轻质骨料对泡沫混凝土性能的影响及其内养护机制

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (10): 3413-3419.

轻质骨料对泡沫混凝土性能的影响及其内养护机制

熊远亮^1,2, 刘超¹, 邓智聪¹, 陈春¹, 张亚梅¹

1.东南大学材料科学与工程学院,江苏省土木工程材料重点实验室,南京 211189;
2.烟台大学土木工程学院,烟台 264005

收稿日期:2022-05-23 修回日期:2022-07-26 出版日期:2022-10-15 发布日期:2022-10-26
通讯作者: 张亚梅,博士,教授。E-mail:ymzhang@seu.edu.cn
作者简介:熊远亮(1989—),男,博士。主要从事泡沫混凝土的研究。E-mail:xiongyuanl@163.com
基金资助:
国家自然科学基金(51972057)

Effects of Lightweight Aggregates on Properties of Foamed Concrete and Internal Curing Mechanism

XIONG Yuanliang^1,2, LIU Chao¹, DENG Zhicong¹, CHEN Chun¹, ZHANG Yamei¹

1. Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;
2. School of Civil Engineering, Yantai University, Yantai 264005, China

Received:2022-05-23 Revised:2022-07-26 Online:2022-10-15 Published:2022-10-26

摘要/Abstract

摘要： 为降低泡沫混凝土干燥收缩,采用轻质骨料(页岩陶粒及粉煤灰陶粒)制备泡沫混凝土,研究了轻质骨料对泡沫混凝土抗压强度、干燥收缩、内部湿度及孔结构等的影响,并分析了轻质骨料的内养护机制。结果表明,轻质骨料能够调节泡沫混凝土的内部湿度,约束基体的变形,降低泡沫混凝土的干燥收缩。而轻质骨料也会在泡沫混凝土中引入缺陷,导致其强度降低。轻质骨料中大于100 nm的墨水瓶孔是内养护效果的控制因素,大于100 nm的墨水瓶孔数量越多,轻质骨料释水能力越强,内养护效果越好,制备的泡沫混凝土干燥收缩越小。

关键词: 泡沫混凝土, 轻质骨料, 内养护, 干燥收缩, 内部湿度, 孔结构

Abstract: In order to mitigate the drying shrinkage of foamed concrete, lightweight aggregates (shale ceramsite and fly ash ceramsite) were used to prepare foamed concrete. Effects of lightweight aggregates on the compressive strength, drying shrinkage, internal humidity and pore structure of foamed concrete were studied, and the internal curing mechanism of lightweight aggregates was analyzed. Experimental results reveal that lightweight aggregates can adjust the internal humidity of foamed concrete, restrict the deformation of the matrix, and decrease the drying shrinkage of foamed concrete. However, lightweight aggregates can also introduce defects in foamed concrete, resulting in the decrease of compressive strength. The ink-bottle pores larger than 100 nm in lightweight aggregates are the control factor of efficient internal curing. The lightweight aggregates with more ink-bottle pores larger than 100 nm tend to possess stronger water release capacity and better effect of internal curing, thus resulting in lower drying shrinkage of foamed concrete.

Key words: foamed concrete, lightweight aggregate, internal curing, drying shrinkage, internal humidity, pore structure

中图分类号:

TQ178

熊远亮, 刘超, 邓智聪, 陈春, 张亚梅. 轻质骨料对泡沫混凝土性能的影响及其内养护机制[J]. 硅酸盐通报, 2022, 41(10): 3413-3419.

XIONG Yuanliang, LIU Chao, DENG Zhicong, CHEN Chun, ZHANG Yamei. Effects of Lightweight Aggregates on Properties of Foamed Concrete and Internal Curing Mechanism[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(10): 3413-3419.

