钙质促凝剂对固化高含水率工程废浆强度的影响

硅酸盐通报 ›› 2020, Vol. 39 ›› Issue (12): 3945-3951.

钙质促凝剂对固化高含水率工程废浆强度的影响

宋苗苗¹, 朱鹏², 徐桂中¹, 王凤珍³, 唐鹏⁴

1.盐城工学院土木工程学院,盐城 224051;
2.安徽理工大学土木建筑学院,淮南 232001;
3.江苏荣泰建设集团有限公司,盐城 224000;
4.江苏科技大学土木工程与建筑学院,镇江 212003

发布日期:2021-02-01
通讯作者: 徐桂中,博士,副教授。E-mail:guizhongxu@163.com
作者简介:宋苗苗(1987—),女,博士,讲师。主要从事软土地基处理,疏浚泥和工程废浆处置及资源化利用等方面的研究。E-mail:songmiaomiao12@126.com
基金资助:
国家自然科学基金(51978597,51778556);江苏省产学研合作项目(BY2019254)

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

SONG Miaomiao¹, ZHU Peng², XU Guizhong¹, WANG Fengzhen³, TANG Peng⁴

1. School of Civil Engineering, Yancheng Institute of Technology, Yancheng 224051, China;
2. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China;
3. Jiangsu Rongtai Construction Group Co., Ltd., Yancheng 224000, China;
4. School of Architecture and Civil Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China

Published:2021-02-01

摘要/Abstract

摘要： 为明确钙质促凝剂添加对固化高含水率工程废浆强度性状的影响,对含钙质促凝剂的固化工程废浆开展一系列无侧限抗压试验,研究不同促凝剂性质及掺量下固化工程废浆强度性状的变化。结果表明:加入钙质促凝剂将显著增强固化工程废浆的无侧限抗压强度q_u,适宜的促凝剂掺量可将固化工程废浆的强度提高1倍左右;不同养护龄期下固化工程废浆的q_u随CaCl₂掺量的增加先增大后降低,随Ca(OH)₂掺量的增大则表现出先增大后减小再增大的变化趋势。和CaCl₂相比,添加Ca(OH)₂引起固化工程废浆强度的增加相对较小。此外,固化工程废浆的破坏应变ε_f和变形系数E50随促凝剂性质和掺量不同也是变化的。对于研究所用工程废浆和促凝剂,固化处理后土体的E50≈(30~100)q_u。

关键词: 工程废浆, 高含水率, 钙质促凝剂, 无侧限抗压强度, 变形系数

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

中图分类号:

TU44

宋苗苗, 朱鹏, 徐桂中, 王凤珍, 唐鹏. 钙质促凝剂对固化高含水率工程废浆强度的影响[J]. 硅酸盐通报, 2020, 39(12): 3945-3951.

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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