珊瑚废弃物对水泥砂浆强度和体积稳定性的影响

倪雅倩; 何智海; 石锦炎; 贺一烽; 刘宝举

珊瑚废弃物对水泥砂浆强度和体积稳定性的影响

倪雅倩^{1, 2, 3},
何智海^{1, 2, 3, ,},
石锦炎⁴,
贺一烽^{1, 2, 3},
刘宝举^{4, 5}

1.
绍兴文理学院　土木工程学院, 绍兴 312000
2.
浙江省岩石力学与地质灾害重点实验室, 绍兴 312000
3.
绍兴文理学院　历史文化名城传承发展研究中心, 绍兴 312000
4.
中南大学　土木工程学院, 长沙 410075
5.
高速铁路建造技术国家工程研究中心, 长沙 410075

基金项目: 国家自然科学基金项目(51602198)；浙江省自然科学基金(LY20E020006)；中国中铁股份有限公司科技研究开发计划项目(2021-重点-08)

详细信息

通讯作者:
何智海，博士后，副教授，研究方向为水泥基材料　E-mail：hezhihai@usx.edu.cn

中图分类号: TU528;TB333
计量
- 文章访问数: 49
- HTML全文浏览量: 28
- 被引次数: 0
出版历程
- 收稿日期: 2023-03-24
- 修回日期: 2023-04-14
- 录用日期: 2023-04-25
- 网络出版日期: 2023-05-12

Influence of coral waste on the strength and volume stability of cement mortar

Yaqian NI^{1, 2, 3},
Zhihai HE^{1, 2, 3
, ,},
Jinyan SHI⁴,
Yifeng HE^{1, 2, 3},
Baoju LIU^{4, 5}

1.
College of Civil Engineering, Shaoxing University, Shaoxing 312000, China
2.
Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, Shaoxing 312000, China
3.
Historical and Cultural City Research Center, Shaoxing University, Shaoxing 312000, China
4.
School of Civil Engineering, Central South University, Changsha 410075, China
5.
National Engineering Research Center of High-speed Railway Construction Technology, Changsha 410075, China

Funds: National Natural Science Foundation of China (51602198)；Natural Science Foundation of Zhejiang Province (LY20E020006)；Science and Technology Research and Development Program Project of China Railway Group Limited (2021-Key-08)

摘要

摘要: 针对于远海岛礁建设，混凝土仍是主要的建筑材料之一。然而，远海建设却面临着自然资源缺乏和远洋运输费用高昂等问题。因此，本着因地制宜-就地取材的方针，利用珊瑚废弃物作为潜在的原材料制备混凝土是有必要的。以往研究表明单一增加珊瑚骨料(CS)或珊瑚粉(CP)不仅对珊瑚废弃物的利用率低，而且二者掺量有一定限值。因此，本研究提出联合应用CS和CP的思路来提升珊瑚废弃物的利用率并克服增加单一掺量而带来的不利影响。本研究联合应用CS和CP分别取代部分骨料和粘结剂制备砂浆，研究CS取代率对砂浆的力学性能、自收缩、干燥收缩和微结构的影响。研究表明，与未掺加CS的砂浆相比，联合应用10wt%~40wt%的CS和10wt%的CP制备的砂浆具有更高的强度。同时，随着CS含量的增加，砂浆的自收缩变形降低。另外，掺加CS也有益于降低砂浆的干燥收缩，当CS的取代率为30wt%时砂浆的干燥收缩值达到最低。由于内养护作用和啮合作用，CS和水泥基体紧密结合，并且适量CS也细化了样品的孔隙结构。本研究通过联合应用CS和CP制备出了强度、自收缩和干燥收缩均优于普通砂浆的海工水泥砂浆，这为远海岛礁建设提供了潜在的建筑材料。1珊瑚废弃物对水泥砂浆强度和体积稳定性的影响结果
- 珊瑚骨料 /
- 砂浆 /
- 强度 /
- 体积稳定性 /
- 微结构
Abstract: Application of coral waste in concrete is an effective strategy to produce building materials suitable for offshore island construction, but excessive application of coral waste can lead to drastic degradation of concrete properties. In order to improve the replacement ratio of coral waste while ensuring the performance of mortar, this study combined coral sand (CS) and coral waste powder (CP) to replace part of the aggregate and binder to produce mortar, and the effect of CS substitution ratio on the mechanical properties, autogenous shrinkage and drying shrinkage of mortar was investigated, and its influencing mechanism was analyzed in combination with microstructure and pore structure. The results demonstrate that the mortar produced by combined application of 10wt%–40wt% CS and 10wt% CP has higher strength than the mortar without CS. When the replacement ratio of CS is 30wt%, the strength of the mortar is the highest, and its 28 d and 90 d compressive strength are increased by 29.50% and 36.41% compared with the reference group, respectively. Meanwhile, with the increase of CS content, the autogenous shrinkage of mortar decreases. When the CS content is 40wt%, the 28 d autogenous shrinkage of the mortar is only 66.26% of that of the reference group. In addition, the addition of CS is also beneficial to reduce the drying shrinkage of mortar, and the drying shrinkage of mortar reaches the lowest when the substitution ratio of CS is 30wt%. The porous structure of CS makes it tightly occluded with the cement matrix, and its internal curing effect also promotes the improvement of interface performance. The results of the specific surface area (BET) also show that adding 30wt% CS reduces the porosity of the sample, but further increasing the CS content is not conducive to the development of the pore structure of the sample.
- coral aggregate /
- mortar /
- strength /
- volume stability /
- microstructure

HTML全文

图 1 水泥和珊瑚粉(CP)的粒径分布曲线

Figure 1. Particle size distribution of cement and coral powder(CP)

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图 2 CP的XRD图谱

Figure 2. XRD pattern of CP

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图 3 珊瑚废弃物基砂浆的制备流程

Figure 3. Preparation process of coral waste-based mortar

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图 4 不同状态下的珊瑚砂(CS)：(a)干燥；(b)饱和面干

Figure 4. Different states of coral sand CS: (a) Dry; (b) Saturated surface dry

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图 5 CS对砂浆力学性能的影响

Figure 5. Effect of coral sand(CS) on mechanical properties of mortar

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图 6 CS对砂浆自收缩的影响

Figure 6. Effect of CS on autogenous shrinkage of mortar

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图 7 CS掺量对砂浆干燥收缩的影响

Figure 7. Effect of CS content on drying shrinkage of mortar

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图 8 骨料与水泥基体间的ITZ图像

Figure 8. ITZ images between cement matrix and aggregate

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图 9 不同切面CS与浆体间的ITZ图像

Figure 9. ITZ images between cement matrix and CS in different directions

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图 10 CS对砂浆孔结构的影响

Figure 10. Effect of CS on pore structure of mortar

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表 1 原材料的化学组成

Table 1. Chemical composition of raw materials wt%

Material	CaO	SiO₂	Al₂O₃	Fe₂O₃	SO₃	MgO	LOI
Cement	48.16	26.41	6.24	5.02	4.53	2.27	3.69
CP	52.70	1.70	0.35	0.37	0.61	0.24	41.27
Note: LOI—Loss on ignition.

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表 2 珊瑚废弃物基砂浆配合比

Table 2. Mix proportions of coral waste-based mortar

Sample	Mix proportions/wt%
Sample	C	CP	ISO	CS	Water
0%CS-10%CP/M	405	45	1350	0	135
10%CS-10%CP/M			1215	135	135
20%CS-10%CP/M			1080	270	135
30%CS-10%CP/M			945	405	135
40%CS-10%CP/M			810	540	135
Note: ISO—International standard sand.

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