参考文献

[1] HAJIMOHAMMADI A, NGO T, MENDIS P. Enhancing the strength of pre-made foams for foam concrete applications[J]. Cement and Concrete Composites, 2018, 87: 164-171.
[2] FALLIANO D, DE DOMENICO D, RICCIARDI G, et al. 3D-printable lightweight foamed concrete and comparison with classical foamed concrete in terms of fresh state properties and mechanical strength[J]. Construction and Building Materials, 2020, 254: 119271.
[3] LIU M Y J, ALENGARAM U J, JUMAAT M Z, et al. Evaluation of thermal conductivity, mechanical and transport properties of lightweight aggregate foamed geopolymer concrete[J]. Energy and Buildings, 2014, 72: 238-245.
[4] FALLIANO D, DE DOMENICO D, RICCIARDI G, et al. Compressive and flexural strength of fiber-reinforced foamed concrete: effect of fiber content, curing conditions and dry density[J]. Construction and Building Materials, 2019, 198: 479-493.
[5] NARAYANAN N, RAMAMURTHY K. Structure and properties of aerated concrete: a review[J]. Cement and Concrete Composites, 2000, 22(5): 321-329.
[6] SUN C, ZHU Y, GUO J, et al. Effects of foaming agent type on the workability, drying shrinkage, frost resistance and pore distribution of foamed concrete[J]. Construction and Building Materials, 2018, 186: 833-839.
[7] JENSEN O M, HANSEN P F. Water-entrained cement-based materials: I. Principles and theoretical background[J]. Cement and Concrete Research, 2001, 31(4): 647-654.
[8] JENSEN O M, LURA P. Techniques and materials for internal water curing of concrete[J]. Materials and Structures, 2006, 39(9): 817-825.
[9] JENSEN O M, HANSEN P F. Water-entrained cement-based materials: II. Experimental observations[J]. Cement and Concrete Research, 2002, 32(6): 973-978.
[10] ZHU Q, BARNEY C W, ERK K A. Effect of ionic crosslinking on the swelling and mechanical response of model superabsorbent polymer hydrogels for internally cured concrete[J]. Materials and Structures, 2015, 48(7): 2261-2276.
[11] JENSEN O M. Use of super absorbent polymers in concrete[J]. International Ceramics, 2013, 35: 48-52.
[12] LURA P, JENSEN O M, IGARASHI S I. Experimental observation of internal water curing of concrete[J]. Materials and Structures, 2007, 40(2): 211-220.
[13] GHOURCHIAN S, WYRZYKOWSKI M, LURA P, et al. An investigation on the use of zeolite aggregates for internal curing of concrete[J]. Construction and Building Materials, 2013, 40: 135-144.
[14] LURA P, WYRZYKOWSKI M, TANG C, et al. Internal curing with lightweight aggregate produced from biomass-derived waste[J]. Cement and Concrete Research, 2014, 59: 24-33.
[15] BENTZ D P, WEISS W J. Internal curing: a 2010 state-of-the-art review[R]. National Institute of Standards and Technology, 2011.
[16] ACI 308-213R—2013. Report on internally cured concrete using prewetted absorptive lightweight aggregate[S]. US-ACI, 2013.
[17] CASTRO J, KEISER L, GOLIAS M, et al. Absorption and desorption properties of fine lightweight aggregate for application to internally cured concrete mixtures[J]. Cement and Concrete Composites, 2011, 33(10): 1001-1008.
[18] AMRAN Y H M, FARZADNIA N, ABANG ALI A A. Properties and applications of foamed concrete: a review[J]. Construction and Building Materials, 2015, 101: 990-1005.
[19] CHINDAPRASIRT P, RATTANASAK U. Shrinkage behavior of structural foam lightweight concrete containing glycol compounds and fly ash[J]. Materials & Design, 2011, 32(2): 723-727.
[20] GENCEL O, OGUZ M, GHOLAMPOUR A, et al. Recycling waste concretes as fine aggregate and fly ash as binder in production of thermal insulating foam concretes[J]. Journal of Building Engineering, 2021, 38: 102232.
[21] RAJABIPOUR F, SANT G, WEISS J. Interactions between shrinkage reducing admixtures (SRA) and cement paste's pore solution[J]. Cement and Concrete Research, 2008, 38(5): 606-615.
[22] BABU D S. Mechanical and deformational properties, and shrinkage cracking behavior of lightweight concrete[D]. Singapore: National University of Singapore, 2009.
[23] XIONG Y L, ZHU Y, CHEN C, et al. Effect of nano-alumina modified foaming agents on properties of foamed concrete[J]. Construction and Building Materials, 2021, 267: 121045.
[24] XIONG Y L, LI B L, CHEN C, et al. Properties of foamed concrete with Ca(OH)₂ as foam stabilizer[J]. Cement and Concrete Composites, 2021, 118: 103985.
[25] XIONG Y L, ZHANG C, CHEN C, et al. Effect of superabsorbent polymer on the foam-stability of foamed concrete[J]. Cement and Concrete Composites, 2022, 127: 104398.
[26] 李琳,王宇,王晴.膨胀页岩陶粒的焙烧制度和性能的研究[J].墙材革新与建筑节能,2010(8):30-32+3.
LI L, WANG Y, WANG Q. Study on calcination system and properties of expansive shale lightweight aggregate[J]. Wall Materials Innovation & Energy Saving in Buildings, 2010(8): 30-32+3 (in Chinese).
[27] 祁会军,张慧爱,李彦岗,等.粉煤灰陶粒混凝土的研究[J].水泥工程,2022(1):26-28+62.
QI H J, ZHANG H A, LI Y G, et al. Research on fly ash ceramsite concrete[J]. Cement Engineering, 2022(1): 26-28+62 (in Chinese).
[28] 刘巽伯,李平江,计亦奇.陶粒有效弹性模量及其预估[J].混凝土,2005(3):35-38.
LIU X B, LI P J, JI Y Q. The effective elastic modulus of ceramsite and its predication[J]. Concrete, 2005(3): 35-38 (in Chinese).
[29] 苏步云.泡沫混凝土力学性能及其弹塑性损伤本构研究[D].太原:太原理工大学,2017.
SU B Y. Mechanical properties and elastoplastic damage constitutive model for foamed concrete[D]. Taiyuan: Taiyuan University of Technology, 2017 (in Chinese).
[30] KASHANI A, NGO T D, HEMACHANDRA P, et al. Effects of surface treatments of recycled tyre crumb on cement-rubber bonding in concrete composite foam[J]. Construction and Building Materials, 2018, 171: 467-473.
[31] KONG X M, ZHANG Z L, LU Z C. Effect of pre-soaked superabsorbent polymer on shrinkage of high-strength concrete[J]. Materials and Structures, 2015, 48(9): 2741-2758.
[32] GANJIAN E, KHORAMI M, MAGHSOUDI A A. Scrap-tyre-rubber replacement for aggregate and filler in concrete[J]. Construction and Building Materials, 2009, 23(5): 1828-1836.
[33] SIDDIQUE R, NAIK T R. Properties of concrete containing scrap-tire rubber: an overview[J]. Waste Management, 2004, 24(6): 563-569.