Measuring and testing – Instrument mechanism or transmission – Rate of change
Patent
1992-08-11
1993-05-11
Noland, Tom
Measuring and testing
Instrument mechanism or transmission
Rate of change
73 61690, G01N 1506
Patent
active
052091309
ABSTRACT:
The present invention relates to a method and a system for recycling wash residue of ready mixed concrete include the steps of condensing used cement sludge to a predetermined concentration, storing the condensed sludge, sampling the stored sludge and determining the unhydration ratio of cement contained in the sludge, and weighing the stored sludge based on the determined unhydration ratio of cement in order to prepare a new batch of ready mixed concrete or motar. By determining the unhydration ratio of cement contained in the sludge which has been condensed to a predetermined concentration, it becomes possible to accurately know the ratio of cement contributing as cement and its ratio contributing as the aggregate in a new batch of ready mixed concrete. A new batch of ready mixed concrete can be prepared by weighing the amount of the sludge on the basis of the determined unhydration ratio. The ready mixed concrete thus prepared will have a desired hardening strength and drying shrinkage.
REFERENCES:
patent: 3499328 (1970-03-01), Kenny et al.
patent: 4144762 (1979-03-01), Duxbury
patent: 4615215 (1986-10-01), Sugimoto et al.
patent: 4741201 (1988-05-01), Propst
Iwase Fumio
Nakanishi Yoshihisa
Ohsaki Yukio
Neotec Co., Ltd.
Noland Tom
Roskos Joseph W.
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