Effect of industrial waste and RBI Grade 81 on swelling characteristics of clayey soil

Abstract

This paper deals with improvement of swelling characteristics of clayey soil by adding industrial waste and RBI Grade 81. The construction of road in clayey soil is challenging due to its more swelling and more shrinkage characteristics. To overcome this problem there are two solutions one is replace the clayey soil by good quality granular material. The second is stabilizing the subgrade clayey soil by using various industrial wastes. Generally pond ash, fly ash and stone dust are use for soil stabilization. The swelling and shrinkage characteristics of clayey soil are considerably improved if it treated with industrial wastes and RBI Grade 81. The RBI Grade 81 is chemical soil stabilizer. The differential free swell index (DFS) test was carried out on different mix of soil, industrial waste and RBI Grade 81. The result shows that the DFS index of untreated soil obtained is 65% reduces to 35% by addition of 20% fly ash and 4% RBI Grade 81. This reduction in DFS index helps to reduce the effect of moisture variation in clayey soil.Ovaj rad se bavi poboljsanjem karakteristika bubrenja industrijskog otpada dodavanjem nusprodukata industrijske proizvodnje i RBI Grade 81 aditiva. Izgradnja puteva u glinovitom zemljistu je izazov zbog toga sto ta vrsta zemljista ima izrazene karakteristike bubrenja i skupljanja. Da bi se ovaj problem prevazisao, postoje dva resenja. Jedno je da se glinovito tle zameni koriscenjem kvalitetnog zrnastog materijala. Drugo je da se glinovita podloga stabilizuje koriscenjem razlicitog materijala od industrijskog otpada. Uopsteno govoreci, koriste se sljaka, elektrofilterski pepeo i kamena prasina za stabilizaciju tla. Karakteristike bubrenja i skupljanja glinovitog zemljista se mogu popraviti ako se ono tretira nusproduktima industrijske proizvodnje i aditivom RBI Grade 81. RBI Grade 81 je hemijski stabilizator tla. Sprovedeno je ispitivanje difrencijalnog indeksa bubrenja na razlicitim mesavina zemljista, industrijskog otpada i RBI Grade 81. Rezultati pokazuju da je DFS indeks netretiranog zemljista od 65% smanjen na 35% dodavanjem 20% elektrofilterskog pepela i 4% RBI Grade 81. Ovo smanjenje DFS indeksa pomaze da se efekat varijacije vlage u glinovitom zemljistu umanji.