HCSA膨胀剂与SAP对低水胶比水泥净浆体积变形的影响

顾春平; 徐艳文; 韦海霞

doi:10.13801/j.cnki.fhclxb.20230908.001

HCSA膨胀剂与SAP对低水胶比水泥净浆体积变形的影响

doi: 10.13801/j.cnki.fhclxb.20230908.001

顾春平^{1, 2, ,},
徐艳文¹,
韦海霞¹

1.
浙江工业大学　土木工程学院，杭州 310023
2.
浙江省工程结构与防灾减灾技术研究重点实验室，杭州 310023

基金项目: 国家自然科学基金(52378272)；浙江省自然科学基金(LY22E080014)；浙江省重点研发计划(2021C01060)

详细信息

通讯作者:
顾春平，博士，副研究员，硕士生导师，研究方向为高性能水泥基材料、绿色建筑材料　E-mail: guchunping@zjut.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: 2023-07-05
- 修回日期: 2023-08-17
- 录用日期: 2023-08-31
- 网络出版日期: 2023-09-11
- 刊出日期: 2024-05-15

Effect of HCSA expansive agent and SAP on deformation of cement paste with low water binder ratio

GU Chunping^{1, 2
, ,},
XU Yanwen¹,
WEI Haixia¹

1.
College of Civil Engineering , Zhejiang University of Technology, Hangzhou 310023, China
2.
Key Laboratory of Civil Engineering Structures & Disaster Prevention and Mitigation Technology of Zhejiang Province, Hangzhou 310023, China

Funds: National Natural Science Foundation of China (52378272); Zhejiang Provincial Natural Science Foundation of China (LY22E080014); Key Research and Development Program of Zhejiang Province (2021C01060)

摘要

摘要: 为解决低水胶比下高性能硫铝酸钙(High performance calcium sulpho aluminate，HCSA)膨胀剂补偿收缩效果不显著这一问题，以高吸水树脂(Super-absorbent polymer，SAP)为内养剂，研究HCSA膨胀剂和SAP单掺、复掺对低水胶比(0.25)下水泥净浆体积变形(自收缩、干燥收缩、浸水变形)的影响，并探讨HCSA膨胀剂与SAP复掺的协同效应。结果表明：单掺HCSA膨胀剂和SAP均能降低水泥净浆的自收缩和干燥收缩、增大浸水条件下膨胀变形。密封和浸水条件下，HCSA的膨胀效果较干燥条件下时显著。复掺HCSA膨胀剂和SAP存在协同作用，SAP预吸水促进了HCSA膨胀剂效果的发挥。密封条件下，协同效应主要发生在约1天前，而后仍在缓慢发挥。浸水条件下，两者复掺也发挥一定的协同作用；干燥条件下，复掺的协同作用主要发生在7天之后，在早期SAP未能促进HCSA效能的发挥，反而使低水胶比水泥净浆干燥收缩变大。
- 水泥净浆 /
- HCSA膨胀剂 /
- SAP /
- 自收缩 /
- 干燥收缩
Abstract: In order to solve the problem that the shrinkage compensation effect of high performance calcium sulpho aluminate (HCSA) expansive agent was not significant at a low water to binder ratio, this study used super-absorbent polymer (SAP) as the internal curing agent to study the influence of HCSA, SAP, HCSA and SAP together on the volume deformation (autogenous shrinkage, drying shrinkage, deformation in water) of cement paste with a low water to binder ratio (0.25), and the synergistic effect of HCSA expansive agent and SAP was discussed. The results show that both HCSA expansive agent and SAP reduce the autogenous shrinkage and dry shrinkage of cement paste, and increase the expansion deformation when immersed in water. The expansive effects of HCSA under sealed and immersed condition are more significant than that under drying condition. HCSA and SAP have synergistic effect, i.e. the pre-absorbed water by SAP could promote the effectiveness of HCSA. Under sealed condition, the synergistic effect mainly occur before about 1 day, and then it still work slowly. When immersed in water, HCSA and SAP also show synergistic effect. But under drying condition, the synergistic effect of HCSA and SAP mainly takes effect after 7 days. SAP could not promote the effectiveness of HCSA at early ages, and the addition of HCSA and SAP together increases the drying shrinkage of cement paste with low water to binder ratio.
- cement paste /
- HCSA expansive agent /
- SAP /
- autogenous shrinkage /
- drying shrinkage

