高性能微细钢纤维硫铝酸盐水泥混凝土收缩性能及预测模型

doi:10.16552/j.cnki.issn1001-1625.2025.0791

摘要/Abstract

摘要：

硫铝酸盐水泥（SAC）具有微膨胀、低收缩的特性，将SAC基复合材料作为装配式结构节点连接材料有望降低节点的收缩开裂风险。本研究通过收缩测试、水化热测试和SEM测试揭示了钢纤维硫铝酸盐水泥混凝土（SFRSC）收缩的变化规律及机理。结果表明，降低胶骨比、砂率、粉煤灰掺量，或提高钢纤维体积分数可以减小SFRSC的收缩，但钢纤维体积分数超过3.0%时，继续增大钢纤维体积分数对自收缩的抑制效果不再显著。SFRSC的收缩显著低于钢纤维普通硅酸盐水泥混凝土。SFRSC微观结构表明钙矾石（AFt）转变为单硫型水化硫铝酸钙（AFm）的过程伴随大量结合水释放和固相体积减小，这共同导致了SFRSC收缩。SFRSC收缩是SAC水化反应、自干燥效应与钢纤维约束共同作用的结果，AFt、AFm和钢纤维协同作用构成了“膨胀补偿-收缩抑制-机械约束”的多级收缩抑制体系。最后，基于ACI规范和CEB-FIP规范，提出了SFRSC收缩计算模型。

关键词: 钢纤维混凝土, 硫铝酸盐水泥, 收缩, 水化热, 胶骨比, 砂率, 收缩模型

Abstract:

Sulphoaluminate cement （SAC） has the characteristics of micro-expansion and low shrinkage. Therefore， Using SAC-based composite materials as the connection material for precast structural joint， is expected to reduce the risk of shrinkage cracking. This study revealed the variation law and mechanism of the shrinkage of steel fiber reinforced sulphoaluminate cement concrete （SFRSC） through shrinkage tests， hydration heat tests and SEM tests. The results indicate that decreasing binder-aggregate ratio， sand ratio and fly ash content， or increasing steel fiber volume fraction， can restrain the shrinkage of SFRSC. The inhibitory effect of steel fiber plateaus when its volume exceeds 3.0%. The shrinkage of SFRSC is significantly lower than that of steel fiber reinforced ordinary Portland cement concrete. Micro-structural observations indicate that the transformation of ettringite （AFt） into calcium monosulfoaluminate hydrate （AFm） is accompanied by substantial bound-water release and a reduction in solid volume， jointly contributing to SFRSC shrinkage. The shrinkage of SFRSC arises from the combined effects of SAC hydration， self-desiccation， and steel fiber constraint. The synergistic action among AFt， AFm and steel fiber establish a multi-level shrinkage-suppression system in SFRSC， characterizing by expansion compensation-shrinkage inhibition-mechanical restraint. Finally， a predictive model for SFRSC shrinkage is proposed based on ACI code and CEB-FIP code.

Key words: steel fiber reinforced concrete, sulphoalumimate cement, shrinkage, hydration heat, binder-aggregate ratio, sand ratio, shrinkage model

中图分类号:

TU528.58

李小鹏, 赵军, 陈哲涵, 梁梦阳. 高性能微细钢纤维硫铝酸盐水泥混凝土收缩性能及预测模型[J]. 硅酸盐通报, 2026, 45(2): 461-470.

LI Xiaopeng, ZHAO Jun, CHEN Zhehan, LIANG Mengyang. Shrinkage and Prediction Model of High-Performance Micro-Fine Steel Fiber Reinforced Sulphoaluminate Cement Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(2): 461-470.

