Effect of Mixing Procedure on Pumping Properties of High-Performance Concrete

Abstract

Abstract: The effects of mixing durations (120, 210, 300 s) and superplasticizer addition methods (direct or delayed) on rheological properties, pressure bleeding rates, and lubrication layer characteristics of high-performance concrete (HPC) were investigated. And the effects of mixing procedures on pumping properties of HPC were further evaluated. The results show that the flowability of HPC is enhanced by properly prolonging the mixing duration and the delayed addition of superplasticizer. Besides, it needs a longer mixing time to reach the optimum flowability state for mixtures with a larger paste to aggregate ratio. In a certain range, the increasing mixing duration reduces the pumping pressure loss of HPC, but it increases the pressure bleeding rate of HPC, reduces stability of HPC during pumping and increases potential risk of blockage during pumping. Under different mixing procedures, both the viscosity constant of lubrication layer and the bleeding volume at 140 s are well correlated with the pumping pressure loss of HPC, serving as reliable indicators to evaluate the pumping performance of HPC.

Key words: mixing procedure, high-performance concrete, rheological property, pumping property, workability, lubrication layer

CLC Number:

TU528

SHEN Wenkai, YUAN Qiang, JI Youhong, ZENG Rong, LI Wei, LI Fumin, SHI Caijun. Effect of Mixing Procedure on Pumping Properties of High-Performance Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 878-887.

