Compressive and Chloride Resistance Properties of Recycled Aggregate Concrete Mixed with Hole Slag

doi:10.12141/j.issn.1000-565X.230008

Abstract

Abstract:

Large amount of hole slag will be produced in the construction of punched cast-in-place piles for highway bridges. It is an effective countermeasure to apply the hole slag to concrete components of highway bridges nearby. Based on the recycling use of recycled coarse aggregates (RCAs) and considering that concrete structures in coastal areas are greatly affected by chloride corrosion, this paper prepared the recycled aggregate concrete mixed with the hole slag by replacing natural sand and natural coarse aggregates with the hole slag and RCAs, respectively. To investigate the effects of the hole slag replacement ratio (0, 50%, 70%, 100%) and RCAs replacement ratio (0, 50%, 70%, 100%) on the compressive and chloride resistance properties of such concrete, this paper carried out compression and chloride resistance tests of 96 specimens (48 cylinders with Φ 150×300 mm for compression test, and 48 cylinders with Φ 100×50 mm for chloride resistance test) made of such concrete, and mercury intrusion tests of the hole slag, river sand, and corresponding mortar. The test results show that: the compressive strength of such concrete decreases gradually with the increase of the replacement ratios of the hole slag and RCAs, and the reductions caused by the two are roughly the same; compared with RCAs, the influence of the hole slag on the elastic modulus and peak strain of such concrete is relatively limited; the chloride ion migration coefficient of such concrete increases gradually with the increase of the replacement ratios of the hole slag and RCAs on the whole, but the influence of the hole slag is obviously lower than that of RCAs; with the increase of the replacement ratio of the hole slag, the porosity of such concrete generally shows a trend of increasing gradually from fast to slow. When the hole slag and RCAs are used simultaneously in practical projects, it is suggested that the maximum replacement ratios of both should be limited to 50%.

Key words: hole slag, recycled coarse aggregates, concrete, compressive strength, chloride resistance, mercury intrusion test

CLC Number:

TU528.041

WU Bo, DING Jinpeng. Compressive and Chloride Resistance Properties of Recycled Aggregate Concrete Mixed with Hole Slag[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(9): 120-128.

Figures/Tables 14

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组别	试件编号	β/%	γ/%	抗压试件数/个	抗氯盐侵蚀试件数/个
组1	HS0-RCA0	0	0	3	3
	HS50-RCA0	50	0	3	3
	HS70-RCA0	70	0	3	3
	HS100-RCA0	100	0	3	3
组2	HS0-RCA50	0	50	3	3
	HS50-RCA50	50	50	3	3
	HS70-RCA50	70	50	3	3
	HS100-RCA50	100	50	3	3
组3	HS0-RCA70	0	70	3	3
	HS50-RCA70	50	70	3	3
	HS70-RCA70	70	70	3	3
	HS100-RCA70	100	70	3	3
组4	HS0-RCA100	0	100	3	3
	HS50-RCA100	50	100	3	3
	HS70-RCA100	70	100	3	3
	HS100-RCA100	100	100	3	3

材料	粒径/mm	压碎指标/%	表观密度/（kg·m^-3）	含水率/%	吸水率/%	细度模数	含泥量/%
河砂	0.15~4.75	18.0	2 681	0.2	0.62	2.34	0.60
成孔碎渣	0.15~4.75	22.7	2 543	0.2	0.53	2.72	1.00
天然粗骨料	5.00~25.00	5.2	2 740	0.1	0.55
再生粗骨料	5.00~25.00	16.0	2 597	1.8	3.60

编号	用量/（kg·m^-3）								固废含量/%
编号	水泥	水	附加水	河砂	成孔碎渣	天然粗骨料	再生粗骨料	减水剂	固废含量/%
HS0-RCA0	537.5	215	0.0	576.6	0.0	1 070.9	0.0	0.38	0.0
HS50-RCA0	537.5	215	0.0	288.3	288.3	1 070.9	0.0	0.38	12.0
HS70-RCA0	537.5	215	0.0	173.0	403.6	1 070.9	0.0	0.38	16.8
HS100-RCA0	537.5	215	0.0	0.0	576.6	1 070.9	0.0	0.38	24.0
HS0-RCA50	537.5	215	5.8	576.6	0.0	535.4	535.4	0.38	22.3
HS50-RCA50	537.5	215	5.8	288.3	288.3	535.4	535.4	0.38	34.3
HS70-RCA50	537.5	215	5.8	173.0	403.6	535.4	535.4	0.38	39.1
HS100-RCA50	537.5	215	5.8	0.0	576.6	535.4	535.4	0.38	46.3
HS0-RCA70	537.5	215	8.1	576.6	0.0	321.3	749.6	0.38	31.2
HS50-RCA70	537.5	215	8.1	288.3	288.3	321.3	749.6	0.38	43.2
HS70-RCA70	537.5	215	8.1	173.0	403.6	321.3	749.6	0.38	48.1
HS100-RCA70	537.5	215	8.1	0.0	576.6	321.3	749.6	0.38	55.3
HS0-RCA100	537.5	215	11.6	576.6	0.0	0.0	1 070.9	0.40	44.6
HS50-RCA100	537.5	215	11.6	288.3	288.3	0.0	1 070.9	0.40	56.6
HS70-RCA100	537.5	215	11.6	173.0	403.6	0.0	1 070.9	0.40	61.4
HS100-RCA100	537.5	215	11.6	0.0	576.6	0.0	1 070.9	0.40	68.6

组别	试件编号	f_c/MPa		E_c/GPa		ε_p/10^-6
组别	试件编号	平均值	标准差	平均值	标准差	平均值	标准差
组1	HS0-RCA0	53.6	0.37	43.6	2.0	1 991	65
	HS50-RCA0	53.3	0.81	40.7	0.4	2 040	122
	HS70-RCA0	51.2	0.37	40.5	0.4	2 002	146
	HS100-RCA0	50.8	1.02	39.3	0.5	2 033	102
组2	HS0-RCA50	52.3	0.82	35.7	0.5	2 332	149
	HS50-RCA50	51.3	0.90	34.7	0.3	2 293	104
	HS70-RCA50	48.5	1.03	33.8	2.8	2 139	73
	HS100-RCA50	46.3	0.78	35.7	3.6	2 228	31
组3	HS0-RCA70	50.7	0.54	32.4	0.1	2 401	69
	HS50-RCA70	48.5	0.31	33.5	2.9	2 310	166
	HS70-RCA70	47.5	0.21	31.4	0.9	2 301	89
	HS100-RCA70	46.0	0.94	32.1	1.3	2 215	51
组4	HS0-RCA100	50.2	0.33	30.5	1.0	2 532	80
	HS50-RCA100	48.4	0.49	30.6	2.2	2 546	130
	HS70-RCA100	47.0	0.90	28.8	1.2	2 388	92
	HS100-RCA100	44.8	0.66	29.8	0.8	2 287	104

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