Methods for determining and tracking the residual cement paste content of recycled concrete

Perry M.F. van de Wouw; Miruna V.A. Florea; H.J.H. (Jos) Brouwers

Methods for determining and tracking the residual cement paste content of recycled concrete

Perry M.F. van de Wouw
, Miruna V.A. Florea
, H.J.H. (Jos) Brouwers

Building Materials

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

14 Downloads (Pure)

Abstract

The attached cement paste on recycled concrete aggregates (RCA) is the main factor causing impaired quality of the new concrete. Since attached mortar is not as hard or strong as natural aggregates, its presence
weakens the overall performance of the RCA. Additionally, the attached mortar is known to cause a higher water absorption, an increased water cement ratio, and therefore a more porous and weaker concrete.
Due to the negative influence of the attached mortar on the RCA properties, ideally all mortar should be removed from the original natural aggregates, returning the recycled concrete into its original aggregates and hardened cement paste (HCP). In order to study the efficiency of treatments designed to achieve this purpose, methods for estimating the amount of HCP attached to the original aggregates need to be used. Such methods, which include e.g. composition tests (XRF, XRD), thermogravimetric analysis or chemical
methods are generally time-consuming and complex. In this study, a more straightforward method based on oxide composition is proposed and corroborated with the results from other test results.

Original language	English
Title of host publication	Proceedings ICSBM 2019 Volume 4
Editors	V. Caprai, H.J.H. Brouwers
Pages	226-233
Number of pages	8
Publication status	Published - 12 Aug 2019
Event	2nd International Conference of Sustainable Building Materials, ICSBM 2019 - Einhoven University of Technology, Eindhoven , Netherlands Duration: 12 Aug 2019 → 15 Aug 2019 Conference number: 2

Conference

Conference	2nd International Conference of Sustainable Building Materials, ICSBM 2019
Abbreviated title	ICSBM 2019
Country/Territory	Netherlands
City	Eindhoven
Period	12/08/19 → 15/08/19

Keywords

Recycled concrete
oxide composition
hardened cement paste
cement content
aggregates

Cite this

@inproceedings{4d2e201ff2d54411b881effcbbfbf82f,

title = "Methods for determining and tracking the residual cement paste content of recycled concrete",

abstract = "The attached cement paste on recycled concrete aggregates (RCA) is the main factor causing impaired quality of the new concrete. Since attached mortar is not as hard or strong as natural aggregates, its presence weakens the overall performance of the RCA. Additionally, the attached mortar is known to cause a higher water absorption, an increased water cement ratio, and therefore a more porous and weaker concrete. Due to the negative influence of the attached mortar on the RCA properties, ideally all mortar should be removed from the original natural aggregates, returning the recycled concrete into its original aggregates and hardened cement paste (HCP). In order to study the efficiency of treatments designed to achieve this purpose, methods for estimating the amount of HCP attached to the original aggregates need to be used. Such methods, which include e.g. composition tests (XRF, XRD), thermogravimetric analysis or chemical methods are generally time-consuming and complex. In this study, a more straightforward method based on oxide composition is proposed and corroborated with the results from other test results. ",

keywords = "Recycled concrete, oxide composition, hardened cement paste, cement content, aggregates",

author = "\{van de Wouw\}, \{Perry M.F.\} and Florea, \{Miruna V.A.\} and Brouwers, \{H.J.H. (Jos)\}",

year = "2019",

month = aug,

day = "12",

language = "English",

pages = "226--233",

editor = "V. Caprai and H.J.H. Brouwers",

booktitle = "Proceedings ICSBM 2019 Volume 4",

note = "2nd International Conference of Sustainable Building Materials, ICSBM 2019, ICSBM 2019 ; Conference date: 12-08-2019 Through 15-08-2019",

}

Methods for determining and tracking the residual cement paste content of recycled concrete. / van de Wouw, Perry M.F.; Florea, Miruna V.A.; Brouwers, H.J.H. (Jos).
Proceedings ICSBM 2019 Volume 4. ed. / V. Caprai; H.J.H. Brouwers. 2019. p. 226-233 ID 155.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

TY - GEN

T1 - Methods for determining and tracking the residual cement paste content of recycled concrete

AU - van de Wouw, Perry M.F.

AU - Florea, Miruna V.A.

AU - Brouwers, H.J.H. (Jos)

N1 - Conference code: 2

PY - 2019/8/12

Y1 - 2019/8/12

N2 - The attached cement paste on recycled concrete aggregates (RCA) is the main factor causing impaired quality of the new concrete. Since attached mortar is not as hard or strong as natural aggregates, its presence weakens the overall performance of the RCA. Additionally, the attached mortar is known to cause a higher water absorption, an increased water cement ratio, and therefore a more porous and weaker concrete. Due to the negative influence of the attached mortar on the RCA properties, ideally all mortar should be removed from the original natural aggregates, returning the recycled concrete into its original aggregates and hardened cement paste (HCP). In order to study the efficiency of treatments designed to achieve this purpose, methods for estimating the amount of HCP attached to the original aggregates need to be used. Such methods, which include e.g. composition tests (XRF, XRD), thermogravimetric analysis or chemical methods are generally time-consuming and complex. In this study, a more straightforward method based on oxide composition is proposed and corroborated with the results from other test results.

AB - The attached cement paste on recycled concrete aggregates (RCA) is the main factor causing impaired quality of the new concrete. Since attached mortar is not as hard or strong as natural aggregates, its presence weakens the overall performance of the RCA. Additionally, the attached mortar is known to cause a higher water absorption, an increased water cement ratio, and therefore a more porous and weaker concrete. Due to the negative influence of the attached mortar on the RCA properties, ideally all mortar should be removed from the original natural aggregates, returning the recycled concrete into its original aggregates and hardened cement paste (HCP). In order to study the efficiency of treatments designed to achieve this purpose, methods for estimating the amount of HCP attached to the original aggregates need to be used. Such methods, which include e.g. composition tests (XRF, XRD), thermogravimetric analysis or chemical methods are generally time-consuming and complex. In this study, a more straightforward method based on oxide composition is proposed and corroborated with the results from other test results.

KW - Recycled concrete

KW - oxide composition

KW - hardened cement paste

KW - cement content

KW - aggregates

M3 - Conference contribution

SP - 226

EP - 233

BT - Proceedings ICSBM 2019 Volume 4

A2 - Caprai, V.

A2 - Brouwers, H.J.H.

T2 - 2nd International Conference of Sustainable Building Materials, ICSBM 2019

Y2 - 12 August 2019 through 15 August 2019

ER -

Methods for determining and tracking the residual cement paste content of recycled concrete

Abstract

Conference

Keywords

Fingerprint

Cite this