US 12,252,440 B2
Recycled concrete aggregates and heavy oil fuel ash for green controlled low strength material
Zakariya Saleh Al-Helal, Dhahran (SA); Muhammad Kalimur Rahman, Dhahran (SA); Carlos Ernesto Acero, Dhahran (SA); Mohammed Ibrahim, Dhahran (SA); and Luai M. Alhems, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA); and King Fahd University of Petroleum & Minerals, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA); and King Fahd University of Petroleum & Minerals, Dhahran (SA)
Filed on Jul. 11, 2022, as Appl. No. 17/862,198.
Application 17/862,198 is a continuation in part of application No. 16/815,805, filed on Mar. 11, 2020, granted, now 11,434,168.
Claims priority of provisional application 62/816,602, filed on Mar. 11, 2019.
Prior Publication US 2022/0340490 A1, Oct. 27, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C04B 18/167 (2023.01); C04B 18/06 (2006.01)
CPC C04B 18/167 (2013.01) [C04B 18/06 (2013.01)] 18 Claims
 
1. A controlled low strength material, constituents of the controlled low strength material including:
a cement, the cement in an amount of 2 wt % to 5 wt % of the constituents of the controlled low strength material;
a heavy oil fuel ash in an amount of 10 wt % to 50 wt % of the sum of the cement and the heavy oil fuel ash;
an aggregate, where the aggregate includes concrete demolition waste, the aggregate in an amount of 20 wt % to 95 wt % of the constituents of the controlled low strength material; and
a water, the water in an amount of 10 wt % to 20 wt % of the constituents of the controlled low strength material; where
the controlled low strength material has a compressive strength that does not exceed 8.3 MPa, measured at 28 days.