Optimization and mechanical-physical characterization of geopolymers with Construction and Demolition Waste (CDW) aggregates for construction products

被引：33

作者：

Panizza, Matteo ^{[1
]}

Natali, Marco ^{[1
]}

Garbin, Enrico ^{[2
]}

Ducman, Vilma ^{[3
]}

Tamburini, Sergio ^{[1
]}

机构：

[1] Natl Res Council Italy CNR, Inst Condensed Matter Chem & Technol Energy ICMAT, Corso Stati Uniti 4, I-35127 Padua, Italy

[2] Univ Padua, Interdept Res Ctr Study Cement Mat & Hydraul Bind, Via G Gradenigo 6, I-35131 Padua, Italy

[3] Slovenian Natl Bldg & Civil Engn Inst ZAG, Dimiceva Ulica 12, Ljubljana 1000, Slovenia

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2020年 / 264卷

基金：

欧盟地平线“2020”;

关键词：

Geopolymers; Alkali-Activated Materials (AAM); Construction and Demolition Waste (CDW); Building Materials; Recycled Aggregates; Mortar; Concrete; Compressive strength; Tensile strength; Shrinkage; INTERFACIAL TRANSITION ZONES; RECYCLED CLAY BRICK; BLAST-FURNACE SLAG; C-AND-D; COMPRESSIVE STRENGTH; CONCRETE STRENGTH; RAW-MATERIALS; FLY-ASH; BEHAVIOR; MICROSTRUCTURE;

D O I：

10.1016/j.conbuildmat.2020.120158

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The paper presents the mechanical and physical characterization of a metakaolin-slag-fly ash-potassium silicate geopolymer mortar embedding inorganic recycled aggregates from Construction and Demolition Waste (CDW). The binder was holistically optimized to comply with the pilot plant requirements for producing architectural panels of satisfactory quality, among them: reduced viscosity, minimum open time of 1 h, use of commercial reagents, sufficient strength and limited shrinkage. Size and aspect ratio of small scale cylindrical specimens were investigated in compression, comparing the performance of tested geopolymers to available provisions for natural rocks, cement concrete and mortars. Empirical correlations between compressive and splitting tensile strength were calibrated through the results of about 130 geopolymer mixtures produced in former and current activities. Lastly, the suitability of reusing geopolymers at their end-of-life as recycled aggregates in a new geopolymer production was preliminarily assessed to explore the feasibility of a closed-loop process. (C) 2020 The Authors. Published by Elsevier Ltd.

引用

页数：17

共 76 条

[1] Production of geopolymeric binder from blended waste concrete powder and fly ash [J].