Properties and Microstructure of PS⁃g⁃PBA Emulsion⁃modified Cement Mortars

doi:10.19491/j.issn.1001-9278.2021.02.005

Abstract

Abstract:

In this paper， a type of polystyrene?grafted poly（butyl acrylate）（PS-g-PBA） emulsion was synthesized and then used to modify cement mortars. The effects of mass ratios of PS to PBA and polymer to cement on the fluidity， water reduction effect， mechanical properties and capillary water absorption rate of PS-g-PBA emulsion-modified cement mortars were investigated. The results show that the water reduction effect of the three cement modifiers is excellent， and the maximum value of water reduction rate is 56.7 %. The water absorption rate of the pores of the modified cement mortar decreases obviously， and its minimum value is 0.288 kg/m².PS-g-PBA emulsion also has an important effect on the mechanical properties of modified cement mortar.The compressive strength is generally reduced， and the flexural strength of partially modified mortar is increased， and its maximum value is 8.1 MPa.The PS-g-PBA cement modifiers developed by this work are suitable for use in the modification of cement mortars.

Key words: polystyrene-grafted poly（butyl acrylate） emulsion, modification, cement mortar, property, microstructure

CLC Number:

TQ325.2

XIONG Huixia, ZHAO Wenjie. Properties and Microstructure of PS⁃g⁃PBA Emulsion⁃modified Cement Mortars[J]. China Plastics, 2021, 35(2): 29-33.

Figures/Tables 9

样品名称	水对水泥的质量比	流动度/mm
普通水泥砂浆	0.560	174
1^#?5.0	0.418	177
1^#?10.0	0.301	173
1^#?15.0	0.270	176
1^#?20.0	0.263	174
2^#?5.0	0.400	177
2^#?10.0	0.320	175
2^#?15.0	0.270	170
2^#?20.0	0.255	179
3^#?5.0	0.390	180
3^#?10.0	0.320	179
3^#?15.0	0.275	174
3^#?20.0	0.250	178

Tab.1. Flow properties of PS?g?PBA cement modifier modified cement mortars

Fig.1. FTIR of PS and PS?g?PBA

Fig.2. Water reduction rate against content of modifier

Fig.3. Absorbed water of modifier mortars against time1/2

Fig.4. Absorbed water of modifier mortars against time1/2

Fig.5. Compressive strength of modified mortars against modifier content

Fig.6. Flexural strength of modified mortars against modifier content

Fig.7. SEM of holes in modified cement mortar

Fig.8. SEM of latex film of modified cement mortar

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