Effects of Chemical Admixtures on the Working and Mechanical Properties of Ordinary Dry-Mixed Mortar

Table 2

Main properties of sand.

Mud content (%)	Clay lump (%)	Fineness modulus	Apparent density (kg/m^3)	Loose density (kg/m^3)	Porosity (%)
1.05	0.15	2.43	2630	1500	44

Note. Mud content is the particle content of natural sand with nominal particle size less than 0.075 mm. Clay lump: the nominal particle size in natural sand is greater than 1.25 mm and the lump is cleaned with water, and the content of particles is smaller than 630 microns after hand pinching.