every year 2.5 to 4.1million ㎥of returned ready-mixed concrete
Estimated QTY (1,000ton)
| 2015 | 2016 | 2017 | 2018 | 2019 | ||
| Ready-mixed Concrete annual delivery QTY | 87,061 | 83,912 | 83,701 | 85,481 | 81,959 | |
| estimated QTY of Returned Ready -mixed Concrete | 3% | 2,612 | 2,517 | 2,511 | 2,564 | 2,459 |
| 5% | 4,353 | 4,196 | 4,185 | 4,274 | 4,098 |
DATA : ZENNAMA HP
In Japan, the estimated quantity of returned ready-mixed concrete is 3 to 5% against total delivery, which indicats 2 to 4 times of Tokyo Dome Stadium. Even made by precious natural resources, the huge amount is wasted.
no standard about returned ready-mixed concrete
Where to happen Returned ready-mixed concrete?
<before unloading from concrete mixer truck>
Quality NG ？㎥
Mistake on order ？㎥
<after unloading from concrete mixer truck to pumper>
Leading mortar ０.５㎥
inside pumper hopper ０.３㎥
inside pumper pipe ？
total ０.８＋α㎥
in case of pumper, there must be 0.8㎥ of returned returned-mixed concrete
There is no definition, regulation, processing method and cost estimation on any standard such as JIS, JASS5 etc