Effects of Calcareous Flocculants on Strength of Cemented Construction Waste Slurry with High Water Content

Abstract

Abstract: In this study, a series of unconfined compression tests were conducted to investigate calcareous flocculant effects on strength behavior of cemented construction waste slurry with high water content containing calcareous flocculants. Changes in strength behavior of cemented waste slurry under different properties and dosage of accelerator were studied. For cemented waste slurry, calcareous flocculants significantly enhance its unconfined compressive strength (q_u), and about onefold increase in the q_u is found at the appropriate content of flocculants. The q_u of cemented slurry at different curing time increases firstly and then decreases with increase in the CaCl₂ content. While for the cemented slurry with Ca(OH)₂, its q_u increases at first, then decreases before the last increase with the increasing Ca(OH)₂ content. Compared with the CaCl₂, the increase in the q_u caused by adding Ca(OH)₂ is relatively smaller at the same content. In addition, the failure strain ε_f and deformation coefficient E50 of cemented slurry vary with flocculant type and content. For cemented construction waste slurry with calcareous flocculants, the equation (E50≈(30~100)q_u) is used to predict the value of E50.

Key words: construction waste slurry, high water content, calcareous flocculant, unconfined compressive strength, deformation coefficient

CLC Number:

TU44

SONG Miaomiao, ZHU Peng, XU Guizhong, WANG Fengzhen, TANG Peng. Effects of Calcareous Flocculants on Strength of Cemented Construction Waste Slurry with High Water Content[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3945-3951.

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