The Properties of Lightweight Aggregates Pre-Coated with Cement Pastes and Their Suitability for Concrete

One of the biggest technological problems connected with the production of lightweight concretes made of porous aggregates is their much higher water absorption, which may cause on the one hand workability loss, and on the other hand excess water content in concrete. The aim of this research was to...

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Autores principales:	Lucyna Domagała, Ewa Bryła
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	lightweight aggregate aggregate impregnation sintered fly ash expanded clay lightweight concrete oven dry density Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/fed6d38d3bfd4250b11f2fc2879a8aec
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spelling	oai:doaj.org-article:fed6d38d3bfd4250b11f2fc2879a8aec2021-11-11T17:59:38ZThe Properties of Lightweight Aggregates Pre-Coated with Cement Pastes and Their Suitability for Concrete10.3390/ma142164171996-1944https://doaj.org/article/fed6d38d3bfd4250b11f2fc2879a8aec2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6417https://doaj.org/toc/1996-1944One of the biggest technological problems connected with the production of lightweight concretes made of porous aggregates is their much higher water absorption, which may cause on the one hand workability loss, and on the other hand excess water content in concrete. The aim of this research was to assess the effect of impregnation of lightweight aggregates (LWAs) with cement paste on their properties and to verify its effectiveness in concretes. Three types of lightweight aggregates differing in porosity and pore structure (sintered fly ash Lytag, expanded clay: Leca and Liapor) were selected for the tests. The following parameters were taken into consideration in the research program: LWA type and size, LWA initial moisture content, strength, and rheology of cement pastes. The tests of 22 different aggregates, plain and coated with cement paste, included density, crushing strength, and development of water absorption in time. The research program proved that porous aggregates, due to their impregnation with cement pastes, may be effectively sealed and strengthened. All tested LWAs showed a considerable decrease in water absorption by up to 71%. However, only Lytag aggregate showed a visibly enhanced crushing strength. Verification of effectiveness of aggregate sealing on the enhancement of concrete properties showed both a considerable reduction in water absorption of composites (by up to 52%) and a very high increase in their strength (by up to 107%).Lucyna DomagałaEwa BryłaMDPI AGarticlelightweight aggregateaggregate impregnationsintered fly ashexpanded claylightweight concreteoven dry densityTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6417, p 6417 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	lightweight aggregate aggregate impregnation sintered fly ash expanded clay lightweight concrete oven dry density Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	lightweight aggregate aggregate impregnation sintered fly ash expanded clay lightweight concrete oven dry density Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Lucyna Domagała Ewa Bryła The Properties of Lightweight Aggregates Pre-Coated with Cement Pastes and Their Suitability for Concrete
description	One of the biggest technological problems connected with the production of lightweight concretes made of porous aggregates is their much higher water absorption, which may cause on the one hand workability loss, and on the other hand excess water content in concrete. The aim of this research was to assess the effect of impregnation of lightweight aggregates (LWAs) with cement paste on their properties and to verify its effectiveness in concretes. Three types of lightweight aggregates differing in porosity and pore structure (sintered fly ash Lytag, expanded clay: Leca and Liapor) were selected for the tests. The following parameters were taken into consideration in the research program: LWA type and size, LWA initial moisture content, strength, and rheology of cement pastes. The tests of 22 different aggregates, plain and coated with cement paste, included density, crushing strength, and development of water absorption in time. The research program proved that porous aggregates, due to their impregnation with cement pastes, may be effectively sealed and strengthened. All tested LWAs showed a considerable decrease in water absorption by up to 71%. However, only Lytag aggregate showed a visibly enhanced crushing strength. Verification of effectiveness of aggregate sealing on the enhancement of concrete properties showed both a considerable reduction in water absorption of composites (by up to 52%) and a very high increase in their strength (by up to 107%).
format	article
author	Lucyna Domagała Ewa Bryła
author_facet	Lucyna Domagała Ewa Bryła
author_sort	Lucyna Domagała
title	The Properties of Lightweight Aggregates Pre-Coated with Cement Pastes and Their Suitability for Concrete
title_short	The Properties of Lightweight Aggregates Pre-Coated with Cement Pastes and Their Suitability for Concrete
title_full	The Properties of Lightweight Aggregates Pre-Coated with Cement Pastes and Their Suitability for Concrete
title_fullStr	The Properties of Lightweight Aggregates Pre-Coated with Cement Pastes and Their Suitability for Concrete
title_full_unstemmed	The Properties of Lightweight Aggregates Pre-Coated with Cement Pastes and Their Suitability for Concrete
title_sort	properties of lightweight aggregates pre-coated with cement pastes and their suitability for concrete
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/fed6d38d3bfd4250b11f2fc2879a8aec
work_keys_str_mv	AT lucynadomagała thepropertiesoflightweightaggregatesprecoatedwithcementpastesandtheirsuitabilityforconcrete AT ewabryła thepropertiesoflightweightaggregatesprecoatedwithcementpastesandtheirsuitabilityforconcrete AT lucynadomagała propertiesoflightweightaggregatesprecoatedwithcementpastesandtheirsuitabilityforconcrete AT ewabryła propertiesoflightweightaggregatesprecoatedwithcementpastesandtheirsuitabilityforconcrete
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The Properties of Lightweight Aggregates Pre-Coated with Cement Pastes and Their Suitability for Concrete

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