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

被引:18
作者
Domagala, Lucyna [1 ]
Bryla, Ewa [1 ]
机构
[1] Cracow Univ Technol, Fac Civil Engn, PL-31155 Krakow, Poland
关键词
lightweight aggregate; aggregate impregnation; sintered fly ash; expanded clay; lightweight concrete; oven dry density; water absorption; compressive strength; STRENGTH; DURABILITY; MICROSTRUCTURE; ZONE;
D O I
10.3390/ma14216417
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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%).
引用
收藏
页数:22
相关论文
共 52 条
[1]   Investigation of physical and mechanical properties of mortars produced by polymer coated perlite aggregate [J].
Akyuncu, Veysel ;
Sanliturk, Firat .
JOURNAL OF BUILDING ENGINEERING, 2021, 38
[2]   Influence of lignocellulosic aggregate coating with paraffin wax on flax shive and cement-shive composite properties [J].
Al-Mohamadawi, Ali ;
Benhabib, Karim ;
Dheilly, Rose-Marie ;
Goullieux, Adeline .
CONSTRUCTION AND BUILDING MATERIALS, 2016, 102 :94-104
[3]   Application of expanded perlite encapsulated bacteria and growth media for self-healing concrete [J].
Alazhari, Mohamed ;
Sharma, Trupti ;
Heath, Andrew ;
Cooper, Richard ;
Paine, Kevin .
CONSTRUCTION AND BUILDING MATERIALS, 2018, 160 :610-619
[4]   Estimation of water absorbed by expanding clay aggregates during structural lightweight concrete production [J].
Alexandre Bogas, J. ;
Gomes, Augusto ;
Gloria Gomes, M. .
MATERIALS AND STRUCTURES, 2012, 45 (10) :1565-1576
[5]   Impregnation and encapsulation of lightweight aggregates for self-healing concrete [J].
Alghamri, R. ;
Kanellopoulos, A. ;
A-Tabbaa, A. .
CONSTRUCTION AND BUILDING MATERIALS, 2016, 124 :910-921
[6]  
[Anonymous], 2020, 2062013A12016FPRA2 E
[7]  
[Anonymous], 2009, 1239032019 EN EUR CO
[8]  
[Anonymous], 2016, 130552016 EN EUR COM
[9]  
[Anonymous], 1993, Structural Lightweight Aggregate Concrete
[10]  
[Anonymous], 2019, 1235052019 EN EUR CO