图/表 9

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Material	Mass fraction/%
Material	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	SO₃	K₂O	TiO₂	MnO	Na₂O	Loss
SAC	10.08	17.65	3.13	47.87	1.82	16.54	1.23	0.78	—	0.38	0.52
OPC	22.02	7.08	3.24	55.01	5.21	5.03	1.24	0.31	—	0.46	0.40
FA	50.30	32.90	6.56	3.30	0.81	1.73	1.60	1.23	—	0.98	0.59

Material	Mass fraction/%
Material	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	SO₃	K₂O	TiO₂	MnO	Na₂O	Loss
SAC	10.08	17.65	3.13	47.87	1.82	16.54	1.23	0.78	—	0.38	0.52
OPC	22.02	7.08	3.24	55.01	5.21	5.03	1.24	0.31	—	0.46	0.40
FA	50.30	32.90	6.56	3.30	0.81	1.73	1.60	1.23	—	0.98	0.59

Sample No.	Mix proportion/（kg‧m^-3）							Test variable				f_cu/MPa
Sample No.	C	FA	NS	CA	W	SF	PS	J	S/%	F/%	V_f/%	f_cu/MPa
SV3J100S45F0	1 059	0	477	582	318	234	2.12	1.00	45	0	3.0	72.6
SV3J85S45F0	896	0	474	580	269	234	1.79	0.85	45	0	3.0	83.9
SV3J70S45F0	824	0	530	646	247	234	1.65	0.70	45	0	3.0	92.5
SV3J70S55F0	821	0	645	528	246	234	1.64	0.70	55	0	3.0	93.1
SV3J70S65F0	817	0	759	409	245	234	1.63	0.70	65	0	3.0	87.1
SV3J70S45F1	739	82	528	645	246	234	1.64	0.70	45	10	3.0	81.1
SV3J70S45F2	654	164	526	642	245	234	1.64	0.70	45	20	3.0	66.9
SV0J100S45F0	1 027	0	462	565	308	0	2.05	1.00	45	0	0	63.1
SV6J100S45F0	1 092	0	492	601	328	468	2.18	1.00	45	0	6.0	70.2
OV0J100S45F0	1 027	0	462	565	308	0	2.05	1.00	45	0	0	75.4
OV3J100S45F0	1 059	0	477	582	318	234	2.12	1.00	45	0	3.0	84.3
OV6J100S45F0	1 092	0	492	601	328	468	2.18	1.00	45	0	6.0	82.1

Sample No.	Mix proportion/（kg‧m^-3）							Test variable				f_cu/MPa
Sample No.	C	FA	NS	CA	W	SF	PS	J	S/%	F/%	V_f/%	f_cu/MPa
SV3J100S45F0	1 059	0	477	582	318	234	2.12	1.00	45	0	3.0	72.6
SV3J85S45F0	896	0	474	580	269	234	1.79	0.85	45	0	3.0	83.9
SV3J70S45F0	824	0	530	646	247	234	1.65	0.70	45	0	3.0	92.5
SV3J70S55F0	821	0	645	528	246	234	1.64	0.70	55	0	3.0	93.1
SV3J70S65F0	817	0	759	409	245	234	1.63	0.70	65	0	3.0	87.1
SV3J70S45F1	739	82	528	645	246	234	1.64	0.70	45	10	3.0	81.1
SV3J70S45F2	654	164	526	642	245	234	1.64	0.70	45	20	3.0	66.9
SV0J100S45F0	1 027	0	462	565	308	0	2.05	1.00	45	0	0	63.1
SV6J100S45F0	1 092	0	492	601	328	468	2.18	1.00	45	0	6.0	70.2
OV0J100S45F0	1 027	0	462	565	308	0	2.05	1.00	45	0	0	75.4
OV3J100S45F0	1 059	0	477	582	318	234	2.12	1.00	45	0	3.0	84.3
OV6J100S45F0	1 092	0	492	601	328	468	2.18	1.00	45	0	6.0	82.1

Sample No.	Test/10^-6				56 dcalculation/10^-6	Error/%	Sample No.	Test/10^-6				56 dcalculation/10^-6	Error/%
Sample No.	2 d	7 d	28 d	56 d	56 dcalculation/10^-6	Error/%	Sample No.	2 d	7 d	28 d	56 d	56 dcalculation/10^-6	Error/%
SV3J100S45F0	104	158	253	272	298	-9.43	SV3J70S45F1	114	163	231	245	233	4.71
SV3J85S45F0	69	131	207	232	241	-4.05	SV3J70S45F2	142	177	258	274	282	-2.83
SV3J70S45F0	79	114	171	183	185	-1.18	SV0J100S45F0	245	388	537	568	554	2.53
SV3J70S55F0	100	153	208	224	225	-0.38	SV6J100S45F0	106	144	212	228	192	15.96
SV3J70S65F0	152	195	251	263	265	-0.59