Alternative to river sand is made by crushing rocks using new technology.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/andhra-pradesh-pushes-crushed-rock-sand
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-chronicle-hyderabad
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/andhra-pradesh
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining
[5] http://admin.indiaenvironmentportal.org.in/thesaurus/sand-mining
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rivers
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/polavaram
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/construction-industry