Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (2): 445-452.doi: 10.13229/j.cnki.jdxbgxb.20220341

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Influence of carbonization humidity on mechanics and durability of carbonization block

Kai-xiang CHEN1,2(),He-nian ZHANG3,4(),Pei-sheng XI3,Chang-dan WANG1,2,Tao YU5,Bing-xin ZHANG6   

  1. 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

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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

CLC Number: 

  • TU522.3

Table 1

Chemical composition （by mass） of reactive MgO and portland cement"

原料MgOSiO2CaOAl2O3其他
氧化镁93.003.911.500.101.49
水泥1.1627.4048.8011.5011.14

Table 2

Test results of MgO activity"

项目指标
比表面积/（m2·g-1）50.425
ACC值/s29
活性含量/%65.31
活性评价高

Fig.1

Effect of carbonization humidity on compressive strength of carbonization block"

Fig.2

XRD of different carbonization humidity"

Fig.3

SEM images of RH 60%"

Fig.4

DTG pictures of 5 kinds of carbonization humidity"

Table 3

Mass loss rate of carbonized blocks after freeze-thaw"

湿度/%m1 /gm2 /gKm /%
40358.8356.50.64
60361.2359.10.58
80364.3362.10.60

Table 4

Compressive strength loss rate of carbonization blocks after freeze-thaw"

湿度%P1 /MPaP2 /MPaKp /%
4025.523.77.04
6030.428.75.49
8022.120.18.96

Table 5

Softening coefficient of carbonized block"

湿度/%R/MPaRf/MPaKf
4025.524.20.95
6030.429.10.96
8022.120.60.93

Fig.5

Drying shrinkage quality and height of carbonized block"

Table 6

Economic and environmental indicators"

原料

价格/

（元·t-1）

能耗/ （MJ·t-1）CO2 排放/（t·t-1）不可再生资源消耗/（t·t-1）
PC300~45050000.951.50
MgO245~367.525950.821.25
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