Umoh AA, Ujene AO. Improving the strength performance of high volume periwinkle shell ash blended cement concrete with sodium nitrate as accelerator. JCEST [Internet]. 2015 Sep. 1 [cited 2024 Nov. 25];6(2):18-22. Available from: https://publisher.unimas.my/ojs/index.php/JCEST/article/view/147