Studying the role of fine materials characteristics on the packing density and rheological properties of blended cement pastes

Ibrahim, Reham Moharem; Ahmad, Seleem S. E.; Ghazal, Ahmed I.; Al-kroom, Hussein; Elrahman, Mohamed Abd

doi:10.1515/arh-2025-0035

Figures & Tables

Measurement of flow spread of different cement pastes.

Schleibinger Viskomat NT to measure rheological characteristics.

Rheometer set up and procedure for determination of visco-elastic properties. (a) Rotational speed vs time protocol; (b) moment of resistance of measurements for the control paste; (c) regression line for torque vs rotational speed and (d) conversion of torque and rotational speed measurements into shear stress and shear rate using a ffine translation.

Packing densities of different pastes using De Larrard method.

Packing densities of different pastes using the Centrifugal method.

Flow spread of different pastes including different mineral admixtures.

Yield stress and plastic viscosity of cement pastes.

The relationship between yield stress vs WFT.

Relationship between flow and yield stress.

Physical and chemical characteristics of the used mineral admixtures

Notation	OPC	CFA	FFA	SL	SF	CLP	MLP	FLP	CQP	MQP	FQP
Loss of ignition (%)	2.9	3.05	2.85	0	1.96	42.84	43.28	39.77	0.14	0.28	0.14
SiO₂ (%)	19.9	47.91	52.71	34.7	87.68	0.9	0.55	6.96	92.63	91.6	96.79
Al₂O₃ (%)	4.6	21.01	25.61	12.35	0.27	0.27	0.21	1.21	<0.20	0.34	<0.20
Fe₂O₃ (%)	3.1	4.57	5.62	0.58	<0.30	0.22	<0.20	0.54	<0.30	<0.30	<0.30
MgO (%)	1.7	1.38	2.21	6.11	0.36	0.4	0.41	1.89	<0.05	<0.05	<0.05
CaO (%)	65	4.79	5.19	39.76	0.17	55.33	55.33	49.43	<0.10	<0.10	<0.10
Na₂Oeq (%)	0.31	1.45	3.10	0.72	0.36	—	—	0.18	—	—	—
SO₃ (%)	3	0.84	1.29	1.57	0.22	<0.05	<0.05	<0.05	<0.05	<0.05	<0.05
Density (ρ) (g/cm³)	3.17	2.35	2.55	2.91	2.31	2.75	2.76	2.73	2.67	2.68	2.65
Baline (cm²/g)	3,521	3.616	7.286	3.975	—	3,450	5.234	12.955	3.697	5.256	10.645
Calculated SSA (cm²/g)	3529.5	4064.4	10,022	4187.8	143,248	3,550	5,300	10,634	3859.2	4699.1	10,306

