Non-Metallic Reinforcements with Different Moduli of Elasticity and Surfaces for Concrete Structures

Sandor SOLYOM; Matteo DI BENEDETTI; Anna SZIJÁRTÓ; György L. BALÁZS

doi:10.21307/acee-2018-025

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Non-Metallic Reinforcements with Different Moduli of Elasticity and Surfaces for Concrete Structures

Architecture, Civil Engineering, Environment

Volume 11 (2018): Issue 2 (June 2018)

By: Sandor SOLYOM, Matteo DI BENEDETTI, Anna SZIJÁRTÓ and György L. BALÁZS

Open Access

|Apr 2019

Figures & Tables

Table 1.

Mechanical characteristics of concrete mixes (MPa)

Symbol	Compressive str.		Splitting tensile str.
	Avg.	St.D.	Avg.	St.D.
C1	39.14	1.26	2.91	0.36
C2	48.80	1.10	3.40	0.33
C3	54.21	1.50	3.72	0.19
S1	67.16	3.57	4.13	0.08

**Schematic representation of the pull-out specimen**

**Left: CFRP and GFRP sand coated bars prepared with 5Ø (Ø – bar diameter) embedment length. Right: pull-out test setup**

Table 2.

Pull-out test results, CFRP sand coated #3 (9.52 mm diameter) bars

Symbol		Bond strength				Loaded end slip				Free end slip				Bond stiffness
		τ_b,max	Avg.	St.D.	C.O.V.	Slip^a	Avg.	St.D.	C.O.V.	Slip^a	Avg.	St.D.	C.O.V.	Avg.
		(MPa)	(MPa)	(MPa)	(%)	(mm)	(mm)	(mm)	(%)	(mm)	(mm)	(mm)	(%)	(N/mm³)
C1	1	19.82	19.31	1.27	6.5	0.261	0.234	0.034	14.5	0.130	0.100	0.038	38.2	82.61
	2	20.25				0.196				0.112
	3	17.86				0.245				0.057
C2	1	14.30	15.57	1.54	9.9	0.163	0.259	0.125	48.1	0.038	0.051	0.011	22.5	60.18
	2	17.29				0.213				0.054
	3	15.14				0.400				0.060
C3	1	12.60	15.95	4.74	29.7	0.291	0.245	0.065	26.5	0.067	0.065	0.004	5.5	65.15
C3	2	19.30	15.95	4.74	29.7	0.199	0.245	0.065	26.5	0.062	0.065	0.004	5.5	65.15
S1	1	16.47	16.30	0.97	6.0	0.358	0.260	0.095	36.4	0.036	0.038	0.002	5.4	62.58
	2	15.25				0.254				0.039
	3	17.18				0.169				0.040

1 Notes:

2a Slip corresponding to bond strength

Table 3.

Pull-out test results, GFRP sand coated #3 (9.52 mm diameter) bars

Symbol		Bond strength				Loaded end slip				Free end slip				Bond stiffness
		τ_b,max	Avg.	St.D.	C.O.V.	Slip^a	Avg.	St.D.	C.O.V.	Slip^a	Avg.	St.D.	C.O.V.	Avg.
		(MPa)	(MPa)	(MPa)	(%)	(mm)	(mm)	(mm)	(%)	(mm)	(mm)	(mm)	(%)	(N/mm³)
C1	1	12.87	14.11	4.26	30.2	0.397	0.406	0.156	38.3	0.038	0.075	0.052	69.5	34.76
	2	18.85				0.566				0.134
	3	10.60				0.255				0.052
C2	1	9.54	9.16	0.74	8.1	0.255	0.256	0.069	27.0	0.040	0.026	0.012	48.0	35.74
	2	8.30				0.188				0.022
	3	9.63				0.326				0.016
C3	1	8.21	13.03	6.82	52.3	0.238	0.374	0.192	51.4	0.034	0.054	0.028	52.4	34.87
C3	2	17.86	13.03	6.82	52.3	0.509	0.374	0.192	51.4	0.074	0.054	0.028	52.4	34.87
S1	1	9.24	10.97	2.44	22.3	0.297	0.297	0.001	0.2	0.044	0.057	0.018	32.3	36.98
	2	12.70	10.97	2.44	22.3	0.296	0.297	0.001	0.2	0.070	0.057	0.018	32.3	36.98

3 Notes:

4a Slip corresponding to bond strength

Table 5.

Pull-out test results for Series 2

Symbol		Bond strength				Loaded end slip				Free end slip				Bond stiffness
		τ_b,max	Avg.	St.D.	C.O.V.	Slip^a	Avg.	St.D.	C.O.V.	Slip^a	Avg.	St.D.	C.O.V.	Avg.
		(MPa)	(MPa)	(MPa)	(%)	(mm)	(mm)	(mm)	(%)	(mm)	(mm)	(mm)	(%)	(N/mm³)
Sand coated	1	23.24	23.01	0.57	2.5	0.718	0.638	0.088	13.7	0.266	0.247	0.024	9.8	36.05
	2	22.36				0.545				0.256
	3	23.43				0.652				0.220
Indented type	1	20.02	18.91	1.17	6.2	0.581	0.606	0.148	24.4	0.317	0.319	0.068	21.3	31.19
	2	17.69				0.473				0.252
	3	19.03				0.765				0.388
Indented type 2	1	11.21	12.25	1.29	10.5	1.138	1.198	0.103	8.6	0.957	0.917	0.069	7.5	10.23
	2	11.84				1.138				0.957
	3	13.69				1.316				0.838

5 Notes:

6a Slip corresponding to bond strength

**Effect of modulus of elasticity of FRP bars on bond strength in concrete**

Table 4.

Analysis of variance (ANOVA) between bond strength results of CFRP and GFRP bars

Concrete mix	Significance level (%)
C1	11.2
C2	3.9
C3	29.7
S1	8.3

**Bond stress-slip relationships of GFRP bars with different surface profiles**

**Effect of surface profile of GFRP bars on bond strength. Eccentricity (left) and centric (right) pull-out test**

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Articles in this issue

DOI: https://doi.org/10.21307/acee-2018-025 | Journal eISSN: 2720-6947 (formerly 1899-0142) | Journal ISSN: 1899-0142

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Language: English

Page range: 79 - 88

Submitted on: Jun 25, 2017

Accepted on: Mar 16, 2018

Published on: Apr 4, 2019

Published by: Silesian University of Technology

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

Bond,

Bond strength,

Concrete strength,

FRP internal reinforcement,

Modulus of elasticity,

Surface profile

Related subjects:

Architecture and design,

Architecture,

Architects, buildings

© 2019 Sandor SOLYOM, Matteo DI BENEDETTI, Anna SZIJÁRTÓ, György L. BALÁZS, published by Silesian University of Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Volume 11 (2018): Issue 2 (June 2018)

Non-Metallic Reinforcements with Different Moduli of Elasticity and Surfaces for Concrete Structures

Figures & Tables

Table 1.

Figure 1.

Figure 2.

Table 2.

Table 3.

Table 5.

Figure 3.

Table 4.

Figure 4.

Figure 5.

Paradigm

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