Abstract
In the spirit of the sustainable buildings, and with the goal of protection of river courses, in the near future an already announced directive ordering closing down of a large number of river aggregate dredging operations will be adopted. For that reason, usage of crushed mineral aggregate in concrete mixes is increasing. Irrespective of downsides of the fined crushed mineral aggregate, such as the presence of fine particles bordering the upper permissible limit and the unfavorable shape of the grain of the course aggregate for obtaining liquid consistency required for the pumpable concrete, the demanded pumpability of concrete during transport and placement has been achieved. By adding admixtures to concrete, the required concrete properties, such as: frost resistance, simultaneous frost and salt resistance and water tightness have been achieved.
Highlights
Concrete has a high degree of heterogeneity, and it may be assumed to be a multiphase material consisting of coarse aggregate embedded in mortar matrix and an interfacial zone between the particles of coarse aggregate and the hydrated cement paste
It is best to mix the crushed fine limestone aggregate in the composition of concrete adapted for required conditions of liquid consistency, pumpability and transport time with the fine river aggregate in (50% : 50% ) ratio
This reduces the share of the particles smaller than 0.125 mm, and this accomplishes the required w/c factor, consistency, i.e. pumpability of concrete
Summary
Concrete has a high degree of heterogeneity, and it may be assumed to be a multiphase material consisting of coarse aggregate embedded in mortar matrix and an interfacial zone between the particles of coarse aggregate and the hydrated cement paste. Economy is not the only reason for which aggregate is used It helps in achieving considerable technical advantages in concrete, providing much more enhanced stability of volume and much better durability than the cement paste alone[4,5]. All those properties can have an important impact on concrete quality – both in fresh and hardened states [7,8] Even though all these properties can be examined separately, it is extremely difficult to provide a precise definition of a good aggregate; it can only be said that it is the aggregate which allows making good concrete under given circumstances and for a specific purpose [9]. Testing of stone aggregate helps us evaluate how suitable or unsuitable it is for making concrete [10,11]
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