INFLUENCE OF CHEMICAL ADDITIVES INCLUDING LIQUID SODIUM GLASS AND CALCIUM CHLORIDE ON THE STRENGTH OF ARBOLITE
Keywords:
wood-cement composite, building material, polysaccharides, compressive strength, adhesive strengthAbstract
The study examines the influence of chemical additives including liquid sodium silicate and calcium chloride on the strength of arbolite. For the experiments, arbolite blocks measuring 100×100×100 mm were produced using crushed wood, Portland cement grade M400, water, and chemical additives – calcium chloride and liquid sodium silicate. The additives were introduced into the arbolite mixture in amounts of 4, 6, 8, 10, 12, and 14 g, each separately and in a 1:1 mixture. The experimental blocks were demolded after 3 days of curing and tested for compressive strength after 7 and 14 days. The results showed a rapid increase in compressive strength with additive content ranging from 4 to 10 g, followed by a slowdown and stabilization. At 10 g of additives, the compressive strength of arbolite was: 1.49 MPa with liquid sodium silicate, 1.87 MPa with calcium chloride, and 2.37 MPa with a mixture of liquid sodium silicate and calcium chloride. However, the efficiency of the mixture is offset by its crystallization tendency, which complicates the preparation of the arbolite composition. An increase in liquid sodium silicate from 1.0 % to 3.0 % of cement mass improved compressive strength by 26.27 %, while further addition up to 4.2 % increased it by only 1.9 %. An increase in calcium chloride from 1.0 % to 3.0 % improved strength by 18.35 %, while further addition up to 4.2 % increased it by only 1.0 %. A mixture of both additives from 1.0 % to 3.0 % improved strength by 13.97 %, while additional increase up to 4.2 % resulted in only a 0.4 % gain. The curing period of 7–14 days positively affected compressive strength. With 10 g of additives, compressive strength increased from 1.29 to 1.49 MPa with liquid sodium silicate, from 1.67 to 1.87 MPa with calcium chloride, and from 2.18 to 2.37 MPa with the mixture of both additives.
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