碳化湿度对碳化砌块力学与耐久性能的影响

doi:10.13229/j.cnki.jdxbgxb.20220341

吉林大学学报(工学版) ›› 2024, Vol. 54 ›› Issue (2): 445-452.doi: 10.13229/j.cnki.jdxbgxb.20220341

• 交通运输工程·土木工程 • 上一篇

碳化湿度对碳化砌块力学与耐久性能的影响

陈凯祥^1,²(),张鹤年^3,⁴(),席培胜³,王长丹^1,²,余涛⁵,张炳锌⁶

^1.同济大学道路与交通工程教育部重点实验室，上海 201804
^2.同济大学上海市轨道交通结构耐久与系统安全重点实验室，上海 201804
^3.安徽建筑大学安徽省城市建设和地下空间工程研究中心，合肥 230022
^4.中国科学院大学南京学院，南京 210007
^5.东北电力大学电气工程学院，吉林省吉林市 132011
^6.华能沁北发电有限责任公司，河南济源 454650

收稿日期:2022-03-30 出版日期:2024-02-01 发布日期:2024-03-29
通讯作者: 张鹤年 E-mail:1810510@tongji.edu.cn;zhanghn_001@163.com
作者简介:陈凯祥（1990-），男，博士研究生. 研究方向：新型建筑材料和新型路基结构.E-mail：1810510@tongji.edu.cn
基金资助:
江苏省自然科学基金项目(BY2014120);国家自然科学基金项目(51778485);国家自然科学基金青年基金项目(51608384)

Influence of carbonization humidity on mechanics and durability of carbonization block

Kai-xiang CHEN^1,²(),He-nian ZHANG^3,⁴(),Pei-sheng XI³,Chang-dan WANG^1,²,Tao YU⁵,Bing-xin ZHANG⁶

^1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education，Tongji University，Shanghai 201804，China
^2.Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety，Tongji University，Shanghai 201804，China
^3.Anhui Urban Construction and Underground Space Engineering Research Center，Anhui Jianzhu University，Hefei 230022，China
^4.University of Chinese Academy of Sciences Nanjing，Nanjing 210007，China
^5.School of Electrical Engineering，Northeast Electric Power University，Jilin 132011，China
^6.Huaneng Qinbei Power Generation Co. ，Ltd. ，Jiyuan 454650，China

Received:2022-03-30 Online:2024-02-01 Published:2024-03-29
Contact: He-nian ZHANG E-mail:1810510@tongji.edu.cn;zhanghn_001@163.com

摘要/Abstract

摘要：

碳化砌块是基于活性氧化镁水泥碳化技术研发的新型砌块，即先采用活性氧化镁水泥与骨料进行搅拌，然后利用CO₂进行碳化，以达到提高强度目的。通过室内试验，开展了无侧限抗压强度、X射线衍射、电镜扫描和热重分析试验，研究了碳化湿度对碳化砌块强度和碳化产物的影响，并进行耐久性测试。结果表明：碳化砌块强度明显高于普通水泥砌块，在碳化养护三天，碳化砌块能达到70%~80%强度，碳化湿度为60%的砌块强度最佳；碳化砌块具有很强的耐久性能，碳化湿度为60%碳化砌块耐久性能明显高于40%和80%的碳化砌块；活性氧化镁的碳化产物是碳酸镁石、水菱镁石和球碳镁石，碳化湿度为60%的碳化砌块内部碳化产物最密集。

关键词: 建筑材料, 碳化砌块, 碳化湿度, 抗压强度, 微观测试, 耐久性能

Abstract:

The carbonization block is a new type of block， which is developed on the basis of the carbonization method of reactive magnesium oxide （MgO） cement， in which the reactive MgO cement is firstly mixed with aggregates and then CO₂ is injected for carbonization to achieve the purpose of improving the strength. The indoor tests of unconfined compressive strength， X-ray diffraction， electron microscope scanning， and thermogravimetric analysis were employed to study the effect of carbonization humidity on the strength and carbonization products. The durability of carbonation block was tested to explore its engineering performance. The results show that the strength of carbonization block is higher than that of ordinary cement block. After 3 days of carbonization curing， the strength of carbonization block can reach 70%~80% of that during 28 days curing， and the strength of block with carbonization humidity of 60% is the best. Carbonation blocks have a strong durability and the durability of carbonated blocks with carbonation humidity of 60% is significantly higher than that of humidity 40% and 80%. The carbonization products of reactive magnesium oxide are magnesite carbonate， brucite and nodular magnesite. The carbonization products in the carbonized block with carbonization humidity 60% are the most dense.

Key words: building material, carbonization block, carbonization humidity, compressive strength, micro-structures, durability

中图分类号:

TU522.3

陈凯祥,张鹤年,席培胜,王长丹,余涛,张炳锌. 碳化湿度对碳化砌块力学与耐久性能的影响[J]. 吉林大学学报(工学版), 2024, 54(2): 445-452.

Kai-xiang CHEN,He-nian ZHANG,Pei-sheng XI,Chang-dan WANG,Tao YU,Bing-xin ZHANG. Influence of carbonization humidity on mechanics and durability of carbonization block[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(2): 445-452.

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原料	MgO	SiO₂	CaO	Al₂O₃	其他
氧化镁	93.00	3.91	1.50	0.10	1.49
水泥	1.16	27.40	48.80	11.50	11.14

项目	指标
比表面积/（m²·g^-1）	50.425
ACC值/s	29
活性含量/%	65.31
活性评价	高

湿度/%	m₁/g	m₂/g	K_m /%
40	358.8	356.5	0.64
60	361.2	359.1	0.58
80	364.3	362.1	0.60

湿度%	P₁/MPa	P₂/MPa	K_p /%
40	25.5	23.7	7.04
60	30.4	28.7	5.49
80	22.1	20.1	8.96

湿度/%	R/MPa	R_f/MPa	K_f
40	25.5	24.2	0.95
60	30.4	29.1	0.96
80	22.1	20.6	0.93

碳化湿度对碳化砌块力学与耐久性能的影响

Influence of carbonization humidity on mechanics and durability of carbonization block

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