Abstract
The exceeding concrete and washing equipment water are a matter to solve in concrete production. This paper explains several possibilities for recycling and analyses the products obtained with one recycling equipment. The objective of this work is to study the possibility to increase the percentage of recycling in new mixes. The developed study relates wash water density and fine particles content. Besides, mortar and concrete samples were tested introducing different quantities of these fine particles, substituting cement, sand or only as an addition. Consistency, compressive strength, setting time, absorption, and capillarity were tested. The results indicated an improvement of the studied properties in some percentages when substituting sand. It confirms the possibility to introduce larger quantities of wash water in new concrete mixes, with corrections in sand quantity depending on water density.
Highlights
The concrete mixing plant generates different solid waste, fresh concrete residue or in water suspension, during the production process of concrete mixes. This waste mainly comes from fresh concrete exceeding and equipment washing
The most different ones corresponded to the days in which the mixing plant was producing much more mortar than concrete, and the sand content was higher
The valuation and recycling of waste from exceeding concrete mixes and washing of mixing and transport machinery is possible and necessary. The use of these recycled products in new concrete mixes needs the study of characteristics variation for the correct implementation
Summary
The concrete mixing plant generates different solid waste, fresh concrete residue or in water suspension, during the production process of concrete mixes. This waste mainly comes from fresh concrete exceeding and equipment washing. Concrete waste comes from exceeding mixes, rejections due to deficient supply, testing mixes, etc. Water consumption is very high in these installations. Equipment and machinery washing can reach to over 30% of the total water consumption [1]
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