Hardness correlation length in a self-compacting concrete

Junges, Bruna Maria Becker; Ficher, Nadine Machado; Kosteski, Luis Eduardo; Marangon, Ederli

doi:10.1590/S1983-41952020000400001

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Revista IBRACON de Estruturas e Materiais

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ORIGINAL ARTICLE • Rev. IBRACON Estrut. Mater. 13 (4) • 2020 • https://doi.org/10.1590/S1983-41952020000400001 copy

Hardness correlation length in a self-compacting concrete

Comprimento de correlação da dureza em um concreto autoadensável

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

This paper presents an experimental study of spatial variation of hardness or indentation strength of a self-compacting concrete. With the pourpose of validation, the comparison between the used methodologies with the values obtained by numerical simulation is presented. The correlation length (Lcor) obtained on the semivariogram using a Gaussian model is similar to the numerically simulated value, especially when the distance between the measurements is less than the sought Lcor. Using sclerometry, it was possible to infer that to find the value of concrete correlation length it is necessary to measure nearby points, at ca. 2cm apart. With this scheme, the value of Lcor found is close to the obtained using macro-indentation, a more complex and time-consuming procedure. Finally, for the studied self-compacting concrete, the correlation length is equivalent to a value between 5 to 6 times the maximum aggregate size.

Keywords:
spatial distribution; self-compacting concrete; hardness; indentation

Materials	kg/m³
Portland Cement	400
Water	200
Superplasticizer additive	2,40
Fine aggregate	731
Coarse aggregate	904

Point Nº	x (cm)	y (cm)	SI
1	3.25	3.68	29
2	13.69	3.30	34
3	21.87	3.10	32
4	8.33	8.15	32
5	19.15	8.13	34
6	3.76	11.91	34
7	12.45	12.83	32
8	18.75	12.83	38
9	6.48	18.64	31
10	18.03	16.99	28
11	22.05	18.82	30
12	13.87	21.44	28
Mean			32.00
k			0.97
SI _mean			31.04

Coordinates	x1	x2	x3	x4	x5	x6	x7	x8	x9
y1	23	34	30	32	28	31	32	28	30
y2	27	27	32	33	30	35	31	30	29
y3	28	29	28	34	33	32	33	28	26
y4	28	31	37	33	37	30	36	30	26
y5	30	37	37	34	32	32	36	32	26
y6	24	30	34	31	32	40	32	34	34
y7	23	32	31	37	35	31	29	28	28
y8	31	29	31	28	26	30	34	28	30
y9	23	26	27	27	30	29	32	25	27

IBRACON - Instituto Brasileiro do Concreto Instituto Brasileiro do Concreto (IBRACON), Av. Queiroz Filho, nº 1700 sala 407/408 Torre D, Villa Lobos Office Park, CEP 05319-000, São Paulo, SP - Brasil, Tel. (55 11) 3735-0202, Fax: (55 11) 3733-2190 - São Paulo - SP - Brazil
E-mail: arlene@ibracon.org.br

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[1] Corresponding author: Luis Eduardo Kosteski. E-mail: luiskosteski@unipampa.edu.br

Coordinates	x1	x2	x3	x4	x5	x6	x7	x8	x9
y1	23	34	30	32	28	31	32	28	30
y2	27	27	32	33	30	35	31	30	29
y3	28	29	28	34	33	32	33	28	26
y4	28	31	37	33	37	30	36	30	26
y5	30	37	37	34	32	32	36	32	26
y6	24	30	34	31	32	40	32	34	34
y7	23	32	31	37	35	31	29	28	28
y8	31	29	31	28	26	30	34	28	30
y9	23	26	27	27	30	29	32	25	27

Coordinates	x1	x2	x3	x4	x5	x6	x7	x8	x9
y1	23	34	30	32	28	31	32	28	30
y2	27	27	32	33	30	35	31	30	29
y3	28	29	28	34	33	32	33	28	26
y4	28	31	37	33	37	30	36	30	26
y5	30	37	37	34	32	32	36	32	26
y6	24	30	34	31	32	40	32	34	34
y7	23	32	31	37	35	31	29	28	28
y8	31	29	31	28	26	30	34	28	30
y9	23	26	27	27	30	29	32	25	27

Coordinates	x1	x2	x3	x4	x5	x6	x7	x8	x9
y1	23	34	30	32	28	31	32	28	30
y2	27	27	32	33	30	35	31	30	29
y3	28	29	28	34	33	32	33	28	26
y4	28	31	37	33	37	30	36	30	26
y5	30	37	37	34	32	32	36	32	26
y6	24	30	34	31	32	40	32	34	34
y7	23	32	31	37	35	31	29	28	28
y8	31	29	31	28	26	30	34	28	30
y9	23	26	27	27	30	29	32	25	27