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Chinese Journal of Materials Research  2014, Vol. 28 Issue (1): 59-66    DOI: 10.11901/1005.3093.2013.493
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Preparation and Properties of Reactive Powder Concrete with Circulating Fluidized Bed Combustion Fly Ash
Yan GAO,Shuzhen LV(),Zhongyuan LU,Jun LI,Dan ZHANG
State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010
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Yan GAO,Shuzhen LV,Zhongyuan LU,Jun LI,Dan ZHANG. Preparation and Properties of Reactive Powder Concrete with Circulating Fluidized Bed Combustion Fly Ash. Chinese Journal of Materials Research, 2014, 28(1): 59-66.

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Abstract  

The mix proportion design of reactive powder concrete (RPC) with circulating fluidized bed combustion (CFBC) fly ash was done through orthogonal design. The effect of curing system on strength and shrinkage property of RPC with CFBC fly ash, and the effect of CFBC fly ash on shrinkage property of RPC were investigated. The results show that RPC which could have flexural strength of 26 MPa and compressive strength of 140 MPa was prepared by using CFBC fly ash, silica fume, superplasticizer, intermediate quartz sand, PO42.5R and hydrothermal curing treatment; Hydrothermal curing can promote the hydration of RPC with CFBC fly ash and form a relatively dense structure, so its early strength was higher than that of standard curing about 30 MPa, but high temperature made early-formed AFt transform into AFm, so later strength was decreased; Compared to standard curing, Hydrothermal curing promoted the early shrinkage of RPC with CFBC fly ash, reduced the late drying shrinkage, but its overall shrinkage rate was still greater than that of standard curing; The expansibility characteristics of CFBC fly ash can effectively reduce the large self-shrinkage of RPC.
Key words:  inorganic non-metallic material      CFBC fly ash      RPC      curing system      strength      shrinkage rate     
Received:  12 July 2013     
Fund: *Supported by National Key Technology R&D Program for the 12th Five-Year Plan of China No. 2011BAA04B04 (11zg410105), and the Key Technology R&D Program of Sichuan Province No. 11zs2116.
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Yan GAO
Shuzhen LV
Zhongyuan LU
Jun LI
Dan ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.493     OR     https://www.cjmr.org/EN/Y2014/V28/I1/59

Material Loss SiO2 Al2O3 Fe2O3 CaO MgO SO3 f-CaO
Cement 4.98 21.51 5.33 3.18 61.63 2.68 3.30 —
CFBC fly ash 4.50 45.22 15.39 12.02 10.70 1.92 10.72 1.21
Silica fume 6.38 87.65 0.37 0.08 0.44 1.47 — —
Table1  Chemical composition of raw materials (mass fraction, %)
Fig.1  XRD pattern of CFBC fly ash
Level Factor (the ratio of factor to cementing material)
Water-binder ratio(A) Silica fume(B)/% CFBC fly ash(C)/% Intermediate quartz sand(D) Superplasticizer(E) /%
1 0.2 0 0 0.8 0.5
2 0.18 5 5 1.0 0.8
3 0.22 10 10 1.2 1.0
4 0.17 15 15 1.4 1.5
Table 2  Experiment factor and levels
No. Factor 7 d strength/MPa 28 d strength/MPa
A B C D E Flexural strength Compressive strength Flexural strength Compressive strength
1 1 1 1 1 1 18.9 93.2 18.3 103.5
2 1 2 2 2 2 17.2 92.1 18.7 103.6
3 1 3 3 3 3 15.7 94.6 19.7 114.6
4 1 4 4 4 4 13.8 80.9 17.2 114.3
5 2 1 2 3 4 15.3 70.6 15.7 90.2
6 2 2 1 4 3 19.2 100.8 20.5 120.5
7 2 3 4 1 2 18.9 109.9 22.7 132.2
8 2 4 3 2 1 12.5 96.7 17.3 98.8
9 3 1 3 4 2 12.7 60.6 12.5 71.3
10 3 2 4 3 1 15.1 94.1 19.0 115.2
11 3 3 1 2 4 8.9 47.9 10.3 60.0
12 3 4 2 1 3 11.2 69.2 14.6 81.4
13 4 1 4 2 3 20.2 109.6 22.9 115.6
14 4 2 3 1 4 15.8 78.9 17.9 97.2
15 4 3 2 4 1 12.0 90.6 13.9 97.4
16 4 4 1 3 2 17.1 95.7 21.3 114.9
Table 3  Orthogonal test and results
Fig.2  Diagram of sum of strength (K) and content of each factors, (a) the sum of 7d flexural strength, (b) the sum of 28d flexural strength, (c) the sum of 7d compressive strength, (d) the sum of 28d compressive strength (A-water-binder ratio, B-silica fume, C-CFBC fly ash, D-intermediate quartz sand, E-superplasticizer
No. Proportioning (The ratio of factor to cementing material) 7 d strength /MPa 28 d strength /MPa Curing type
Water-binder ratio Silica fume/% CFBC fly ash/% Intermediate quartz sand Superplasticize/% Flexural strength Compressive strength Flexural strength Compressive strength
BZ 0.18 5 15 1.2 1.0 21.3 109.7 23.4 130.3 standard curing
R60 26.2 132.5 24.8 132.1 60℃ hot water curing
R90 26.1 139.3 24.7 134.4 90℃ hot water curing
Z60 26.4 133.2 24.4 132.8 60℃ steam curing
Z90 26.0 140.8 23.4 135.0 90℃ steam curing
Table 4  Strength of RPC with CFBC fly ash under different curing systems
Fig.3  SEM images of RPC with CFBC fly ash hydrated for 7 d under different curing systems, (a) BZ, (b) R60
Fig.4  Shrinkage rate (a) and dry shrinkage rate (b) of RPC with CFBC fly ash under different curing systems
Fig.5  XRD patterns of RPC with CFBC fly ash hydrated for 3 d under different curing systems
Fig.6  DTA (a) and DTG (b) analysis of RPC with CFBC fly ash hydrated for 7 d under different curing systems
No. Cementing material proportion/% Shrinkage rate/%
Cement Silica fume CFBC fly ash 3 d 6 d 14 d 28 d 45 d 70 d 90 d 230 d
RPC1 80 5 15 0.0128 0.0060 -0.0038 -0.0092 -0.0230 -0.0322 -0.0644 -0.0639
RPC2 80 20 0 -0.0054 -0.0208 -0.0260 -0.0360 -0.0497 -0.0626 -0.0838 -0.0830
RPC3 95 5 0 0.0067 -0.0034 -0.0056 -0.0113 -0.0248 -0.0380 -0.0650 -0.0648
Table 5  Cementing material proportion and shrinkage rate of RPC
Fig.7  Shrinkage rate of three groups RPC
Fig.8  SEM images of three groups RPC hydrated for 7 d, (a) RPC1, (b) RPC2, (c) RPC3
Fig.9  XRD patterns of three groups RPC hydrated for 3 d
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