Physical Characterization and Optimization of Fineness Moduli of Natural Sand from The North Region of Cameroon Used in Construction

Authors : Bertin KAGONBÉ

Pages : 407-419

Doi:10.29187/jscmt.2020.45

View : 8 | Download : 5

Publication Date : 2020-04-15

Article Type : Research Paper

Abstract :This paper deals with the physical characterization and the optimization of fineness moduli of some natural sand samples for their appropriate valorization in construction in North Cameroon. Five sands samples insert ignore into journalissuearticles values(SN5, SB1, SB2, SB3 and SB4); were selected from various locations. Tests conducted include Particle size analysis, Organic impurities, Sand Equivalent and Bulk density. Fineness Modulus insert ignore into journalissuearticles values(FM);, Mean grain, Sorting index insert ignore into journalissuearticles values(Si);, Skewedness index and Uniformity coefficient have been deducted mathematically. Results shown that the particle size distribution curves of the studied sands have an `S` shape. The sand equivalent values vary between 91.1 and 96.8 %, characteristic of very clean sand. The fineness moduli values vary between 1.9 and 3.4 except for samples SB1 and SB2 which are coarser with values of 3.4 and 3.3 respectively. Others results shown that all the sands are pure insert ignore into journalissuearticles values(impurity level less than 0.5 %);, well classified Sorting index Si  0.35); and Coefficient of uniformity insert ignore into journalissuearticles values(Cu  2);. Studied sands are globally coarse insert ignore into journalissuearticles values(skewedness index between -0.35 at -0.79);. Only SB4 and SN5 satisfy the NF EN 933-1 gradation limits. Combinations of SB3 insert ignore into journalissuearticles values(FM = 2.1); with SB1 insert ignore into journalissuearticles values(FM =3.4); or SB2 insert ignore into journalissuearticles values(FM= 3.3); were carried out to get desired sand gradation insert ignore into journalissuearticles values(2.2 to 2.8);, SB4 and SN5 having already good fineness moduli of 2.6 and 2.8 respectively.
Keywords : Natural Sand, physical characterization, fineness modulus, North Cameroon