Dear reader here we will learn about comparison between cement/lime with bitumen. Cement bricks are produced by treating soil generally with 5% cement and bitumen-treated bricks are stabilized by 1% bitumen.
The strength and moisture repellent property will be our concern here. Cement stabilized bricks have better strength but have poor performance in water/moisture resistance in relation to bitumen stabilized blocks. In our last part we learnt that cement blocks are both stronger and more water/moisture resistant than lime stabilized block.
The bearing strength of cement block and bitumen block are respectively 4 N/mm2 and 3N/mm2.
So where water resistance is the primary criteria we should go for bitumen as stabilizer and where strength is main criteria we should go for cement as stabilizer.
The promotion of soil block is patronized by ASTRA (Association of Science and Technology for Rural Area) at Indian Institute of Science (IISc) and NBO RHDC both of Bangalore. They played most important role in introducing soil block as building construction materials in Karnataka.
Rice husk has been tried also for stabilizing soil and found promising results. Dear reader we have discussed about rice husk as pozzolana for concrete in previous post.