Composition and results of PD of different mixes kg/m3

Mix	Mix composition												Water demand	Excess water	PD (%)		WFT (µm)	Fresh density (t/m³)
Mix	OPC	CFA	FFA	SL	SF	CLP	MLP	FLP	CQP	MQP	FQP		Water demand	Excess water	De La.	Cen.	WFT (µm)	Fresh density (t/m³)
Control	100											3529.5	0.758	0.322	55.7	56.876	2.959	2.019
CFA10	90	10										3583.0	0.733	0.315	56.3	57.7	2.918	1.987
CFA20	80	20										3636.5	0.719	0.298	56.7	58.2	2.784	1.940
CFA30	70	30										3690.0	0.697	0.291	57.3	58.9	2.748	1.914
CFA40	60	40										3743.5	0.684	0.276	57.7	59.4	2.638	1.876
CFA50	50	50										3797.0	0.670	0.263	58.1	59.9	2.551	1.844
FFA10	90		10									4178.7	0.739	0.320	56.9	57.5	2.521	2.004
FFA20	80		20									4827.9	0.730	0.307	57.8	57.8	2.132	1.977
FFA30	70		30									5477.1	0.712	0.304	58.5	58.4	1.897	1.956
FFA40	60		40									6126.4	0.703	0.293	59.2	58.7	1.668	1.927
FFA50	50		50									6775.6	0.698	0.279	59.9	58.9	1.460	1.907
SL10	90			10								3566.6	0.760	0.314	55.7	56.8	2.865	2.011
SL20	80			20								3603.6	0.763	0.305	56.1	56.7	2.770	2.001
SL30	70			30								3640.7	0.761	0.300	56.3	56.8	2.718	1.982
SL40	60			40								3677.7	0.764	0.292	56.6	56.7	2.629	1.971
SL50	50			50								3714.8	0.764	0.285	56.8	56.7	2.559	1.964
SF3	97				3							7721.1	0.733	0.337	57.5	57.7	1.422	2.008
SF6	94				6							11912.6	0.720	0.339	58.0	58.1	0.936	1.983
SF9	91				9							16104.2	0.729	0.320	58.3	57.8	0.658	1.968
SF12	88				12							20295.7	0.722	0.316	57.6	58.1	0.520	1.945
SF15	85				15							24487.3	0.763	0.265	57.1	56.7	0.365	1.929
CLP10	90					10						3521.6	0.743	0.324	57.3	57.5	3.013	2.010
CLP20	80					20						3513.6	0.715	0.340	58.1	58.4	3.201	2.008
CLP30	70					30						3505.7	0.705	0.337	59.2	58.3	3.220	1.970
CLP40	60					40						3497.7	0.686	0.344	60.6	59.0	3.331	1.959
CLP50	50					50						3489.8	0.660	0.358	61.5	59.7	3.516	1.948
MLP10	90						10					3696.6	0.748	0.320	56.9	57.2	2.832	2.008
MLP20	80						20					3863.6	0.739	0.316	57.4	57.5	2.707	1.989
MLP30	70						30					4030.7	0.720	0.323	57.8	58.1	2.682	1.971
MLP40	60						40					4197.7	0.708	0.323	58.3	58.5	2.605	1.956
MLP50	50						50					4364.8	0.692	0.327	58.8	59.1	2.567	1.935
FLP10	90							10				4240.0	0.739	0.328	56.1	57.5	2.531	2.006
FLP20	80							20				4950.4	0.718	0.335	56.7	58.2	2.242	1.982
FLP30	70							30				5660.9	0.724	0.316	57.2	58.0	1.874	1.966
FLP40	60							40				6371.4	0.712	0.315	57.7	58.4	1.679	1.939
FLP50	50							50				7081.8	0.720	0.295	58.1	58.2	1.432	1.916
CQP10	90								10			3562.5	0.743	0.321	55.9	57.4	2.960	2.005
CQP20	80								20			3595.5	0.738	0.310	56.5	57.5	2.870	1.987
CQP30	70								30			3628.4	0.731	0.301	57.0	57.8	2.800	1.969
CQP40	60								40			3661.4	0.717	0.300	57.5	58.2	2.806	1.953
CQP50	50								50			3694.3	0.715	0.287	58.0	58.3	2.698	1.933
MQP10	90									10		3646.5	0.752	0.312	55.8	57.1	2.807	2.005
MQP20	80									20		3763.4	0.735	0.313	56.2	57.6	2.768	1.985
MQP30	70									30		3880.4	0.737	0.296	56.6	57.6	2.575	1.966
MQP40	60									40		3997.4	0.729	0.289	57.0	57.8	2.475	1.939
MQP50	50									50		4114.3	0.726	0.278	57.5	57.9	2.344	1.924
FQP10	90										10	4207.2	0.745	0.318	56.1	57.3	2.484	2.006
FQP20	80										20	4884.8	0.737	0.309	56.5	57.6	2.109	1.977
FQP30	70										30	5562.4	0.737	0.293	55.8	57.6	1.782	1.959
FQP40	60										40	6240.0	0.754	0.259	55.7	57.0	1.427	1.940
FQP50	50										50	6917.6	0.786	0.213	55.1	56.0	1.072	1.902

Studying the role of fine materials characteristics on the packing density and rheological properties of blended cement pastes

Figures & Tables

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Physical and chemical characteristics of the used mineral admixtures

Composition and results of PD of different mixes kg/m3

Paradigm

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