冻融环境下泡沫混凝土的孔结构与力学性能

高志涵; 陈波; 陈家林; 袁志颖

doi:10.13801/j.cnki.fhclxb.20230608.001

冻融环境下泡沫混凝土的孔结构与力学性能

doi: 10.13801/j.cnki.fhclxb.20230608.001

高志涵^{1, 2},
陈波^{1, 2, ,},
陈家林^{1, 2},
袁志颖^{1, 2}

1.
河海大学　水利水电学院，南京 210098
2.
河海大学　水文水资源与水利工程科学国家重点实验室，南京 210098

基金项目: 国家自然科学基金面上项目(52079049)；国家自然科学基金重点项目(51739003)；国家重点实验室基本科研业务费(522012272)

详细信息

通讯作者:
陈波，博士，教授，博士生导师，研究方向为水工混凝土新材料　E-mail: chenbo@hhu.edu.cn

中图分类号: TU528.44；TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2023-04-24
- 修回日期: 2023-05-31
- 录用日期: 2023-06-03
- 网络出版日期: 2023-06-09
- 刊出日期: 2024-02-01

Pore structure and mechanical properties of foam concrete under freeze-thaw environment

GAO Zhihan^{1, 2},
CHEN Bo^{1, 2
, ,},
CHEN Jialin^{1, 2},
YUAN Zhiying^{1, 2}

1.
College of Water-conservancy and Hydropower, Hohai University, Nanjing 210098, China
2.
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China

Funds: General Program of National Natural Science Foundation of China (52079049); Key Program of National Natural Science Foundation of China (51739003); Basic Scientific Research Business Expenses of National Key Laboratories (522012272)

摘要

摘要: 对4种不同密度的泡沫混凝土试样进行了冻融循环试验，借助X-CT设备扫描了泡沫混凝土的孔隙结构，并使用声发射装置测试了泡沫混凝土单轴压缩过程中的声发射特征。结果表明：泡沫混凝土在单轴压缩过程中的应力-应变关系曲线具有明显的阶段性，单轴压缩过程中的声发射事件主要集中在接触期和陡增期。冻融循环后，泡沫混凝土的孔隙率和平均孔隙直径均增大，孔径分布更离散，孔隙壁厚度不断减小，引起力学性能的下降；冻融循环降低了试样的脆性，使其声发射累计振铃计数曲线更光滑，信号的活跃度随冻融次数的增加而降低；密度为1000 kg/m³的试样在冻融循环100次后，其大部分孔径在1000 μm以下，抗压强度只降低了23.7%，具有良好的抵抗冻融侵蚀的能力。
- 泡沫混凝土 /
- 冻融循环 /
- 单轴压缩 /
- 声发射 /
- 孔隙结构
Abstract: The freeze-thaw tests of four kinds of foam concrete samples with different density were carried out. The pore structure of foam concrete was scanned with X-CT equipment, and the acoustic emission characteristics of foam concrete during uniaxial compression were tested by acoustic emission device. The results show that obvious stages exist in the process of uniaxial compression test and the acoustic emission events in the process of uniaxial compression are mainly concentrated in the contact period and steep growth period. After freeze-thaw cycles, the porosity and average pore diameter of foam concrete increase, the pore size distribution is more discrete, and the thickness of pore wall decreases, which leads to the decrease of mechanical properties. The freeze-thaw cycle reduces the brittleness of the samples, and the cumulative ring count curve of acoustic emission is smoother. Besides, the signal activity decreases with the increase of freeze-thaw times. After 100 freeze-thaw cycles, most of the pore size of the sample with 1000 kg/m³ density is less than 1000 μm, and the compressive strength is only reduced by 23.7%. It has a good ability to resist freeze-thaw erosion.
- foam concrete /
- freeze-thaw cycles /
- uniaxial compression /
- acoustic emission /
- pore structure

HTML全文

图 1 试验仪器示意图

AE-MTS—Acoustic emission-uniaxial compression

Figure 1. Schematic diagram of test instrument

下载: 全尺寸图片幻灯片

图 2 各密度泡沫混凝土的应力-应变关系曲线

Figure 2. Stress-strain curves of foam concrete with different densities

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图 3 泡沫混凝土的受压特征图

Figure 3. Compression characteristic of foam concrete

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图 4 A06与A10的声发射特征

F-T—Freeze-thaw

Figure 4. Acoustic emission characteristics of A06 and A10

下载: 全尺寸图片幻灯片

图 5 冻融循环后泡沫混凝土的三维扫描图

Figure 5. Three-dimensional scanning map of foam concrete after freeze-thaw cycle

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图 6 两试样在冻融循环前后的孔隙网络模型

Figure 6. Pore network models of two samples before and after freeze-thaw cycle

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图 7 A06与A10试样的孔隙分布特征

Figure 7. Pore distribution characteristics of A06 and A10 samples

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表 1 泡沫混凝土的配合比及实测特征值

Table 1. Mixture proportion and measured characteristic value of foam concrete

Density level	Cement /(kg·m⁻³)	Foam /(kg·m⁻³)	Water /(kg·m⁻³)	Wet density /(kg·m⁻³)	Dry density /(kg·m⁻³)	Porosity /%
A05	364.0	36.85	218.4	619.0	524.6	68.8
A06	430.7	33.55	258.4	722.4	642.1	58.5
A08	564.1	26.40	338.5	929.2	853.8	52.5
A10	697.6	19.80	418.6	1136.0	1054.6	46.3

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表 2 各密度泡沫混凝土的声发射(AE)累计振铃计数

Table 2. Cumulative acoustic emission (AE) ringing count of foam concrete with different densities

Freeze-thaw cycle	A05	A06	A08	A10
0	66652	58324	21028	15946
25	49069	51653	16002	16021
50	35845	37752	15673	13875
75	27061	38847	14583	12601
100	31698	17542	12097	11792

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表 3 A06与A10试样的孔隙结构参数

Table 3. Pore structure parameters of A06 and A10 samples

Density level	Freeze-thaw cycle	Porosity /%	Pore number	Average pore wall thickness /μm	Pore diameter/μm
Density level	Freeze-thaw cycle	Porosity /%	Pore number	Average pore wall thickness /μm	Max.	Min.	Average
A06	0	58.5	117468	107	3157	41	907
	50	64.1	74341	92	3811	40	1262
	100	78.8	62159	74	5384	41	1403
A10	0	46.3	176610	248	1208	42	238
	50	52.8	125782	185	2105	41	355
	100	57.3	102647	154	2357	41	527
Notes: Limited by the resolution and testing accuracy of X-CT equipment, the minimum pore size calculated by three-dimensional reconstruction is about 40 μm; But in fact, the minimum pore size of foam concrete should be smaller than 40 μm and different from each other.

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