Influence of the type of coarse lightweight aggregate on properties of Semi-Lightweight Self-Consolidating Concrete

Jacek Kwasny, Mohamed Sonebi, Susan Taylor, Yun Bai, Kieran Owens, William Doherty

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)

    Abstract

    This paper presents studies on the properties of fresh and hardened semilightweight self-consolidating concrete (SLWSCC) mixtures, produced with two types of manufactured coarse lightweight aggregates (LWA) and normal weight sand. The first type, a sintered pulverized fuel ash, was made from an industrial by-product, fly ash, whereas the second one, an expanded clay, was produced from a naturally sourced clay. For all mixtures, normal weight sand was used as a fine fraction of aggregates, and the portland cement was partially replaced with a limestone powder. The SLWSCC was produced with different water presaturation regimes of the LWAs. The desired initial slump-flow spread was set between 700 and 800 mm. The effect of three superplasticizers was evaluated by testing properties of SLWSCC, normal weight SCC, and paste mixtures. Three SCC fresh properties were measured: the slump-flow, the V-funnel flow time, and the J-ring blocking step. Moreover, the slump-flow loss was evaluated. The degree of segregation was assessed in both fresh and hardened states. Additionally, the hardened density and the compressive strengths were tested. All SLWSCC mixtures were produced with a desired range of slump-flow spread and with satisfactory passing ability assessed with the J-ring test. SLWSCCs prepared with the expanded clay LWA were less sensitive to the variation of water presaturation levels and showed lower viscosity than those made with the sintered pulverized fuel ash LWA. Only mixtures containing SP-3 superplasticizer showed acceptable workability loss resistance. The saturated surface-dry density of all of the mixtures varied in a range of 2,025–2,125??kg/m 3 . Mixtures containing 29% of coarse LWAs and 71% of sand (by mass) had 24-h and 28-day compressive strengths above 20 and 40 MPa, respectively, but the mixtures made with the expanded clay were slightly weaker.
    Original languageEnglish
    Pages (from-to)1474-1483
    Number of pages10
    JournalASCE Journal of Materials in Civil Engineering
    Volume24
    Issue number12
    Early online date27 May 2012
    DOIs
    Publication statusPublished - Dec 2012

    Keywords

    • Compressive strength; density; lightweight self-consolidating concrete; J-ring; slump-flow; V-funnel; water absorption

    ASJC Scopus subject areas

    • Building and Construction
    • Civil and Structural Engineering
    • Materials Science(all)
    • Mechanics of Materials

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