Seeking fine aggregates that can be used in place of sand in concrete. Does anyone know of some?
This link might be useful for your query. http://www.ajol.info/index.php/ajest/article/download/71951/60908%E2%80%8E
Yes we had used Rock Crushing Dust in proportion 50:50 with sand for mixing as fine aggregate .
Search among different industrial by-products available in your area. Take into account the transportation costs, because such materials cost almost nothing. Suitable candidates to replace fine fraction of sand are coal fly ash, carbonate (limestone, dolomite) sand as rock waste left in quarries, which use blasting for producing coarse aggregates.
It will ultimately depend on the intended use for the concrete. Certainly there are many potential alternatives. We have looked at using waste products such as quarry dust, municipal incinerator waste ash and waste iron - each with their own pros and cons.
Manufactured sand can be used in place of Sand provided quality of the manufactured sand meets the requirements.
Copper slag, blast furnace granulated slag, foundry sands may be an alternate solution for sand in concrete
Hmm maybe sea sand...very fine size n easily to get in plentiful amount...
sea sand is not recommended especially when the concrete will be reinforced with steel because it contains Cl.
slags are very usefull but you will have to take into account that it will be dimensionally stable. Sometimes slags contain free lime from calcination of calcium carbonate and this material increases significantly its volume with presenence of water . A concrete (rigid material) with active lime inside will self-destruct.
Manufactured sand blended with natural sand in the ratio of 70:30 can be used as fine aggregate in concrete, which shows the better performance than conventional concrete. If the sand is replaced with 100% manufactured sand, it performs as like conventional concrete. Fly ash also can be used as fine aggregate.
Sand "fine aggregates" are the most important integral part in the mortar, however, now-a-days we replace that by "Cintered Gypsum", and "Synthetic Flyash Crystals". Sometime construction debris can be used after dressing...!
alternative of sand can be extraction of crushing rocks, or quarry as limestone, basalt etc. If you can then you can also crush the dismantled structure and remold it for the alternative
Prima di risponderLe dovrei capire perché questa necessità di dover sostituire la sabbia; forse per creare un "prodotto" eco-compatibile" per l'ambiente?
Qualora fosse per una mancanza di reperibilità della sabbia (come ad esempio scarsa disponibilità in loco) se ne potrebbe parlare. Se invece è per creare un prodotto "eco"(ecologico) la letteratura è piena di alternative alla sabbia.
In tutti i casi la prego di NON usare sabbia di mare come suggerito da un utente
1) per i problemi che la sabbia di mare comporterebbe durante la fase di miscelazione(sali disciolti in essa etc...) e resa del calcestruzzo -non oso pensare al danno-.
2) perché non sarebbe "eco" per i tanti trattamenti che dovrebbe subire il prodotto (la sabbia) per essere adoperato per le sue esigenze.
CORDIALMENTE
-G.nni-
You can also use crushed glass as a substitute for sand. Just take care about the alkali-silica reaction using a mitigator addition, such as a metakaolin, etc. or even glass powder itself.
I think Recycled sands from construction and demolition waste are useful. But almost investigations show that we should use under 20-30% replacing to natural sand for structure concrete, but in mortar and non-structure concrete is ok, we can use 100% recycled sand specially recycled concrete sand.
Other sand: bottom fly ash, granulated slags are beneficially used as alternative fine aggregates of sand in concrete
You Can use Vermiculate, Pumice, Copper Slag and Crushed rubber for replacement of sand
sand- natural and artificial or crushed sand, natural sand is replaced by artificial sand. we can not completely replace artificial sand, research is on to find suitable material which can partly replace artificial sand. while using artificial sand care must be taken for dust and particles of size less than 300 micron should be within limit
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