Preparation and Properties of Expanded Vermiculite Coated Expanded Polystyrene/Cement Composite Foams†

doi:10.7503/cjcu20170654

Abstract

Abstract:

Expanded polystyrene(EPS) particles were encapsulated with epoxy resin and then with expanded vermiculite(EV) to obtain surface inorganically modified EPS(CEPS) particles. The CEPS particles were mixed with cement, water and other additives, and cured at room temperature to prepare CEPS/cement composite foams. The effects of the coating amount and CEPS content on mechanical properties and insulation performance of the composite foams were investigated, and the fire resistance of composite foam materials was also studied by cone calorimetry and butane flame spray combustion. The results show that the flexural strength, compressive strength, dry density and thermal conductivity of the composite foams increase with the increase of the coating amount. The composite foam with 1000 mL of CEPS has lower dry density and thermal conductivity, which are 269.3 kg/m³and 0.0544 W/(m·K), respectively, and the flexural strength and compressive strength of the composite foam are relatively high. The cone calorimeter test results show that the peak heat release rate, total heat release and total smoke release of the composite foams are decreased gradually with the increase of the coating amount, and the ignition time of the foams is prolonged. The results of butane flame spray combustion indicate that the fractured surface of the composite foams can be maintained intact after burning, and only the EPS beads exposed on the fractured surface of the composite foams are burned out.

Key words: Expanded polystyrene particle, Composite foam, Expanded vermiculite, Inorganic coating

CLC Number:

O631

TrendMD:

WANG Zhengzhou,YANG Ting. Preparation and Properties of Expanded Vermiculite Coated Expanded Polystyrene/Cement Composite Foams^†[J]. Chem. J. Chinese Universities, 2018, 39(5): 1098.

Figures/Tables 12

Table 1 Formulations of EPS/cement composite foams*

Sample code	Coated EPS	V(CEPS)/ mL	m(Cement)/g	m(H₂O)∶ m(Cement)	Sample code	Coated EPS	V(CEPS)/ mL	m(Cement)/g	m(H₂O)∶ m(Cement)
CEF1	CE-40	1000	200	0.45	CEF8	CE-40	1000	200	0.55
CEF2	CE-40	1000	200	0.50	CEF9	CE-40	1125	200	0.55
CEF3	CE-40	1000	200	0.55	CEF10	CE-40	1250	200	0.55
CEF4	CE-40	1000	200	0.60	CEF11	CE-30	1000	200	0.55
CEF5	CE-40	1000	200	0.65	CEF12	CE-40	1000	200	0.55
CEF6	CE-40	750	200	0.55	CEF13	CE-50	1000	200	0.55
CEF7	CE-40	875	200	0.55	CEF14	CE-60	1000	200	0.55

Fig.1 Effect of H2O-cement ratio on flexural and compressive strengths of composite foams

Fig.2 Effect of H2O-cement ratio on dry density and thermal conductivity of composite foams

Fig.3 Effect of CEPS content on flexural and compressive strengths of composite foams

Fig.4 Effect of CEPS content on dry density and thermal conductivity of composite foams

Fig.5 Effect of CEPS with different coating amounts of expanded vermiculite on flexural and compressive strengths of composite foams

Fig.6 Effect of CEPS with different coating amounts of expanded vermiculite on dry density and thermal conductivity of composite foams

Fig.7 HRR curve of the composite foams Note:a. CEF11; b. CEF12; c. CEF13; d. CEF14.

Table 2 CCT results of the composite foams

Sample code	TTI/s	PHRR/(kW·m^-2)	THR/(MJ·m^-2)	TSR/(m²·m^-2)
CEF11	23	78	11.0	33.1
CEF12	51	62	8.1	24.7
CEF13	85	59	7.8	20.6
CEF14	90	57	5.7	8.7

Fig.8 TSR curve of the composite foams Note: a. CEF11; b. CEF12; c. CEF13; d. CEF14.

Fig.9 Pictures of residues of the composite foams after burning Note:A) CEF11; (B) CEF12; (C) CEF13; (D) CEF14.

Fig.10 Photos of fractured surfaces of the composite foams before(A—D) and after(E—H) the spray flame burning Note:(A, E) CEF11; (B, F) CEF12; (C, G) CEF13; (D, H) CEF14.

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