Damage and microscopic analysis of steam⁃cured EPS particle⁃filled concrete based on random aggregate model

doi:10.19491/j.issn.1001-9278.2024.07.013

Abstract

Abstract:

To study the mechanism of thermal damage of concrete caused by steam when mixed with waste plastics， the compressive strength tests of concrete with different contents of polystyrene foam （EPS） particles were carried out， and the effect of EPS⁃particle incorporation on the porous structure characteristics and microscopic evolution of steam⁃cured specimens was revealed through mercury intrusion test and SEM observation. The results indicated that the strength of steam⁃cured specimens increased slightly with an increase in the EPS content. The introduction of EPS particles is beneficial for the development of the later strength of the steam⁃cured concrete. The thermal stress caused by steam curing was significantly alleviated， and the number of micro cracks and through cracks decreased， effectively suppressing the thermal damage caused by steam curing. The presence of EPS particles refined the pore structure of the steam⁃cured concrete and reduced the crack width on the interface of the EPS particle and cement matrix.

Key words: polystyrene foam granular concrete, steam curing damage, random aggregate model, pore structure

CLC Number:

TQ325.2

YANG Rui, GUO Yang, ZHOU Jinyou. Damage and microscopic analysis of steam⁃cured EPS particle⁃filled concrete based on random aggregate model[J]. China Plastics, 2024, 38(7): 74-78.

Figures/Tables 12

SiO₂含量

Al₂O₃

含量

Fe₂O₃

含量

CaO含量

MgO

含量

Tab.1. Chemical components of cement

水

含量

纤维

含量

金属

含量

其他成分

含量

Tab.2. Mass percentage of each component of EPS powder

试件	水泥	水	石子	砂	EPS颗粒
EC0	520	195	810	835	0
EC30				747	30
EC60				696	60
EC90				571	90

Tab.3. Mix proportions of EPS particle concrete

Fig.1. Steam curing system

Fig.2. Random aggregate model for EPS concrete

水灰比	弹性模量/GPa	泊松比	压缩强度/MPa	拉伸强度/MPa
0.375	24	0.20	46.2	3.71

Tab.4. Calculation parameters of concrete matrix

Fig.3. Comparison of simulated and experimental results of compressive strength of EPS particles concrete

Fig.4. Cloud chart of thermal damage in concrete with different dosages of EPS particles

Fig.5. Proportion of concrete damage units with different dosages of EPS particles

Fig.6. Distribution curve of concrete pore size

EPS颗粒掺量

/kg·m^-3

Tab.5. Porosity and median pore size of EPS concrete

Fig.7. SEM of the interface transition zone of EPS granular concrete under different curing systems

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