Advances in Materials Science and Engineering

Research Article

Estimation of the Pumping Pressure from Concrete Composition Based on the Identified Tribological Parameters

Table 3

(a) Comparison between the interface yield stress calculated by the model and that measured by the tribometer in the first test program. (b) Comparison between the interface yield stress calculated by the model and that measured by the tribometer in the second test program.

(a)


Concretes	W/C	A/S	(m³)	Slump (cm)

Series 1: influence of cement paste volume ()
B11	0.5	1.2	0.378	21	212.3	48.3	229.2	43.9
B12			0.354	19	275.6	57.1	276.5	50.2
B13			0.329	15	349.1	60.3	385.6	62.9
B14			0.308	13	420.4	64.3	481.6	69.3

Series 2: influence of water/cement ratio (W/C
B21	0.55	1.2	0.378	23	163.6	25.2	168.1	37.5
B22	0.5			21	212.3	48.3	229.2	43.9
B23	0.45			18	411.0	64.2	376.3	53.4
B24	0.4			11	882.8	79.5	917.0	75.6

Series 3: influence of aggregates/sand ratio (A/S)
B31	0.5	1	0.354	19	328.1	52.4	283.9	50.2
B32		1.2		19	275.6	57.1	276.5	50.2
B33		1.4		19	263.5	47.5	271.9	50.2
B34		1.6		19	197.2	53.2	269.0	50.2

Series 4: influence of aggregates diameter
Crushed ag. 4/12
B41	0.5	1.2	0.378	19	283.9	56.0	303.4	50.2
B42	0.5	1.2	0.354	14	445.0	76.1	447.3	66.1
Crushed ag. 4/20
B43	0.5	1.2	0.378	21	266.5	55.2	228.3	43.9
B44			0.354	16	385.2	65.9	326.9	59.8
B45			0.329	10	590.2	74.4	574.8	78.8
Crushed ag. 10/20
B11	0.5	1.2	0.378	21	212.3	48.3	229.2	43.9
B12			0.354	19	275.6	57.1	276.5	50.2
B13			0.329	15	349.1	60.3	385.6	62.9
B14			0.308	13	420.4	64.3	481.6	69.3

(b)


Type of superplasticizer	Concretes	W/C	A/S	Sp (%)	Slump (cm)

A1 (polycarboxylate modified)	B1Ad.0	0.5	1.2	0	15	464.5	59.4	62.9
	B1Ad.0.2			0.2	17	483.2	55.2	53.1
	B1Ad.0.4			0.4	19	452.9	42.6	43.2
	B1Ad.0.6			0.6	20	423.9	39.7	36.6
	B1Ad.0.8			0.8	21	289.0	27.0	29.9

A2 (polycarboxylate modified)	B1Ad.0	0.5	1.2	0	15	464.5	59.4	62.9
	B1Ad.0.2			0.2	17	445.8	46.2	49.6
	B1Ad.0.4			0.4	20	427.2	30.8	33.1
	B1Ad.0.45			0.45	21	403.9	33.0	28.1

A3 (phosphonate modified)	B1Ad.0	0.5	1.2	0	15	464.5	59.4	62.9
	B1Ad.0.2			0.2	16	456.5	53.2	56.3
	B1Ad.0.4			0.4	19	477.7	49.2	43.2
	B1Ad.0.6			0.6	21	385.0	36.5	33.4
	B1Ad.0.8			0.8	22	372.3	29.2	26.7

A4 (polycarboxylate modified)	B1Ad.0	0.5	1.2	0	15	464.5	59.4	62.9
	B1Ad.0.2			0.2	16	456.5	53.2	55.1
	B1Ad.0.4			0.4	19	440.4	54.3	40.9
	B1Ad.0.6			0.6	20	447.4	33.7	33.1
	B1Ad.0.8			0.8	22	282.5	17.4	22.1

A5 (polycarboxylate modified)	B1Ad.0	0.5	1.2	0	15	464.5	59.4	62.9
	B1Ad.0.2			0.2	16	456.5	53.2	56.3
	B1Ad.0.4			0.4	18	409.1	39.6	46.4
	B1Ad.0.6			0.6	21	394.4	32.5	33.4
	B1Ad.0.8			0.8	24	274.2	10.2	20.4