Pumped Concrete with Multiple Mineral Admixtures Used in Sluice Construction

doi:10.11988/ckyyb.20230811

Abstract

Abstract:

The intricate structure of sluice coupled with the high dosage of binder materials in pumped concrete can lead to various cracks. We examined the performance of pumped concrete mixed with fly ash, slag powder, or both in various dosages. Experimental tests include concrete mixing, mechanical properties, deformation, thermal characteristics, and durability. Findings indicate that mineral admixture combining slag powder and fly ash significantly enhances concrete mix performance. Specifically, concrete incorporating 20% fly ash and 20% slag powder exhibits nearly equivalent strength to concrete with 30% fly ash alone, while reducing the adiabatic temperature rise by 2.9 ℃ and improving crack resistance. This composite admixture could help address the cracking problem for the pumped concrete used in the sluice of the Yangtze River to Huaihe River Diversion Project.

Key words: multiple mineral admixtures, fly ash, slag power, sluice, pumped concrete

CLC Number:

TU528混凝土及混凝土制品

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PENG Jian, CAO Kai-feng, YAN Jian-jun, LIU Rong-chao. Pumped Concrete with Multiple Mineral Admixtures Used in Sluice Construction[J]. Journal of Changjiang River Scientific Research Institute, 2024, 41(12): 155-161.

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URL: http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20230811

http://ckyyb.crsri.cn/EN/Y2024/V41/I12/155

Figures/Tables 15

Table 1 Physical properties performance of cement

水泥品种	比表面积/ (m²·kg^-1)	密度/ (kg·m^-3)	标准稠度/%	安定性	凝结时间/min		抗折强度/MPa			抗压强度/MPa
水泥品种	比表面积/ (m²·kg^-1)	密度/ (kg·m^-3)	标准稠度/%	安定性	初凝	终凝	3 d	7 d	28 d	3 d	7 d		28 d
枞阳海螺	360	3 120	24.8	合格	190	255	6.8	7.5	8.4	33.1	36.8		50.9

Table 1 Physical properties performance of cement

水泥品种	比表面积/ (m²·kg^-1)	密度/ (kg·m^-3)	标准稠度/%	安定性	凝结时间/min		抗折强度/MPa			抗压强度/MPa
水泥品种	比表面积/ (m²·kg^-1)	密度/ (kg·m^-3)	标准稠度/%	安定性	初凝	终凝	3 d	7 d	28 d	3 d	7 d		28 d
枞阳海螺	360	3 120	24.8	合格	190	255	6.8	7.5	8.4	33.1	36.8		50.9

Table 2 Performance of fly ash

粉煤灰品种	细度/ %	比表面积/ (m²·kg^-1)	需水量比/%	密度/ (kg·m^-3)	烧失量/%	强度比/%
粉煤灰品种	细度/ %	比表面积/ (m²·kg^-1)	需水量比/%	密度/ (kg·m^-3)	烧失量/%	7 d	28 d
铜陵 Ⅱ级	23.8	345	104	2 320	5.8	72.7	83.5

Table 2 Performance of fly ash

粉煤灰品种	细度/ %	比表面积/ (m²·kg^-1)	需水量比/%	密度/ (kg·m^-3)	烧失量/%	强度比/%
粉煤灰品种	细度/ %	比表面积/ (m²·kg^-1)	需水量比/%	密度/ (kg·m^-3)	烧失量/%	7 d	28 d
铜陵 Ⅱ级	23.8	345	104	2 320	5.8	72.7	83.5

Table 3 Performance of slag powder

粉煤灰品种	含水量/%	比表面积/ (m²·kg^-1)	流动度比/%	表观密度/ (kg·m^-3)	烧失量/%	强度比/%
粉煤灰品种	含水量/%	比表面积/ (m²·kg^-1)	流动度比/%	表观密度/ (kg·m^-3)	烧失量/%	7 d	28 d
铜陵鹏泰	0.29	455	102	2 860	1.2	80.5	97.1

