Sand-aggregate ratio

Water-reducing admixture Air-entraining admixture Slump (mm) Air content (%) Sand-aggregate ratio ml cm of surface % total mix water... 

Such requirements can often be met by specially designed mixes for individual jobs, almost always involving a compromise in sand-aggregate ratio and water content. However, even with good mix design the incidence... 

Sand-aggregate ratio or sand percentage (by volume)... 

The slump (St) of latex-modified concrete can be predicted with every polymer type and at each sand-aggregate ratio by using slump control factor (q>) as follows ... 

Concrete mix design type II cement, water/cement ratio = 0.51 cement sand aggregate ratio = 1 2 5 3.4 by maximum aggregate size in. Fog-cured 28 days. 

Figures 4.1 and 4.21 1 1 represent the effect of unit water content (or water-cement ratio) and polymer-cement ratio on the consistency of latex-modified mortars and concretes, respectively. The flow of the latex-modified mortars increases with increasing water-cement ratio and polymer-cement ratio. The slump of the latex-modified concretes tends to increase with rising unit water content (or water-cement ratio) and polymer-cement ratio, and at each unit water content, a rise in the polymer-cement ratio causes an increase in the slump. This tendency is more significant at smaller sand-aggregate ratios and at large unit cement content Considering these factors, Ohama, et al.Pi have expanded Lyse s rule of constant water contenton ordinary cement concrete, W and defined slump control factor as follows ...

Remarks S/a Sand to aggregate ratio, AE air entraining agent, SP superplasticizer, C cement,... 

Design grade Water cement ratio Sand coarse aggregate ratio % Cement/kg Water/kg Coarse aggregate (kg) Fine aggregate (kg)... 

This research work addressed an important problem in the restoration sector concerning the reassembling of stone fragments from ancient monuments using non-eementitious mortars. The proposed adhesive mortars contain hydraulic lime or metakaolin and lime as binders, carbonate sand with grains between 250 and 63 pm and binder to aggregate ratio 1 or 2. The nano-titania as additive was employed in a binder replacement of 4.5-6% w/w. 

In the test, the mix proportions of different mixes (the ratio of water binder sand aggregate ) were almost the same with different dosages of fly ash, slag and natural pozzolan. From Fig.5, we can deduce some interesting observations ... 

The mix proportion for cement sand aggregate were 1 1.07 3,56 for concrete composite with basalt aggregate (B) and 1 0,9 3,24 for concrete composite with limestone aggregate (L). Both proportions were designed for equal mix density with 400 kgs of cement for 1 m and water/cement ratio was equal to 0.6. The volumetric contents of fibres were 0.0%, 0.7% and 1.3%. 

Concrete which is produced using fine aggregates deficient at the fine end of grading, e.g. sea dredged aggregates, exhibit a tendency to bleed and segregate. The presence of a small amount of entrained air (2-4% by volume) leads to an improvement in cohesion, or mix stability. Alternatively, with mixes which are adequate in this respect, a reduction in sand content can be made when air is entrained without loss of cohesion. The amount that can be removed is approximately equal on a volume basis and leads to a reduction in water-cement ratio to minimize the effect of entrained air on compressive strength. 

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