硅灰、偏高岭土对矿渣-粉煤灰微珠胶凝材料性能的影响

doi:10.19964/j.issn.1006-4990.2021-0529

Abstract

Abstract:

Firstly，the optimum ratio of slag?fly ash microbead cementitious material matrix meeting the requirements of rapid repair was determined by changing the content of fly ash microbead，and then the content of metakaolin and silica fume was adjusted to study its influence on the setting time，mechanical properties and hydration mechanism of composite cementitious materials.It was found that metakaolin was more sensitive to the change of setting time than silica fume.The influence of different silica fume and metakaolin content on the hydration reaction degree of slag?fly ash microbead cementitious material was analyzed by chemical bound water test.The mechanical test results showed that the compressive strength of the test block was 11.5 MPa in 2 h and 75.2 MPa in 28 days with the composite of slag?fly ash microbead cementitious matrix and 5% silica fume（mass fraction）+15% metakaolin（mass fraction）.

Key words: silica fume, metakaolin, hydration mechanism, setting time, compressive strength

CLC Number:

TU528

LIU Yingqiang,GUO Runhua,LIU Xijie. Influence of silica fume and metakaolin on properties of slag?fly ash microbead cementitious materials[J]. Inorganic Chemicals Industry, 2022, 54(6): 102-108.

Figures/Tables 11

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原料	化学成分质量分数/%
原料	CaO	SiO₂	Al₂O₃	SO₃	Fe₂O₃	MgO	K₂O	TiO₂	C
偏高岭土	<0.1	54.5	43.5	—	0.81	<0.05	<0.5	1.0	—
矿渣	34.0	34.5	17.7	1.64	1.03	6.01	—	—	—
粉煤灰微珠	0.4	57.6	30.5	—	0.60	1.50	2.25	1.25	1.40
硅灰	0.023	98.1	0.22	—	0.015	0.011	0.056	0.013	—

编号	m（矿渣）/g	m（粉煤灰微珠）/g	m（偏高岭土）/g	m（硅灰）/g	m（水）/ g	m（水玻璃）/g	m（氢氧化钠）/g
GA0	990.0	110.0	0	0	367	129.9	85.2
MK1	940.5	104.5	55	0	367	129.9	85.2
MK2	836.0	209.0	110	0	367	129.9	85.2
MK3	731.5	313.5	165	0	367	129.9	85.2
GH1	940.5	104.5	0	55	367	129.9	85.2
GH2	836.0	209.0	0	110	367	129.9	85.2
GH3	731.5	313.5	0	165	367	129.9	85.2
GF1	891.0	99.0	55	55	367	129.9	85.2
GF2	841.5	93.5	110	55	367	129.9	85.2
GF3	792.0	88.0	165	55	367	129.9	85.2

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Influence of silica fume and metakaolin on properties of slag?fly ash microbead cementitious materials

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