玉米秸秆灰柠檬酸改性处理对水泥基材料主要理化性能的影响

范炜; 刘国超; 陈龙辉; 王德辉

玉米秸秆灰柠檬酸改性处理对水泥基材料主要理化性能的影响

范炜^{1, 2},
刘国超²,
陈龙辉³,
王德辉^2, ,

1.
福建江夏学院　新型高性能混凝土材料与结构福建省高校工程研究中心，福州 350108
2.
福州大学　土木工程学院，福州 350108
3.
福建筑兆建设有限公司，厦门 361000

基金项目: 国家自基金青年科学基金项目(51608187); 福建省自然科学基金项目(2020J01941); 新型高性能混凝土材料与结构福建省高校工程研究中心开放基金(JXKFA202202); 福建省住房和城乡建设厅科技研究开发计划项目(2022-K-196)

详细信息

通讯作者:
王德辉，博士，副教授，硕士生导师，研究方向为高性能混凝土　E-mail: dhwang@fzu.edu.cn

中图分类号: TU528；TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2024-01-08
- 修回日期: 2024-03-04
- 录用日期: 2024-03-10
- 网络出版日期: 2024-04-16

Effects if corn straw ash citric acid modification treatment on the main physicochemical properties of cement-based materials

FAN Wei^{1, 2},
LIU Guochao²,
CHEN Longhui³,
WANG Dehui^{2
, ,}

1.
Fujian University Engineering Research Center for New High Performance Concrete Materials and Structures, Fujian Jiangxia University, Fuzhou 350108, China
2.
College of Civil Engineering, Fuzhou University, Fuzhou 350108, China
3.
Fujian Zhuzhao Construction CO., LTD, Xiamen 361000, China

Funds: This work was financially supported by Youth Fund of the National Natural Science Foundation of China (51608187); the Natural Science Foundation of Fujian Province (2020J01941); the Open Fund Project of Fujian University Engineering Research Center for New High Performance Concrete Materials and Structures (JXKFA202202); science and technology research and development plan project of housing and urban-rural development of Fujian Province (2022-K-196).

摘要

摘要: 中国是农业大国，每年都会产生大量的玉米秸秆，亟需提高其综合利用率。玉米秸秆焚烧后的残渣具有潜在的火山灰活性，可望改善混凝土的性能。然而，玉米秸秆灰含有一定的杂质，不利于混凝土的相关性能，需要进行改性处理。为了减少杂质的影响，对玉米秸秆灰进行柠檬酸浸泡处理，对比分析了原状玉米秸秆灰和酸浸玉米秸秆灰在水泥基材料中的作用机制。结果表明：采用柠檬酸改性技术可以有效地减少玉米秸秆灰中的杂质，并能够提高水泥基材料的强度。随着玉米秸秆灰掺量的增加，试样基体的水化硅酸钙峰值面积先增大后降低，而界面过渡区处水化硅酸钙的Ca/Si比值则先减小后增大。同时，试样的孔隙率不断增大，抗压强度则先增大后降低。当玉米秸秆灰掺量为15wt%时，水泥基材料的强度达到最大。与掺入原状玉米秸秆灰的试样相比，掺入酸浸玉米秸秆灰试样基体的水化硅酸钙峰值面积更大，而界面过渡区处水化硅酸钙的Ca/Si比值下降了15.25%-26.72%。另外，试样的最可几孔径更小，抗压强度提高了2.53%-12.86%。本研究可降低玉米秸秆灰杂质对混凝土相关性能的不利影响，并为玉米秸秆灰在混凝土中的应用提供了理论基础。
- 农业废弃物处理 /
- 玉米秸秆灰 /
- 柠檬酸 /
- 微观结构 /
- 抗压强度
Abstract: China is a major agricultural country that produces a large amount of corn straw every year, and there is an urgent need to improve its comprehensive utilization rate. The residue of corn straw incineration has potential volcanic ash activity and is expected to improve the performance of concrete. However, corn straw ash contains certain impurities, which are not conducive to the relevant performance of concrete and require modification treatment. In order to reduce the influence of impurities, corn straw ash was subjected to citric acid soaking treatment, and the action mechanism of original corn straw ash (OCSA) and acid-soaked corn straw ash (ACSA) in cement-based materials was compared and analyzed. The results show that the use of citric acid modification technology can effectively reduce impurities in corn straw ash and improve the strength of cement-based materials. As the content of corn straw ash increases, the peak area of hydrated calcium silicate in matrix of sample first increases and then decreases, while the Ca/Si ratio of hydrated calcium silicate at the interfacial transition zone first decreases and then increases. At the same time, the porosity of samples continues to increase, and the compressive strength first increases and then decreases. When the content of corn straw ash is 15wt%, the compressive strength of samples reaches its maximum. Compared with samples with OCSA, samples with ACSA have a higher peak area of hydrated calcium silicate in the matrix, and the Ca/Si ratio of hydrated calcium silicate at interfacial transition zone reduces by 15.25%-26.72%. In addition, the most probable pore diameter of samples is finer, and the compressive strength increases by 2.53%-12.86%. This research can reduce the adverse effects of impurities in corn straw ash on the relative properties of concrete, and provides a theoretical basis for the application of corn straw ash in concrete.
- Agricultural waste treatment /
- Corn straw ash /
- Citric acid /
- Microstructure /
- Compressive strength

HTML全文

图 1 掺玉米秸秆灰胶砂的红外光谱：(a)原状玉米秸秆灰；(b)原状玉米秸秆灰在972 cm⁻¹处的放大图；(c)酸浸玉米秸秆灰；(d)酸浸玉米秸秆灰在972 cm⁻¹处的放大图

