At present, chemical admixtures are usually added in concrete mixtures when all ingredients are mixed together either by one-time input or in batches for various purposes. The present study proposes a new method for lightweight aggregate (LWA) concrete or combined aggregate concrete, wherein porous and hydrophilic LWA are presoaked in chemical admixture solution with the appropriate concentration. Poly carboxylic acid-based-super plasticizer and setting retarder were prepared and added individually in combined aggregate concrete in different ways as follows: (1) one-time direct admixing into a concrete mixer; (2) blending in concrete mixture in batches; and (3) absorbing into LWA particles in advance. Time-dependent slump and setting times of concrete mixtures were investigated, which proved that chemical admixtures can be stored in porous aggregate particles beforehand by means of presoaking. LWA, with the internal pores as sustained-release capsules, become temporary carriers of water and chemical admixtures. Once relative humidity in the concrete mixture falls, the molecules of chemical admixtures gradually move out with water migration to play a persistent part in, for example, successful slump loss reduction or setting time adjustment.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Carrier and Delayed Release Properties of Lightweight Aggregates for Chemical Admixtures


    Beteiligte:
    Chen, Yu (Autor:in) / Deng, Yi-fan (Autor:in) / Liu, Yang (Autor:in)


    Erscheinungsdatum :

    15.09.2016


    Format / Umfang :

    72016-01-01 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Unbekannt



    Rheological Characteristics of Wet-Mix Shotcrete Mixtures with Crushed Aggregates and Mineral Admixtures

    Yun, Kyong-Ku / Choi, Pangil / Yeon, Jung Heum | Springer Verlag | 2017


    Rheological Characteristics of Wet-Mix Shotcrete Mixtures with Crushed Aggregates and Mineral Admixtures

    Yun, Kyong-Ku / Choi, Pangil / Yeon, Jung Heum | Online Contents | 2018


    Soil stabilisation by use of chemical admixtures

    Sherwood, P.T. | Engineering Index Backfile | 1961


    Lightweight Fly Ash-Plastic Aggregates in Concrete

    Jansen, Daniel C. | Online Contents | 2001


    Lightweight material carrier

    LUKE MICHAEL SMITH / DANIEL MARK FINFER | Europäisches Patentamt | 2024

    Freier Zugriff