Case studies of Advanced Construction and Demolition waste(CDW)
Recycling initiatives and technologies In JAPANAffiliation
Location
Position:
Name/Surname
e-mailTitle

HAZAMA ANDO CORPORATION
6-1-20, Akasaka, Minato-ku, Tokyo 107-8658, Japan
Manager, Technical Planning Department, Technical Division
HIROYUKI AKITA
akita.hiroyuki@ad-hzm.co.jp
Effective utilization technology of fly ash and coal ash
Prevention
Re-useTheme
classification〇

Technology
development stage〇

RecycleReduce Co2
LegacyBusiness to overseas
Etc.
Practical use
Scheduled to be put into practical use by 2020
Scheduled to be put into practical use after 2020

Specific content(1) Technology to harden coal ash
As a technology that can effectively utilize coal ash powderdischarged from a coal-fired power plant in large quantities,
we developed an “ash- crete” having a formulation that minimizes
unit water content without using aggregate.
The points of “ash- crete”technology are as follows① Efficiently express strength by compounding design with optimal
water content ratio as an indicator② “ash- crete” is manufactured using “superfluid construction
method” developed by our company. The“superfluid construction
method” is a unique construction method which compacts and mixes
powder mixed with very little amount of water by strong vibration③ For coal ash with large quality fluctuation, it is possible to quickly
select blending by simple flow test.

(2) Type of “ash- crete”① “ash- crete”
For manufacturing block of artificial seabed mountains② “ash- crete” TypeⅡ （ AC-Ⅱ ）For embankment / roadbed material of residential land
construction work, coast maintenance work etc.
③ “ash- crete” TypeS（ AC-S）
For general embankment materials
Appeal point- we have made effective use of over 1 million tons of coal ash, d ue
to the development of “ ash- crete” technology using coal ash powder.
We will continue to actively make effective use of fly ash and coalash and contribute to the reduction of co-fired by-products.

-24-Effective utilization technology of fly ash and coal ash“ ash- c rete” TypeS（ AC -S ）High-quality safe hardened body, “As h-crete,” whose
chief material is large amount of coal as h, “fly as h,”
generated from coal-fired power plants, is applicable
to mos t of marine block s tructures, s uch as artificial
submarine mountains , seaweed bed blocks , artificial
fish res ts , etc.
Ash-crete Type S is a product for construction ofembankment, which has been produced by utilizing
the manufacturing technology of this hardened body.
Its vers atility has been enhanced through crushing toenable its handling in a manner s imilar to the case ofordinary embankment materials.
“S” of AC-S stands for the followings :Shinchi (town),
Soma (City), andSafety.
Namely, this “S” indicates the key factor of development, that is, contribution through local
cons umption of locally produced coal as hes from the Shinchi Power Plant of Soma Kyodo PowerCompany, and the wis h for early recons truction of quake-damaged areas.

【 Usage and features of AC-S 】
Usage; Embankment, Underground Roadbed
Weight; 20% lighter than general embankments
Safety; Clear s oil environmental s tandard
Strengt h ; Co mpress ive s trengt h 10 to 15N/mm2
grain size ; 200 mm or less , Adjustable-25-【 Manufacturing process】】

Pr oduction of cur ed body

Pri mary crus hi ng

Secondar y cr ushi ng

Product shipment【 Construction example】】
AC-S has been employed for rehabilitation of the prefectural road, Soma Watari Route. With thesupply s tarted in J uly 2015, about 36,000 m3 of AC-S s upply is scheduled by March 2016.
Coal as hes , the effective res ources of the location of the coal-fired power plant, will be further
recycled in the future in the form of AC-S, thereby preventing nature destruction due toquarrying of natural embankment materials and contributing to the s urrounding regions.

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