The document discusses using waste materials like fly ash and cinder in road construction to increase soil bearing capacity and road stability. It describes several experiments conducted on clayey soil, fly ash, and cinder, including proctor compaction testing, liquid/plastic limit tests, particle size distribution analysis, specific gravity tests, permeability testing, unconfined compression testing, and California Bearing Ratio (CBR) testing. The results showed that clayey soil has the best engineering properties overall, while fly ash individually has some benefits but also weaknesses in permeability resistance and strength, and cinder does not perform well in most tests on its own.