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图 1 HCSA膨胀剂和高吸水性树脂(SAP)对水泥净浆抗压强度的影响

Figure 1. Effect of HCSA expansive agent and super-absorbent polymer (SAP) on compressive strength of cement pastes

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图 2 HCSA膨胀剂或SAP单掺对水泥净浆自收缩的影响：(a) 0~21天；(b) 0~1.6天

Figure 2. Effect of HCSA expansive agent or SAP on autogenous shrinkage of cement pastes: (a) 0-21 days; (b) 0-1.6 days

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图 3 HCSA膨胀剂和SAP复掺对水泥净浆自收缩的影响：(a) 4%HCSA；(b) 8%HCSA

Figure 3. Effect of HCSA expansive agent and SAP on autogenous shrinkage of cement pastes: (a) 4%HCSA; (b) 8%HCSA

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图 4 HCSA膨胀剂或SAP单掺对水泥净浆干燥收缩的影响

Figure 4. Effect of HCSA expansive agent or SAP on drying shrinkage of cement pastes

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图 5 HCSA膨胀剂和SAP复掺对水泥净浆干燥收缩的影响：(a) 4%HCSA；(b) 8%HCSA

Figure 5. Effect of HCSA expansive agent and SAP on drying shrinkage of cement pastes: (a) 4%HCSA; (b) 8%HCSA

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图 6 HCSA膨胀剂或SAP单掺对水泥净浆浸水变形的影响

Figure 6. Effect of HCSA expansive agent or SAP on deformation of cement pastes in water

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图 7 HCSA膨胀剂和SAP复掺对水泥净浆浸水变形的影响：(a) 4%HCSA；(b) 8%HCSA

Figure 7. Effect of HCSA expansive agent and SAP on deformation of cement pastes in water: (a) 4%HCSA; (b) 8%HCSA

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图 8 水泥净浆在不同环境条件下协同效应的体积增量(Δε)：(a) 4%HCSA；(b) 8%HCSA

Figure 8. Volume increment of synergistic effect (Δε) of cement pastes under different environmental conditions:(a) 4%HCSA; (b) 8%HCSA

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表 1 水泥和高性能硫铝酸钙(HCSA)膨胀剂的主要化学组成

Table 1. Main chemical composition of cement and high performance calcium sulpho aluminate (HCSA)

Compound	CaO	SiO₂	Al₂O₃	MgO	Fe₂O₃	SO₃	K₂O
Cement/wt%	54.97	24.95	8.62	4.16	3.54	2.26	0.70
HCSA/wt%	49.25	8.58	16.04	2.32	2.16	20.47	0.25

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表 2 水泥的物理性能

Table 2. Physical properties of cement

Specific surface area/(m²·kg⁻¹)	Water requirement of normal consistency/wt%	Setting time/min		Flexural strength/MPa		Compressive strength/MPa
Specific surface area/(m²·kg⁻¹)	Water requirement of normal consistency/wt%	Initial set	Final set	3 d	28 d	3 d	28 d
333	27.8	145	219	5.6	8.6	27.6	56.1

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表 3 HCSA膨胀剂的物理性能

Table 3. Physical properties of HCSA expansive agent

Alkali content (Na₂O+0.658 K₂O)/wt%	Limit expansion rate in water for 7 d/%	Setting time/min		Fineness		Compressive strength/MPa
Alkali content (Na₂O+0.658 K₂O)/wt%	Limit expansion rate in water for 7 d/%	Initial set	Final set	Specific surface area/(m²·kg⁻¹)	1.18 mm sieving residue/%	7 d
0.28	0.056	165	330	374	0	26.8

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表 4 水泥净浆配合比

Table 4. Mix proportions of cement pastes

Sample	Cement/wt%	HCSA/wt%	Superplasticizer/wt%	SAP/wt%	W_i/B	W_e/B	W_t/B
Control	100	0	0.2	0	0	0.25	0.25
4%HCSA	96	4
8%HCSA	92	8
0.04%SAP	100	0		0.04	0.08	0.17
4%HCSA+0.04%SAP	96	4
8%HCSA+0.04%SAP	92	8
Notes：SAP—Superabsorbent polymer; W_i/B—Internal curing water-to-binder ratio; W_e/B—Free water-to-binder ratio; W_t/B—Total water-to-binder ratio.

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