1. Department of Transportation Engineering, School of Civil Engineering, Shandong University, Jinan 250061, China 2. Department of Civil, Environment, and Construction Engineering, Texas Tech University, TX 79409-1023, USA
The fast-track repair of deteriorated concrete pavement requires materials that can be placed, cured, and opened to the traffic in a short period. Type III cement and Calcium Sulfoaluminate (CSA) cement are the most commonly used fast-setting hydraulic cement (FSHC). In this study, the properties of Type III and CSA cement concrete, including compressive strength, coefficient of thermal expansion (CTE) and shrinkage were evaluated. The test results indicate that compressive strength of FSHC concrete increased rapidly at the early age. CSA cement concrete had higher early-age and long term strength. The shrinkage of CSA cement concrete was lower than that of Type III cement concrete. Both CSA and Type III cement concrete had similar CTE values. Based on the laboratory results, the CSA cement was selected as the partial-depth rapid repair material for a distressed continuously reinforced concrete pavement. The data collected during and after the repair show that the CSA cement concrete had good short-term and long-term performances and, therefore, was suitable for the rapid repair of concrete pavement.
. [J]. Frontiers of Structural and Civil Engineering, 2017, 11(3): 338-345.
Yanhua GUAN, Ying GAO, Renjuan SUN, Moon C. WON, Zhi GE. Experimental study and field application of calcium sulfoaluminate cement for rapid repair of concrete pavements. Front. Struct. Civ. Eng., 2017, 11(3): 338-345.
SiO 2 Al2O3 Fe2O3 CaO MgO Na2O SO3 Loss on Ignition Insoluble Residue
15.4 13.7 2.4 50.9 1.3 0.6 12.5 2.8 0.8
20.7 4.5 4.1 64.8 1.2 0.32 2.8 1.4 0.2
Tab.1
sieve size/inch (mm)
percentage passing by mass (%)
2 (20.8)
100
1½ (38.1)
95
¾ (19.05)
75
½ (12.7)
45
No. 4 (4.75)
5
Tab.2
property
coarse aggregate
fine aggregate
dry rodded unit weight (kg/m 3)
2603
N/A
absorption (%)
1.4
1.8
specific gravity
2.60
2.55
fineness modulus
N/A
2.6
Tab.3
component
5 sacks of cement
6 sacks of cement
7 sacks of cement
W/C
0.45
0.50
0.55
0.45
0.50
0.55
0.45
0.50
0.55
cement content
470 (279)
470 (279)
470 (279)
564 (335)
564 (335)
564 (335)
658 (391)
658 (391)
658 (391)
coarse aggregate
1595 (947)
1595 (947)
1595 (947)
1595 (947)
1595 (947)
1595 (947)
1595 (947)
1595 (947)
1595(947)
fine aggregate
1663 (987)
1588 (942)
1513 (898)
1447 (859)
1357 (805)
1268 (753)
1420 (843)
1337 (793)
1022 (607)
water
211.5 (126)
235 (139)
258.5 (153)
253.8 (151)
282 (167)
310.2 (184)
296.1 (176)
329 (195)
361.9 (215)
HRWR (oz)/(g)
90 (2551)
45 (1275)
0
90 (2551)
36 (1021)
0
90 (2551)
36 (1021)
0
retarder (oz)/(g)
9.5 (269)
9.5 (269)
9.5 (269)
11 (105)
11 (105)
11 (105)
13 (143)
13 (143)
13 (143)
Tab.4
component
6 sacks of cement
6.5 sacks of cement
cement
564 (335)
611 (361)
coarse aggregate
1595 (947)
1595 (947)
fine aggregate
1635 (966)
1543 (912)
water
253.8 (151)
275 (163)
HRWR(oz)/(g)
90 (2551)
90 (2551)
Tab.5
Fig.1
Fig.2
Fig.3
Fig.4
Fig.5
Fig.6
Fig.7
Fig.8
Fig.9
Fig.10
Fig.11
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