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Effect of Methyl Silicone Oil to Moisture Resistance of Sodium Silicate Sands by Microwave Hardening

Wang Huafang, Gao Xiang, Yang Lei, He Wei, Lu Jijun

Archives of Foundry Engineering

2022

Vol. 22, iss. 1

43--47

The sodium silicate sands hardened by microwave have the advantages of high strength, fast hardening speed and low residual strength with the lower addition of sodium silicate. However, the sodium ion in the sands will absorb moisture from the atmosphere, which would lead to lower storing strength, so the protection of a bonding bridge of sodium silicate between the sands is crucial. Methyl silicone oil is a cheap hydrophobic industrial raw material. The influence of the addition amount of methyl silicone oil modifier on compressive strength and moisture absorption of sodium silicate sands was studied in this work. The microscopic analysis of modified before and after sodium silicate sands has been carried on employing scanning electron microscopy(SEM) and energy spectrum analysis(EDS). The results showed that the strength of modified sodium silicate sands was significantly higher than that of unmodified sodium silicate sands, and the best addition of methyl silicone oil in the quantity of sodium silicate was 15%. It was also found that the bonding bridge of modified sodium silicate sands was the density and the adhesive film was smooth, and the methyl silicone oil was completely covered on the surface of the sodium silicate bonding bridge to protect it.

Incorporation of capillary properties of materials in modeling of courtain walls loaded by the wind-driven rain

Alsabry A.

International Journal of Applied Mechanics and Engineering

2011

Vol. 16, no 4

1205-1213

In evaluation of the state of moisture of courting walls one needs data of the intensity of the rainfall on a vertical surface of the construction (wind-driven rain) WDR and of the absorption coefficient of the rain. In this work a mathematical model is presented which allows to estimate the state or moisture of courting wall s under the action of wind-driven rainfalls. This model does not require the use of the average rain absorption coefficient proposed by Kunzel (i.e., it allows to avoid averaging of water absorption ability of the material) and increases the accuracy of the estimation of the state of imbuement of courting walls, in some cases on 30% (depending on climatic conditions).