Article
Biochemistry & Molecular Biology
Yongcheng Ji, Qijun Sun
Summary: The addition of CMC enhances the stability of foam, reduces the dry density of foam concrete, improves water absorption, and compressive strength, thereby enhancing the pore structure of foam concrete.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Construction & Building Technology
Yuanliang Xiong, Chao Zhang, Chun Chen, Yamei Zhang
Summary: This study investigated the application of crosslinked poly sodium acrylate superabsorbent polymer (SAP) in improving the properties of foamed concrete. It was found that the addition of SAP can increase the yield stress of cement paste and the stability of foamed concrete.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Siyao Guo, Wenrui Wang, Zhiqing Jia, Xiaoqiang Qi, Haiyu Zhu, Xiangyu Liu
Summary: A novel ultrastable aqueous foam with controllable structure and Plateau borders was synthesized by adding PVA and NA complexes to SDS. The addition of PVA and NA effectively stabilized the foam and improved the mechanical properties and durability of foamed concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Yi Xu, Songru Tong, Xu Xu, Juntao Mao, Xuan Kang, Jie Luo, Linhua Jiang, Ming-Zhi Guo
Summary: This study aimed to investigate the impact of mixing expanded polystyrene (EPS) particles on foamed concrete. By comparing the modified EPS foamed concrete with ordinary foamed concrete, the influence of EPS particle dosage and size on the mechanical properties and thermal conductivity was analyzed. The pore structures of the two types of foamed concrete were characterized and compared using SEM, MIP, and IPP. The results showed that replacing 60% foam with large and small EPS particles led to lower water absorption and increased compressive strength. The thermal conductivity of the EPS modified foamed concrete was similar to/even slightly lower than that of the ordinary foamed concrete. The addition of EPS in foamed concrete increased the proportion of small connected pores and reduced the proportion of medium and large pores, effectively improving the stability.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Materials Science, Ceramics
Jinyan Shi, Yuanchun Liu, Huijie Xu, Yiming Peng, Qiang Yuan, Julong Gao
Summary: This study investigates the control of stability in lightweight chemical foaming mixtures and prepares ultra-lightweight foamed geopolymer concrete by replacing part of fly ash with cenospheres. The results show that increasing the substitution ratio of cenospheres helps in generating smaller initial bubbles but adversely affects the long-term stability of the bubbles. The mixture with 50% cenospheres exhibits the best stability and hardened pore structure.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Jinchi Han, Farnaz Niroui, Jeffrey H. Lang, Vladimir Bulovic
Summary: The absence of a versatile, scalable, and defect-free bottom-up assembly of nanoparticles has been a challenge for the large-scale integration of nanoparticle-based devices. In this study, we propose a self-limiting dielectrophoretic approach that can precisely align nanoparticles onto electrodes over a large area. Experimental results show a 70% yield of single-nanowire assembly, and factors limiting the current yield are discussed. Improving nanoparticle-electrode contact and reducing capillary force during the drying process are expected to further increase the yield. The approach also demonstrates versatility for scalable and site-selective alignment of various nanoparticles.
Article
Construction & Building Technology
Xiong Yuanliang, Li Baoliang, Chen Chun, Zhang Yamei
Summary: In this study, Ca(OH)(2) was used as a foam stabilizer to improve the stability of fresh foam and enhance the properties of foamed concrete. The inclusion of Ca(OH)(2) can hinder the disproportionation and coalescence of bubbles by reacting with alumina on the bubble surface, thus improving foam stability and achieving a finer, more homogeneous pore structure for better performance of foamed concrete.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Chemistry, Physical
Hao Liu, Cong Shen, Jixin Li, Gaoke Zhang, Yongsheng Wang, Huiwen Wan
Summary: This paper investigates the effects of foam density, foaming agent types, and slurry on the pore structure and mechanical properties of foamed lightweight soils (FLSs). The results indicate that a foam density of 50 kg/m3 is the most stable in the air and the stability of foam in slurry is not directly related to its property in the air. Among the three foaming agents, Type-S shows the best stability in cement slurry. The FLS prepared with a density of 50 kg/m3 using Type-S foaming agent exhibits the smallest average pore size and the highest compressive strength.
