CO2养护压力对植生混凝土碱度及力学性能的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (10): 3499-3507.

CO₂养护压力对植生混凝土碱度及力学性能的影响

张瑞¹, 杨大伟², 吴科², 王跃锋², 陈晓强¹, 刘来宝³, 张礼华³, 刘川北³, 辜涛^3,4

1.西南科技大学土木工程与建筑学院,绵阳 621010;
2.中铁九局集团第五工程有限公司,成都 611730;
3.西南科技大学材料与化学学院,绵阳 621010;
4.绿色建筑材料国家重点实验室,北京 100024

收稿日期:2023-06-02 修订日期:2023-07-24 出版日期:2023-10-15 发布日期:2023-10-17
通信作者: 辜涛,博士,讲师。E-mail:gutao2021@swust.edu.cn
作者简介:张瑞(1998—),男,硕士研究生。主要从事混凝土技术的研究。E-mail:446487957@qq.com
基金资助:
绿色建筑材料国家重点实验室开放基金课题(2022GBM08);国家自然科学基金(52178254);四川省自然科学基金青年基金(2023NSFSC0931);四川省重点研发项目(2023YFS0360);中铁九局集团第二工程有限公司科研项目(2022年宜威第2号);西南科技大学博士基金(22zx7131)

Effect of CO₂ Curing Pressure on Alkalinity and Mechanical Properties of Vegetated Concrete

ZHANG Rui¹, YANG Dawei², WU Ke², WANG Yuefeng², CHEN Xiaoqiang¹, LIU Laibao³, ZHANG Lihua³, LIU Chuanbei³, GU Tao^3,4

1. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China;
2. China Railway Ninth Bureau Group Fifth Engineering Co., Ltd., Chengdu 611730, China;
3. School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, China;
4. State Key Laboratory of Green Building Materials, Beijing 100024, China

Received:2023-06-02 Revised:2023-07-24 Online:2023-10-15 Published:2023-10-17

摘要/Abstract

摘要： 本文研究了植生混凝土的碱度及力学性能随CO₂养护压力的变化规律,并结合X射线衍射定量相分析(XRD-QPA)、热重分析(TGA)及扫描电子显微镜(SEM)等方法,探讨了CO₂养护压力对反应速率及产物生成的影响。结果表明:增大CO₂养护压力可提高硅酸三钙(C₃S)、硅酸二钙(C₂S)及氢氧化钙(CH)的碳化速率,同时可快速生成碳化致密层,有利于延缓CH的生成与溶出;碳化反应生成的碳酸钙(CaCO₃)及水化硅酸钙(C-S-H)凝胶增大了水泥石密实度,可有效提升植生混凝土的抗压强度。与常压CO₂养护相比,在CO₂养护压力为0.3 MPa的条件下养护1 h,植生混凝土3 d抗压强度提高了72.8%,28 d抗压强度提高了4.8%,28 d的pH值由11.4降低至8.2。适度提高CO₂养护压力对植生混凝土降碱和增强效果良好。

关键词: 植生混凝土, 降碱, CO₂养护压力, 碳化致密层, 抗压强度

Abstract: In this paper, the variation laws of alkalinity and mechanical properties of vegetated concrete with CO₂ curing pressure were investigated, and the effect of CO₂ curing pressure on the reaction rate and product generation was discussed by combining X-ray diffraction quantitative phase analysis (XRD-QPA), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The results show that increasing the CO₂ curing pressure can improve the carbonation rate of tricalcium silicate (C₃S), dicalcium silicate (C₂S) and calcium hydroxide (CH). At the same time, the carbonized dense layer can be generated rapidly, which is conducive to delaying the generation and leaching of CH. The calcium carbonate (CaCO₃) and hydrated calcium silicate (C-S-H) gel generated by the carbonation reaction increase the cement stone compactness and effectively improve the compressive strength of vegetated concrete. Compared with normal pressure CO₂ curing, the 3 d compressive strength of vegetated concrete cured under CO₂ curing pressure of 0.3 MPa for 1 h increases by 72.8%, the 28 d compressive strength increases by 4.8%, and the 28 d pH value decreases from 11.4 to 8.2. Moderately increasing the CO₂ curing pressure is effective in reducing the alkalinity and increasing the strength of vegetated concrete.

Key words: vegetated concrete, alkalinity reduction, CO₂ curing pressure, carbonaized dense layer, compressive strength

中图分类号:

TU528

张瑞, 杨大伟, 吴科, 王跃锋, 陈晓强, 刘来宝, 张礼华, 刘川北, 辜涛. CO₂养护压力对植生混凝土碱度及力学性能的影响[J]. 硅酸盐通报, 2023, 42(10): 3499-3507.

ZHANG Rui, YANG Dawei, WU Ke, WANG Yuefeng, CHEN Xiaoqiang, LIU Laibao, ZHANG Lihua, LIU Chuanbei, GU Tao. Effect of CO₂ Curing Pressure on Alkalinity and Mechanical Properties of Vegetated Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3499-3507.

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CO₂养护压力对植生混凝土碱度及力学性能的影响

Effect of CO₂ Curing Pressure on Alkalinity and Mechanical Properties of Vegetated Concrete

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