Prismatic (20 x 55 x 90 mm) reinforced mortar specimens (0.35:0.50 water-cement ratio
and 1:3 cement-sand ratio) were made (Figure 1) and cured at 100% RH.
Figure 8 shows the relationship between the water-cement ratio
and funnel viscosity of expandable material with high water content.
After determining the strength, stiffness, grading, and the maximum size of the coarse aggregate in the field, the test used the orthogonal test design method (Table 2) to design pure cement (nonaggregate) samples with a same water-cement ratio
for each gangue concrete group to provide a comparison.
Material Unit Weight (kg/[m.sup.3]) 20 MPa 30 MPa Slump (cm) 10 [+ or -] 2 10 [+ or -] 2 Cement 395 468 Crushed stone 1222 1085 Sand 605 700 Free water 205 205 Water-cement ratio
(%) 52 44 Gmax (mm) 20 20 s/a (%) 32 39 Calcium stearate 0, 1, 5, 10 0, 1, 5, 10 Unit Weight Material (kg/[m.sup.3]) 40 MPa Slump (cm) 10 [+ or -] 2 Cement 535 Crushed stone 870 Sand 750 Free water 210 Water-cement ratio
(%) 0.39 Gmax (mm) 20 s/a (%) 45 Calcium stearate 0, 1, 5, 10 Table 2: The quantity of specimens.
Among specific topics are the experimental investigation of the influence of water-cement ratio
on air-void parameters of cement concrete, particle flow erosion precision electroforming technology, the preparation and adsorption property of nano-rods hydroxyapatite using cation surfactant templates, the energy and environmental performance of a project using solar hot water systems with vacuum tube materials, and the application potential of climate-adaptive window materials.
The rheological parameters of cement grout are time varying and depend significantly on the grouting time, the water-cement ratio
, and the water temperature.
was constant for all prepared mixes (Table 1).
Dosac Lite stores only one program, precisely repeating the water-cement ratio
and mixing time batch after batch, for as long as water and grout are available.
can be maintained, while still providing workability through dispersants.
S Bhanja, B Sengupta, Water-cement ratio
law and silica fume concrete mix design.
Both compared methods showed a variation in porosity, depending on the water-cement ratio
. The concrete of a lower W/C, amounting to 0.44, was more porous that the concrete with the ratio W/C = 0.58.