Table 3 Performance of slag powder

粉煤灰品种	含水量/%	比表面积/ (m²·kg^-1)	流动度比/%	表观密度/ (kg·m^-3)	烧失量/%	强度比/%
粉煤灰品种	含水量/%	比表面积/ (m²·kg^-1)	流动度比/%	表观密度/ (kg·m^-3)	烧失量/%	7 d	28 d
铜陵鹏泰	0.29	455	102	2 860	1.2	80.5	97.1

Table 4 Result of particle grading of crushed stone

筛孔尺寸/ mm	31.5	26.5	19.0	16.0	9.5	4.75	2.36	筛底
累计筛余质量分数/%	0	0.2	43.5	45.6	79.0	98.3	99.8	0.2

Table 4 Result of particle grading of crushed stone

筛孔尺寸/ mm	31.5	26.5	19.0	16.0	9.5	4.75	2.36	筛底
累计筛余质量分数/%	0	0.2	43.5	45.6	79.0	98.3	99.8	0.2

Table 5 Performance of water reducing agent

减水剂掺量/%	固体含量/%	减水率/%	含气量/%	泌水率比/%	28 d收缩率比/%	凝结时间差/min			抗压强度比/%
减水剂掺量/%	固体含量/%	减水率/%	含气量/%	泌水率比/%	28 d收缩率比/%	初凝	终凝	3 d		7 d	28 d
1.5	7.7	27.6	3.2	31	90	90	110	138		142	135

Table 5 Performance of water reducing agent

减水剂掺量/%	固体含量/%	减水率/%	含气量/%	泌水率比/%	28 d收缩率比/%	凝结时间差/min			抗压强度比/%
减水剂掺量/%	固体含量/%	减水率/%	含气量/%	泌水率比/%	28 d收缩率比/%	初凝	终凝	3 d		7 d	28 d
1.5	7.7	27.6	3.2	31	90	90	110	138		142	135

Table 6 Mix ratio of concrete and material consumption per cubic meter

编号	水灰比	胶凝材料组成百分比/%			砂率/ %	减水剂掺量/%	每立方米混凝土材料用量/(kg·m^-3)
编号	水灰比	水泥	粉煤灰	矿渣粉	砂率/ %	减水剂掺量/%	水	水泥	粉煤灰	矿渣粉	减水剂	砂子	石子
A1	0.4	70	30	0	40	1.5	140	245	105	0	5.25	730	1167
A2	0.4	70	20	10	40	1.5	140	245	70	35	5.25	733	1172
A3	0.4	60	40	0	40	1.5	140	210	140	0	5.25	724	1 159
A4	0.4	60	20	20	40	1.5	140	210	70	70	5.25	729	1 165
A5	0.4	50	30	20	40	1.5	140	175	105	70	5.25	728	1 164

Table 6 Mix ratio of concrete and material consumption per cubic meter

编号	水灰比	胶凝材料组成百分比/%			砂率/ %	减水剂掺量/%	每立方米混凝土材料用量/(kg·m^-3)
编号	水灰比	水泥	粉煤灰	矿渣粉	砂率/ %	减水剂掺量/%	水	水泥	粉煤灰	矿渣粉	减水剂	砂子	石子
A1	0.4	70	30	0	40	1.5	140	245	105	0	5.25	730	1167
A2	0.4	70	20	10	40	1.5	140	245	70	35	5.25	733	1172
A3	0.4	60	40	0	40	1.5	140	210	140	0	5.25	724	1 159
A4	0.4	60	20	20	40	1.5	140	210	70	70	5.25	729	1 165
A5	0.4	50	30	20	40	1.5	140	175	105	70	5.25	728	1 164

Table 7 Hydration heat of cementitious materials

编号	材料的质量分数/%			水化热/(kJ·kg^-1)
编号	P.O42.5水泥	粉煤灰	矿渣粉	1 d	3 d	7 d
C1	70	30	0	167	192	236
C2	70	20	10	173	205	243
C3	60	40	0	154	176	227
C4	60	20	20	162	184	235
C5	50	30	20	153	181	228

