Sulfate Resistance of Steel Slag Powder PVA Fiber-Reinforced Cement Composite Material

doi:10.11988/ckyyb.20230603

Abstract

Abstract:

To explore the reuse of steel slag powder in PVA-ECC (Polyvinyl Alcohol Engineered Cementitious Composite), we produced PVA-ECC samples by incorporating steel slag powder at various mass fractions. We measured the mass change, compressive strength, and tensile performance of the test samples in Na₂SO₄ solution (with a mass fraction of 5%) during dry-wet cycle accelerated sulfate attack tests, cubic compressive strength tests, and axial tensile tests. By microstructural and phase analysis using scanning electron microscopy (SEM) and X-ray diffraction (XRD) meter, we examined the influence of steel slag powder content on the sulfate resistance of PVA-ECC. Results indicate that when the steel slag powder content in PVA-ECC reaches 20%, the mass loss remains lower than that of the reference group. PVA-ECC with a low dosage of steel slag powder demonstrates sound corrosion resistance, with compressive and corrosion resistance coefficients of 1.13, 1.02, and 0.96 for the S20 group, respectively. PVA-ECC specimens containing steel slag powder exhibited multiple cracks; however, the addition of steel slag powder enhanced tensile strength, with a maximum increase of 31.4% observed in the S40 group. The inclusion of an appropriate amount of steel slag powder effectively mitigates corrosion damage, with no significant material deterioration observed within the studied age range when the addition does not exceed 60%.

Key words: PVA fiber, steel slag powder, sulfate attack, dry-wet cycle, tensile strength, durability performance

CLC Number:

TU528混凝土及混凝土制品

SU Jun, FAN Zi-kang, CAI Xin-hua, XIAO Shu. Sulfate Resistance of Steel Slag Powder PVA Fiber-Reinforced Cement Composite Material[J]. Journal of Changjiang River Scientific Research Institute, 2024, 41(11): 172-180.

Figures/Tables 17

Table 1 Mix proportion of PVA-ECC material mixed with steel slag powder

水胶比	组别	掺量/%					减水剂掺量/%	PVA掺量/%
水胶比	组别	水泥	硅粉	钢渣粉	水	砂	减水剂掺量/%	PVA掺量/%
0.25	S0	98	2	0	25	20	1	2
	S20	78	2	20	25	20	1	2
	S40	58	2	40	25	20	1	2
	S60	38	2	60	25	20	1	2
	S80	18	2	80	25	20	1	2

Table 2 Chemical composition of cement

化学组成	质量分数/%	化学组成	质量分数/%
SiO₂	17.63	Na₂O	0.20
CaO	65.39	MgO	1.43
Fe₂O₃	4.11	P₂O₅	0.16
Al₂O₃	5.35	TiO₂	0.33
K₂O	0.70	SO₃	3.51

Table 3 Basic properties of steel slag powder

来源	密度/ (g·cm^-3)	比表面积/ (m²·kg^-1)	活性指数/%
来源	密度/ (g·cm^-3)	比表面积/ (m²·kg^-1)	7 d	28 d
本文	5.3	400	71.6	84.2
《用于水泥和混凝土中的钢渣粉标准》(GB/T 20491—2006)	≥3.2	—	≥65	≥80

Table 4 XRF detection result for steel slag powder

化学组成	质量分数/%	化学组成	质量分数/%
CaO	43.55	MgO	4.34
SiO₂	14.22	MnO	2.98
Fe₂O₃	24.26	SO₃	1.39
Al₂O₃	2.86	P₂O₅	1.24

Fig.1 XRD spectrum of steel slag powder

Table 5 Physical performance indicators of PVA fibers

长度/ mm	直径/ mm	长径比	抗拉强度/MPa	延伸率/%	抗拉弹性模量/GPa	密度/ (g·cm^-3)
12	40	300	1 600	7	42	1.3

Fig.2 Test equipment

Fig.3 Change of mass loss rate of cementitious composite material

Fig.4 Apparent morphology of sulfate-corroded test cubes

Table 6 Strength of PVA-ECC adhesive sand mixed with steel slag powder

组别	立方体抗压强度/MPa
组别	3 d	7 d	28 d
S0	45.39	48.72	50.17
S20	42.56	46.73	57.30
S40	27.46	40.39	48.51
S60	24.35	34.42	43.29
S80	10.46	20.79	29.87

Fig.5 Changes in compressive strength and corrosion resistance coefficient of PVA-ECC mixed with steel slag powder

Fig.6 Axial tensile failure of PVA-ECC specimens mixed with steel slag powder at different corrosion ages

Fig.7 Tensile stress-strain curves of each group of specimens at different ages

Table 7 Tensile strength and corrosion resistance coefficient Kt of PVA-ECC material mixed with steel slag powder

组别	耐腐蚀系数 $K_{t}$
组别	30次干湿循环	60次干湿循环	120次干湿循环
S0	1.25	1.16	1.10
S20	1.46	1.28	1.37
S40	0.92	1.10	1.10
S60	0.93	1.28	1.27
S80	0.95	1.07	1.07

Table 7 Tensile strength and corrosion resistance coefficient Kt of PVA-ECC material mixed with steel slag powder

组别	耐腐蚀系数 $K_{t}$
组别	30次干湿循环	60次干湿循环	120次干湿循环
S0	1.25	1.16	1.10
S20	1.46	1.28	1.37
S40	0.92	1.10	1.10
S60	0.93	1.28	1.27
S80	0.95	1.07	1.07

Fig.8 Changes in ultimate tensile properties of PVA-ECC mixed with steel slag powder

Fig.9 Microstructure of PVA-ECC with steel slag powder at different corrosion ages

Fig.10 XRD patterns of PVA-ECC with different amounts of steel slag powder before and after corrosion

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