Article
Construction & Building Technology
Alireza Bagheri, Gholamreza Ghahremani
Summary: Foamed concrete, a lightweight material, has been extensively researched in recent years. Different researchers have proposed strength prediction models based on material porosity, but these models yield significantly different strength values for the same foam porosity. The same situation applies to the prediction of elastic modulus. Through experimental studies and re-examination of previous works, researchers have derived a general expression to quantify the effect of foam content on the strength of foamed concrete. They have also resolved the discrepancy in power exponents reported by various researchers.
MAGAZINE OF CONCRETE RESEARCH
(2022)
Article
Chemistry, Physical
Yuansheng Wei, Xiaoqiang Cao, Gang Wang, Mingguang Zhang, Zhiwen Lv
Summary: Using cement, solid waste base material, and 30% hydrogen peroxide, foamed concrete materials were made through chemical foaming, and XRD, BET, SEM, and thermogravimetric techniques were used to investigate the adsorption of carbon dioxide. The study found that the hydration products of cementified materials, including C-S-H, Ht, and Ca(OH)2, play a significant role in CO2 storage. The optimal ratios for foamed concrete materials were a water-cement ratio of 0.7 and a foaming agent dosage of 10%. The maximum carbon dioxide sealing capacity of foamed concrete material was 66.35 kg/m³.
Article
Construction & Building Technology
Weipeng Feng, Yu Jin, Dapeng Zheng, Yuan Fang, Zhijun Dong, Hongzhi Cui
Summary: This study investigates the role of triethanolamine (TEA) in regulating the early strength of ultra-lightweight fly ash-based chemically foamed geopolymer. The results show that TEA can regulate the early strength of the geopolymer foam by controlling the pore sizes and distributions, even when the geopolymerization process is slowed down. Additionally, the use of TEA reduces the compressive strength of the skeleton but significantly increases the specific strength of the geopolymer foam.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Engineering, Chemical
Guanglei Zhang, Sajjad Foroughi, Branko Bijeljic, Martin J. J. Blunt
Summary: Traditionally, relative permeability is calculated assuming a homogenous saturation profile and constant capillary pressure, but this is seldom accurate due to inhomogeneities and the capillary end effect. We have introduced a new method to correct the relative permeabilities for an inhomogeneous saturation profile. Our method only requires pressure drop measurements, an estimate of capillary pressure, and saturation profiles. The corrections are significant for strongly wetting media with capillary end effects, but less significant for mixed-wet media with lower capillary pressure.
TRANSPORT IN POROUS MEDIA
(2023)
Article
Energy & Fuels
Motaz Taha, Pramod Patil, Quoc P. Nguyen
Summary: Foam is an effective method for conformance control in enhanced oil recovery. This study investigates the impact of pore properties on foam rheology in carbonate rocks. The results show that pore structure significantly affects the rheological behavior of foam and its transient behavior. Understanding the rock pore structure is crucial for successful foam implementation in carbonate reservoirs.
Article
Materials Science, Ceramics
Zhenyou Ma, Jinyan Zeng, Songzhu Chu, Wenying Zhou, Yuandong Mu, Guotian Ye
Summary: Calcium aluminate cement (CAC) was used as a novel binder in foam slurries for preparing Al2O3 foamed ceramics. Different foam stabilizers, including modified polyethoxylated silicone (MPS), sodium alginate (SA), and carboxymethyl cellulose (CMC), were selected to investigate their effects on the setting behavior of CAC-containing foam slurries, as well as the pore size and heat-insulating property of the resulting foamed ceramics. It was found that SA promotes the hydration of CAC, while MPS and CMC delay it, and foamed ceramics with SA exhibit better structural integrity, higher porosity, smaller average pore size, and lower thermal conductivity compared to those with MPS or CMC.
CERAMICS INTERNATIONAL
(2023)
Article
Construction & Building Technology
Jingsong Shan, Yuan Zhang, Shuyin Wu, Zhansheng Lin, Lei Li, Qiulin Wu
Summary: This study establishes a three-dimensional pore model to analyze the pore characteristics and spatial structure of pervious concrete. The results show a linear relationship between pore characteristics and permeability attributes, and an increase in porosity enhances the permeability and connectivity between pores.
CONSTRUCTION AND BUILDING MATERIALS
(2022)