Table 7 Hydration heat of cementitious materials

编号	材料的质量分数/%			水化热/(kJ·kg^-1)
编号	P.O42.5水泥	粉煤灰	矿渣粉	1 d	3 d	7 d
C1	70	30	0	167	192	236
C2	70	20	10	173	205	243
C3	60	40	0	154	176	227
C4	60	20	20	162	184	235
C5	50	30	20	153	181	228

Table 8 Test results of concrete mixture performance

编号	坍落度/ mm	含气量/%	和易性	泌水率/%	凝结时间
编号	坍落度/ mm	含气量/%	和易性	泌水率/%	初凝	终凝
A1	142	3.0	良好	0.7	9 h20 min	14 h42 min
A2	145	3.2	良好	0.8	9 h07 min	13 h53 min
A3	156	3.2	好	0.5	10 h25 min	16 h50 min
A4	180	3.3	好	0.8	9 h10 min	14 h23 min
A5	174	3.1	好	0.7	9 h42 min	15 h38 min

Table 8 Test results of concrete mixture performance

编号	坍落度/ mm	含气量/%	和易性	泌水率/%	凝结时间
编号	坍落度/ mm	含气量/%	和易性	泌水率/%	初凝	终凝
A1	142	3.0	良好	0.7	9 h20 min	14 h42 min
A2	145	3.2	良好	0.8	9 h07 min	13 h53 min
A3	156	3.2	好	0.5	10 h25 min	16 h50 min
A4	180	3.3	好	0.8	9 h10 min	14 h23 min
A5	174	3.1	好	0.7	9 h42 min	15 h38 min

Table 9 Compressive strength and splitting tensile strength of concrete

编号	水胶比	粉煤灰掺量/ %	矿渣粉掺量/ %	抗压强度/MPa			劈拉强度/MPa
				3 d	7 d	28 d	3 d	7 d	28 d
				A1	0.4	30	0	31.6	38.3	45.9	2.9	3.6	3.9
A2	0.4	20	10	28.9	35.2	44.3	2.4	3.3	3.7
A3	0.4	40	0	29.4	33.8	42.5	2.5	3.2	3.5
A4	0.4	20	20	30.3	37.4	45.6	2.8	3.5	3.8
A5	0.4	30	20	29.2	34.9	42.2	2.6	3.0	3.4

Table 9 Compressive strength and splitting tensile strength of concrete

编号	水胶比	粉煤灰掺量/ %	矿渣粉掺量/ %	抗压强度/MPa			劈拉强度/MPa
				3 d	7 d	28 d	3 d	7 d	28 d
				A1	0.4	30	0	31.6	38.3	45.9	2.9	3.6	3.9
A2	0.4	20	10	28.9	35.2	44.3	2.4	3.3	3.7
A3	0.4	40	0	29.4	33.8	42.5	2.5	3.2	3.5
A4	0.4	20	20	30.3	37.4	45.6	2.8	3.5	3.8
A5	0.4	30	20	29.2	34.9	42.2	2.6	3.0	3.4

Fig.1 Compressive strength curves of concrete at different ages

Fig.2 SEM images of hydration product at 28-d age

Fig.3 Curves of drying shrinkage rate of concrete

Fig.4 Relationship between adiabatic temperature rise and age of concrete

Fig.5 Results of concrete frost resistance test

Table 10 Mix ratio for concrete construction

强度等级	抗渗等级	抗冻等级	水胶比	体积砂率/ %	配合比/(kg·m^-3)
强度等级	抗渗等级	抗冻等级	水胶比	体积砂率/ %	水	水泥	粉煤灰	矿渣粉	砂	碎石(5~31.5 mm)		减水剂
C25	W4	F100	0.4	40	140	210	70	70	724	1 145		5.25

Table 10 Mix ratio for concrete construction

强度等级	抗渗等级	抗冻等级	水胶比	体积砂率/ %	配合比/(kg·m^-3)
强度等级	抗渗等级	抗冻等级	水胶比	体积砂率/ %	水	水泥	粉煤灰	矿渣粉	砂	碎石(5~31.5 mm)		减水剂
C25	W4	F100	0.4	40	140	210	70	70	724	1 145		5.25

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