Figure 1. Infrared spectrum of mortars with corn straw ash: (a) original corn straw ash; (b) enlarged in original corn straw ash figure at 972 cm⁻¹; (c) acid-soaked corn straw ash; (d) enlarged in acid-soaked corn straw ash figure at 972 cm⁻¹

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图 2 掺玉米秸秆灰胶砂的拉曼光谱：(a)原状玉米秸秆灰；(b)酸浸玉米秸秆灰

Figure 2. Raman spectra of mortars with corn straw ash: (a) original corn straw ash; (b) acid-soaked corn straw ash

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图 3 玉米秸秆灰对胶砂孔结构的影响：(a)原状玉米秸秆灰；(b)酸浸玉米秸秆灰

Figure 3. Effects of corn straw ash on the pore structure of mortars: (a) original corn straw ash; (b) acid-soaked corn straw ash

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图 4 掺玉米秸秆灰胶砂中骨料界面过渡区SEM图：(a) 10wt% OCSA，×3000倍；(b) 15wt% OCSA，×3000倍；(c) 20wt% OCSA，×3000倍；(d) 25wt% OCSA，×3000倍；(e) 30wt% OCSA，×3000倍；(f) 10wt% ACSA，×3000倍；(g) 15wt% ACSA，×3000倍；(h) 20wt% ACSA，×3000倍；(i) 25wt% ACSA，×3000倍；(j) 30wt% ACSA，×3000倍

Figure 4. SEM of interfacial transition zone of aggregate in mortars with corn straw ash: (a) 10wt% OCSA, ×3000; (b) 15wt% OCSA, ×3000; (c) 20wt% OCSA, ×3000; (d) 25wt% OCSA, ×3000; (e) 30wt% OCSA, ×3000; (f) 10wt% ACSA, ×3000; (g) 15wt% ACSA, ×3000; (h) 20wt% ACSA, ×3000; (i) 25wt% ACSA, ×3000; (j) 30wt% ACSA, ×3000

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图 5 掺玉米秸秆灰胶砂中骨料界面过渡区EDX图：(a) 10wt%OCSA；(b) 15wt% OCSA；(c) 20wt% OCSA；(d) 25wt% OCSA；(e) 30wt% OCSA；(f) 10wt%ACSA；(g) 15wt%ACSA；(h) 20wt%ACSA；(i) 25wt%ACSA；(j) 30wt%ACSA

Figure 5. EDX of interfacial transition zone of aggregate in mortars with corn straw ash: (a) 10wt%OCSA; (b) 15wt% OCSA; (c) 20wt% OCSA; (d) 25wt% OCSA; (e) 30wt% OCSA; (f) 10wt%ACSA; (g) 15wt%ACSA; (h) 20wt%ACSA; (i) 25wt%ACSA; (j) 30wt%ACSA

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图 6 掺玉米秸秆灰胶砂界面过渡区处C-S-H的能谱分析图：(a)原状玉米秸秆灰；(b)酸浸玉米秸秆灰

Figure 6. EDX of C-S-H at interfacial transition zone of mortars with corn straw ash: (a) original corn straw ash; (b) acid-soaked corn straw ash

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图 7 掺玉米秸秆灰胶砂的抗压强度：(a) 原状玉米秸秆灰；(b) 酸浸玉米秸秆灰

Figure 7. Compressive strength of mortars with corn straw ash: (a) original corn straw ash; (b) acid-soaked corn straw ash

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表 1 水泥和玉米秸秆灰的主要化学成分(wt.%)

Table 1. Chemical compositions of cement and corn straw ash (wt.%)

	CaO	SiO₂	Al₂O₃	K₂O	Fe₂O₃	P₂O₅	Cl	MgO	SO₃	Na₂O	LOI
Cement	64.38	21.51	5.08	-	3.74	-	-	2.48	0.52	0.53	1.80
Corn straw ash	2.07	57.73	7.90	13.24	5.25	2.79	2.81	1.29	1.20	0.74	4.98
Acid-soaked corn straw ash	0.2	88.66	5.32	0.2	1.31	0.91	-	-	0.8	0.1	2.5

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表 2 掺玉米秸秆灰胶砂的原材料组成

Table 2. Raw materials composition of mortars with corn straw ash

	Sample	Cement/g	Corn straw ash/g	Sand/g	Water/g
Control	0wt%OCSA	450	0	1350	225
Origin corn straw ash(OCSA)	10wt%OCSA	405	45	1350	225
	15wt%OCSA	382.5	67.5	1350	225
	20wt%OCSA	360	90	1350	225
	25wt%OCSA	337.5	112.5	1350	225
	30wt%OCSA	315	135	1350	225
Acid corn straw ash(ACSA)	10wt%ACSA	405	45	1350	225
	15wt%ACSA	382.5	67.5	1350	225
	20wt%ACSA	360	90	1350	225
	25wt%ACSA	337.5	112.5	1350	225
	30wt%ACSA	315	135	1350	225

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表 3 掺玉米秸秆灰胶砂的孔结构特征

Table 3. Pore structure parameter of mortars with corn straw ash

Sample	Total porosity/%	Most probable pore size/nm
10wt%OCSA	10.15	9.96
15wt%OCSA	12.12	9.16
20wt%OCSA	12.39	9.67
25wt%OCSA	12.56	13.1
30wt%OCSA	13.21	13.54
10wt%ACSA	10.94	7.64
15wt%ACSA	11.09	7.12
20wt%ACSA	11.49	7.14
25wt%ACSA	12.37	9.79
30wt%ACSA	14.43	9.91

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