In few years Ramkrishna and Jaidayal established six cement factories in, Dandot, Shantinagar, Dalmiapuram, Rajgangpur,Jind and one more factory in Karachi.
He was assisted by his younger brother Jaidayal Dalmia and son in law Sahu Shanti Prasad Jain in establishing many factories of Rohtas Industries Ltd. in Dalmianagar.