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Abstract: A high-performance concrete (HPC) is required to have superior performance in various aspects such as workability, strength, durability, dimensional stability, segregation stability, and passing ability. The mix design of HPC is rather complicated because the number of ingredients in HPC is usually more than those in conventional concrete and some of the required properties are conflicting with each other in the sense that improvement in one property would at the same time cause impairment of another property. However, there is still lack of understanding regarding how the various mix parameters should be optimised for achieving best overall performance. Most practitioners are still conducting mix design primarily through trial concrete mixing, which is laborious, ineffective, and often unable to timely respond to fluctuations in the properties of raw materials. To address these issues, the authors have been developing the packing and film thickness theories of concrete materials, in order to revamp the mix design philosophy of HPC in terms of the water film thickness (WFT), paste film thickness (PFT), and mortar film thickness (MFT) in the concrete. Based on the findings from an extensive experimental programme, suitable ranges of WFT, PFT, and MFT have been recommended.

基于填充理论和膜厚度理论的高性能混凝土配合比设计

[1]Aïtcin, P.C., 1998. High-Performance Concrete. E & FN Spon, London, UK, p.591.

[2]Anderegg, F.O., 1931. Grading aggregates II: the application of mathematical formulas to mortars. Industrial and Engineering Chemistry, 23(9):1058-1064.

[3]Banfill, P.F.G., 1994. Rheological methods for assessing the flow properties of mortar and related materials. Construction and Building Materials, 8(1):43-50.

[4]BSI (British Standards Institution), 2000. BS 410: Test Sieves– Technical Requirements and Testing. Part 2: Test Sieves of Perforated Metal Plate. BSI, UK.

[5]BSI (British Standards Institution), 2005. BS EN 196: Methods of Testing Cement. Part 3: Determination of Setting Time and Soundness. BSI, UK.

[6]BSI (British Standards Institution), 2009a. BS EN 934: Admixtures for Concrete, Mortar and Grout. Part 2: Concrete Admixtures–Definitions, Requirements, Conformity, Marking and Labelling. BSI, UK.

[7]BSI (British Standards Institution), 2009b. BS EN 12390: Testing Hardened Concrete. Part 3: Compressive Strength of Test Specimens. BSI, UK.

[8]BSI (British Standards Institution), 2010a. BS EN 12350: Testing Fresh Concrete. Part 8: Self-compacting Concrete –Slump-flow Test. BSI, UK.

[9]BSI (British Standards Institution), 2010b. BS EN 12350: Testing Fresh Concrete. Part 9: Self-compacting Concrete –V-funnel Test. BSI, UK.

[10]BSI (British Standards Institution), 2010c. BS EN 12350: Testing Fresh Concrete. Part 11: Self-compacting Concrete–Sieve Segregation Test. BSI, UK.

[11]BSI (British Standards Institution), 2011. BS EN 197: Cement. Part 1: Composition, Specifications and Conformity Criteria for Common Cements. BSI, UK.

[12]BSI (British Standards Institution), 2013. BS EN 12620: Aggregates for Concrete. BSI, UK.

[13]BSI (British Standards Institution), 2016. BS EN 196: Methods of Testing Cement. Part 1: Determination of Strength. BSI, UK.

[14]Claisse, P.A., Lorimer, P., Omari, M.A., 2001. Workability of cement pastes. ACI Materials Journal, 98(6):476-482.

[15]De Larrard, F., 1999. Concrete Mixture Proportioning: A Scientific Approach. E & FN Spon, London & New York, p.421.

[16]De Schutter, G., Poppe, A.M., 2004. Quantification of the water demand of sand in mortar. Construction and Building Materials, 18(7):517-521.

[17]Domone, P., 2006. Mortar tests for self-consolidating concrete. Concrete International, 28(4):39-45.

[18]Ferraris, C.F., Obla, K.H., Hill, R., 2001. The influence of mineral admixtures on the rheology of cement paste and concrete. Cement and Concrete Research, 31(2):245-255.

[19]Fung, W.W.S., Ng, P.L., Kwan, A.K.H., 2009a. Effects of superplasticizer on flowability and cohesiveness of mortar. Proceedings, Materials Science and Technology in Engineering Conference, HKIE, Hong Kong, China, p.160-168.

[20]Fung, W.W.S., Kwan, A.K.H., Wong, H.H.C., 2009b. Wet packing of crushed rock fine aggregate. Materials and Structures, 42(5):631-643.

