11°C. Compared with deicing salt containing chloride ions, it has a higher melting efficiency.

Abstract: Through analyzing the process of brake, a dynamic model of automobile and a model of the relationship between braking distance and adhesion coefficient were formed; also a simulation calculating model of braking distance was established with the use of Matlab. Finally, a research was done toward the braking distance of a type of a car running on a road after using snow-melting agent. On one hand, with the application of the simulation model which has been established, calculations have been done to the braking distance of Bora vehicles running on roads after using deicing salt; on the other hand, by experiments, Bora vehicles’ braking distance and maximum braking deceleration under the same road condition were measured, meanwhile, the established simulation model was verified.

Abstract: This paper investigated a new type of admixture which can be used to enhance the resistance of concrete surface to deicing salt deteriorating. Physical and mechanical properties of concrete incorporating this salt-scaling resistant admixture were measured. Practical application on site has proved that this admixture is effective for concrete to resist salt-scaling action.

Abstract: This paper investigated a new type of admixture which can be used to enhance the resistance of concrete surface to deicing salt deteriorating. Physical and mechanical properties of concrete incorporating this salt-scaling resistant admixture were measured. Practical application on site has proved that this admixture is effective for concrete to resist salt-scaling action.