Glyoxal and its derivatives for stabilization of aluminium silicate colloid-dispersed systems

Abstract

Preliminary studies have shown the possibility of using organic-mineral additive based on glyoxal and saponite containing waste for injection strengthening of soils. Modification of the sandy soil with the organic-mineral additive increases its specific cohesion up to 50 times. However, the resulting periodic colloidal structure (PCS) is not resistant to external temperature and humidity effects. The research aim was to evaluate the possibility of obtaining glyoxal derivatives by its chemical interaction with bark lignin substances without their preliminary extraction and test these structures for stabilization of the aluminium silicate colloid-dispersed systems. To activate surface centers of lignin, the bark was ground to the average particle size of 3.2 μm. Identification of IR spectra showed that the characteristic bands for lignin-glyoxal and bark-glyoxal compositions coincide practically and differ significantly from the spectrum of lignin in the range of 500-1500 cm−1. It can confirm the formation of interaction products of bark lignin substances with glyoxal. Before the effect of moisture compressive strength of sandy soil samples with an organic-mineral additive based on glyoxal (reference sample) and its derivatives (test sample) is almost the same and at an average of 6 MPa. However, after moisture saturation the reference sample strength is reduced by 50 times, and the test sample strength is decreased by only 4 times. It confirms the formation of a stable PCS.