[21]Furnas, C.C., 1931. Grading aggregates I: mathematical relations for beds of broken solids of maximum density. Industrial and Engineering Chemistry, 23(9):1052-1058.

[22]Helmuth, R.A., 1980. Structure and rheology of fresh cement paste. 7th International Congress of Chemistry of Cement, Paris, France, Sub-theme VI-0, p.16-30.

[23]Kwan, A.K.H., Wong, H.H.C., 2007. Water film thickness: a fundamental parameter governing rheology of self-consolidating concrete. Proceedings, 1st Cross-Strait Conference on Concrete Technology, Taiwan, China, p.63-74.

[24]Kwan, A.K.H., Wong, H.H.C., 2008. Effects of packing density, excess water and solid surface area on flowability of cement paste. Advances in Cement Research, 20(1):1-11.

[25]Kwan, A.K.H., Ng, I.Y.T., 2008. Performance criteria for self-consolidating concrete. Transactions, Hong Kong Institution of Engineers, 15(2):35-41.

[26]Kwan, A.K.H., Ng, I.Y.T., 2009. Optimum superplasticiser dosage and aggregate proportions for SCC. Magazine of Concrete Research, 61(4):281-292.

[27]Kwan, A.K.H., Fung, W.W.S., 2010. Concrete science for high-performance concrete: packing density, water film thickness and particle interactions. Proceedings, Asia Conference on Ecstasy in Concrete 2010, Chennai, India.

[28]Kwan, A.K.H., Li, L.G., 2011. Water film thickness and paste film thickness: key factors for mix design of high-performance concrete. Proceedings, International RILEM Conference on Advances in Construction Materials through Science and Engineering, Hong Kong, China, p.793-801.

[29]Kwan, A.K.H., Li, L.G., 2012. Combined effects of water film thickness and paste film thickness on rheology of mortar. Materials and Structures, 45(9):1359-1374.

[30]Kwan, A.K.H., Li, L.G., 2014. Combined effects of water film, paste film and mortar film thicknesses on fresh properties of concrete. Construction and Building Materials, 50:598-608.

[31]Kwan, A.K.H., Ling, S.K., 2015. Lowering paste volume of SCC through aggregate proportioning to reduce carbon footprint. Construction and Building Materials, 93: 584-594.

[32]Kwan, A.K.H., Fung, W.W.S., Wong, H.H.C., 2010a. Water film thickness, flowability and rheology of cement-sand mortar. Advances in Cement Research, 22(1):3-14.

[33]Kwan, A.K.H., Ng, P.L., Fung, W.W.S., 2010b. Research directions for high-performance concrete. Proceedings, Infrastructure Solutions for Tomorrow, HKIE Civil Division Conference 2010, Hong Kong, China.

[34]Kwan, A.K.H., Li, L.G., Fung, W.W.S., 2012. Wet packing of blended fine and coarse aggregate. Materials and Structures, 45(6):817-828.

[35]Kwan, A.K.H., Ng, P.L., Huen, K.Y., 2014. Effects of fines content on packing density of fine aggregate in concrete. Construction and Building Materials, 61:270-277.

[36]Lachemi, M., Hossain, K.M.A., Patel, R., et al., 2007. Influence of paste/mortar rheology on the flow characteristics of high-volume fly ash self-consolidating concrete. Magazine of Concrete Research, 59(7):517-528.

[37]Li, L.G., Kwan, A.K.H., 2011a. Wet packing of particles in concrete and a three-tier mix design method for self-consolidating concrete. Proceedings, 9th International Symposium on High Performance Concrete, Rotorua, New Zealand.

[38]Li, L.G., Kwan, A.K.H., 2011b. Mortar design based on water film thickness. Construction and Building Materials, 25(5):2381-2390.

[39]Li, L.G., Kwan, A.K.H., 2013. Concrete mix design based on water film thickness and paste film thickness. Cement and Concrete Composites, 39:33-42.

[40]Li, L.G., Kwan, A.K.H., 2014. Packing density of concrete mix under dry and wet conditions. Powder Technology, 253:514-521.

[41]Li, L.G., Kwan, A.K.H., 2015. Effects of superplasticizer type on packing density, water film thickness and flowability of cement paste. Construction and Building Materials, 86:113-119.

