1 Introduction
2 Lab-Based Experiment
2.1 Experimental Plan
Mixture conditions | Test items | ||
---|---|---|---|
w/cma | 0.50 | Fresh state | Slump Air content |
Unit water content (kg/m3) | 220 | ||
S/ab | 0.55 | Hardened state | Compressive strength (@ 7, 28 days) Flexural strength (@ 7, 28 days) Tensile strength (@ 7, 28 days) Impact of high-velocity projectile |
Target slump (mm) | 150 ± 20 | ||
Target air content (%) | 4.5 ± 1.5 | ||
Binder composition (by weight) | OPC:BS:FA = 7:2:1 | ||
Fiber content (%)c | 1 | ||
Fiber combination | SF only PF only SF + PF |
2.2 Materials and Sample Preparation
Aggregate | Specific gravity | Fineness modulus (FM) | Unit volume weight (kg/m3) |
---|---|---|---|
Fine aggregate | 2.57 | 2.57 | 1840 |
Coarse aggregate | 2.71 | 6.78 | 1570 |
Fiber | Aspect ratio | Length (mm) | Diameter (mm) | Tensile strength (MPa) |
---|---|---|---|---|
Steel fiber (SF) | 66 | 35 | 0.53 | 1108 |
Polyaramid fiber (PF) | 61 | 30 | 0.49 | 623 |
Mixturea | w/bb | Fiber content (%) | S/ac | SPd (%/B) | Unit weight (kg/m3) | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
W
|
C
|
FA
|
BS
|
S
|
G
|
SF
|
PF
| |||||
SF | 0.50 | 1 | 0.55 | 0.7 | 220 | 293 | 44 | 88 | 829 | 693 | 79 | 0 |
PF | 220 | 293 | 44 | 88 | 829 | 693 | 0 | 11 | ||||
SF + PF | 220 | 293 | 44 | 88 | 829 | 693 | 39 | 5 |
2.3 Test Methods
3 Results of Lab-Based Experiment and Discussion
3.1 Fresh Properties
3.2 Mechanical Properties
3.3 Protecting Performance
4 Field Applications
4.1 Field Conditions for Site and Mixtures
4.2 Test Methods
4.3 Results of Field Applications
Experimental conditionsa | Slump (mm) | Slump flow (mm) | Air content (%) |
---|---|---|---|
The first test | |||
Before pumping | 130 | 225/220 | 4.0 |
After pumping | 170 | 240/300 | 3.6 |
The second test | |||
Before pumping | 135 | 230/240 | 3.8 |
After pumping | 160 | 310/280 | 3.5 |
Experimental conditionsa | Compressive strength (MPa) | |
---|---|---|
7-day age | 28-day age | |
The first test | ||
Before pumping | 20.9 | 30.9 |
After pumping | 23.8 | 32.7 |
The second test | ||
Before pumping | 21.8 | 31.0 |
After pumping | 24.2 | 33.1 |