References

[1] JIAO D W, SHI C J, YUAN Q, et al. Effect of constituents on rheological properties of fresh concrete:a review[J]. Cement and Concrete Composites, 2017, 83: 146-159.
[2] 元强, 李白云, 史才军, 等. 混凝土泵送性能的流变学表征及预测综述[J]. 材料导报, 2018, 32(17): 2976-2985.
YUAN Q, LI B Y, SHI C J, et al. An overview on the prediction and rheological characterization of pumping concrete[J]. Materials Review, 2018, 32(17): 2976-2985 (in Chinese).
[3] KWON S H, JANG K P, KIM J H, et al. State of the art on prediction of concrete pumping[J]. International Journal of Concrete Structures and Materials, 2016, 10: 75-85.
[4] 刘豫, 史才军, 焦登武, 等. 新拌水泥基材料的流变特性、模型和测试研究进展[J]. 硅酸盐学报, 2017, 45(5): 708-716.
LIU Y, SHI C J, JIAO D W, et al. Rheological properties, models and measurements for fresh cementitious materials: a short review[J]. Journal of the Chinese Ceramic Society, 2017, 45(5): 708-716 (in Chinese).
[5] 李立辉, 陈喜旺, 李路明, 等. 自密实混凝土泵送压力变化规律分析[J]. 施工技术, 2016, 45(12): 52-56.
LI L H, CHEN X W, LI L M, et al. Analysis on the changes of pumping pressure of self-compacting concrete in pipes[J]. Construction Technology, 2016, 45(12): 52-56 (in Chinese).
[6] 汪东波. 高性能混凝土的流变性及泵送压力损失研究[D]. 重庆: 重庆大学, 2015.
WANG D B. Study on rheological property and pumping pressure loss of high-performance concrete[D]. Chongqing: Chongqing University, 2015 (in Chinese).
[7] KAPLAN D, LARRARD F, SEDRAN T. Design of concrete pumping circuit[J]. ACI Materials Journal, 2005, 102(2): 110-117.
[8] CHOI M, ROUSSEL N, KIM Y, et al. Lubrication layer properties during concrete pumping[J]. Cement and Concrete Research, 2013, 45: 69-78.
[9] FEYS D, KHAYAT K H, PEREZ-SCHELL A, et al. Prediction of pumping pressure by means of new tribometer for highly-workable concrete[J]. Cement and Concrete Composites, 2015, 57: 102-115.
[10] KAPLAN D, LARRARD F, SEDRAN T. Avoidance of blockages in concrete pumping process[J]. ACI Materials Journal, 2005, 102(3): 183-191.
[11] ROUSSEL N, OVARLEZ G, GARRAULT S, et al. The origins of thixotropy of fresh cement pastes[J]. Cement and Concrete Research, 2012, 42(1): 148-157.
[12] KHAYAT KH, ASSAAD JJ. Effect of w/cm and high-range water-reducing admixture on formwork pressure and thixotropy of self-consolidating concrete[J]. ACI Materials Journal, 2006, 103(3): 183-193.
[13] DILS J, SCHUTTER G, BOEL V. Influence of mixing procedure and mixer type on fresh and hardened properties of concrete: a review[J].Materials and Structures, 2012, 45(11): 1673-1683.
[14] MAZANEC O, LOWKE D, SCHIESSEL P. Mixing of high performance concrete: effect of concrete composition and mixing intensity on mixing time[J]. Materials and structures, 2010, 43(3): 357-365.
[15] SCHIESSEL P, MAZANEC O, LOWKE D. SCC and UHPC: effect of mixing technology on fresh concrete properties[C]//Advances in Construction Materials 2007. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007: 513-522.
[16] 申文凯, 元强, 纪友红, 等.剪切速率和温度对低水胶比水泥浆流变性能的影响[J]. 硅酸盐通报, 2023, 42(1): 48-56.
SHEN W K, YUAN Q, JI Y H, et al. Effect of shearing and temperature on the rheology of cement paste with low water-to-binder ratio[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(1):48-56 (in Chinese).
[17] CHEN C T, STRUBLE L J. Influence of mixing sequence on cement-admixture interaction[J]. ACI Materials Journal, 2009, 106(6): 503-532.
[18] ESMAEILKHANIAN B, KHAYAT K H, YAHIA A, et al. Effects of mix design parameters and rheological properties on dynamic stability of self-consolidating concrete[J]. Cement and Concrete Composites, 2014, 54: 21-28.
[19] HEIRMAN G, VANDEWALLE L, et al. Integration approach of the Couette inverse problem of powder type self-compacting concrete in a wide-gap concentric cylinder rheometer[J]. Journal of non-Newtonian fluid mechanics, 2008, 150(2-3): 93-103.
[20] DE LARRARD F, FERRARIS F, SEDRAN T. Fresh concrete: a Herschel-Bulkley material[J]. Materials and structures, 1998, 31(7): 494-498.
[21] NGO T, KADRI H, BENNACER R, et al. Use of tribometer to estimate interface friction and concrete boundary layer composition during the fluid concrete pumping[J]. Construction and Building Materials, 2010, 24(7): 1253-1261.
[22] SHEN W K, SHI C J, KHAYAT K, et al. Change in fresh properties of high-strength concrete due to pumping[J]. Construction and Building Materials, 2021, 300: 124069.
[23] YAMMINE J, CHAOUCHE M, GUERINET M, et al. From ordinary rhelogy concrete to self compacting concrete: a transition between frictional and hydrodynamic interactions[J]. Cement and Concrete Research, 2008, 38(7): 890-896.
[24] FERNÀNDEZ-ALTABLE V, CASANOVA I. Influence of mixing sequence and superplasticiser dosage on the rheological response of cement pastes at different temperatures[J]. Cement and Concrete Research, 2006, 36(7): 1222-1230.
[25] ROUSSEL N. A thixotropy model for fresh fluid concretes: theory, validation and applications[J]. Cement and Concrete Research, 2006, 36(10): 1797-1806.
[26] FLATT R J, HOUST Y. A simplified view on chemical effects perturbing the action of superplasticizers[J]. Cement and concrete research, 2001, 31(8): 1169-1176.
[27] KIM J S, KWON S H, JANG K P, et al. Concrete pumping prediction considering different measurement of the rheological properties[J]. Construction and Building Materials, 2018, 171: 493-503.
[28] VANHOVE Y, KHAYAT K H. Forced bleeding test to assess stability of flowable concrete[J]. ACI Materials Journal, 2016, 113(6): 753-758.
[29] SECRIERU E, COTARDO D, MECHTCHERINE V, et al. Changes in concrete properties during pumping and formation of lubricating material under pressure[J]. Cement and Concrete Research, 2018, 108: 129-139.
[30] PARK C K, JANG K P, JEONG J H, et al. Suggestion of a model for filling coefficient of hydraulic cylinder in concrete pump[J]. Journal of the Korean Recycled Construction Resources Institute, 2016, 4(2): 195-202.
[31] FEYS D, KHAYAT K H, KHATIB R. How do concrete rheology, tribology, flow rate and pipe radius influence pumping pressure?[J]. Cement and Concrete Composites, 2016, 66: 38-46.
[32] ROGER D, PHILLIP B. Tests to establish concrete pumpability[J]. ACI Journal Proceedings, 1977, 74(5): 193-203.