[42]Li, Y., Chen, J.J., Kwan, A.K.H., 2013. Roles of water film thickness in fresh and hardened properties of mortar. Advances in Cement Research, 25(3):171-182.

[43]Ling, S.K., Kwan, A.K.H., 2015. Adding ground sand to decrease paste volume, increase cohesiveness and improve passing ability of SCC. Construction and Building Materials, 84:46-53.

[44]Mehdipour, I., Khayat, K.H., 2016. Effect of supplementary cementitious material content and binder dispersion on packing density and compressive strength of sustainable cement paste. ACI Materials Journal, 113(3):361-372.

[45]Miyake, J.I., Matsushita, H., 2007. Evaluation method for consistencies of mortars with various mixture proportions. Journal of Advanced Concrete Technology, 5(1):87-97.

[46]Nanthagopalan, P., Haist, M., Santhanam, M., et al., 2008. Investigation on the influence of granular packing on the flow properties of cementitious suspensions. Cement and Concrete Composites, 30(9):763-768.

[47]Neville, A.M., 2011. Properties of Concrete, 5th Edition. Pearson Education, Harlow & New York, p.846.

[48]Neville, A.M., Brooks, J.J., 2010. Concrete Technology, 2nd Edition. Prentice Hall, Harlow & New York, p.442.

[49]Ng, I.Y.T., Wong, H.H.C., Kwan, A.K.H., 2006. Passing ability and segregation stability of self-consolidating concrete with different aggregate proportions. Magazine of Concrete Research, 58(7):447-457.

[50]Ng, I.Y.T., Fung, W.W.S., Kwan, A.K.H., 2008. Effects of coarse aggregate grading on performance of self-consolidating concrete. Proceedings, 3rd North American Conference on the Design and Use of Self-consolidating Concrete (SCC 2008), Chicago, USA.

[51]Ng, I.Y.T., Ng, P.L., Kwan, A.K.H., 2009a. Rheology of mortar and its influences on performance of self-consolidating concrete. Key Engineering Materials, 400-402:421-426.

[52]Ng, I.Y.T., Fung, W.W.S., Ng, P.L., et al., 2009b. Significance of mortar film thickness to the workability of SCC. Proceedings, 2nd International Symposium on Design, Performance and Use of Self-consolidating Concrete (SCC 2009), Beijing, China, p.277-286.

[53]Oh, S.G., Noguchi, T., Tomosawa, F., 1999. Toward mix design for rheology of self-compacting concrete. 1st International RILEM Symposium on Self-compacting Concrete, RILEM Publications SARL, Stockholm, Sweden, p.361-372.

[54]Okamura, H., Ouchi, M., 2003. Self-compacting concrete. Journal of Advanced Concrete Technology, 1(1):5-15.

[55]Park, C.K., Noh, M.H., Park, T.H., 2005. Rheological properties of cementitious materials containing mineral admixtures. Cement and Concrete Research, 35(5):842-849.

[56]Powers, T.C., 1968. The Properties of Fresh Concrete. John Wiley & Sons, New York, USA, p.664.

[57]Reddy, B.V.V., Gupta, A., 2008. Influence of sand grading on the characteristics of mortars and soil-cement block masonry. Construction and Building Materials, 22(8):1614-1623.

[58]Russell, H.G., 1999. ACI defines high-performance concrete. Concrete International, 21(2):56-57.

[59]Wong, H.H.C., Kwan, A.K.H., 2005. Packing density: a key concept for mix design of high performance concrete. Proceedings, Materials Science and Technology in Engineering Conference, HKIE, Hong Kong, China, p.1-15.

[60]Wong, H.H.C., Kwan, A.K.H., 2008a. Packing density of cementitious materials: measurement and modelling. Magazine of Concrete Research, 60(3):165-175.

[61]Wong, H.H.C., Kwan, A.K.H., 2008b. Packing density of cementitious materials: part 1-measurement using a wet packing method. Materials and Structures, 41(4):689-701.

[62]Wong, H.H.C., Kwan, A.K.H., 2008c. Rheology of cement paste: role of excess water to solid surface area ratio. Journal of Materials in Civil Engineering, 20(2):189-197.

[63]Zhang, T., Yu, Q., Wei, J., et al., 2011. A new gap-graded particle size distribution and resulting consequences on properies of blended cement. Cement and Concrete Composites, 33(5):543-550.