地聚合物混凝土配比及力学性能研究

doi:10.11872/j.issn.1005-2518.2022.02.082

Abstract

Abstract:

Concrete is an important building material in roadway support，but there are often quality problems in roadway construction，such as honeycomb surface，cracks，holes and large area damage，which need to be repaired in order not to affect the normal production.Geopolymer concrete has the characteristics of fast setting time，high early strength，strong interface bonding ability，low permeability，high temperature resistance，frost resistance，corrosion resistance，excellent durability and low energy consumption，low pollution and low cost in the preparation process，and has the potential to be used as concrete repair materials.At present，there is no consensus on the proportion design of geopolymer concrete.The fly ash and slag were activated using sodium silicate and sodium hydroxide as alkalin-activator solution for the preparation of geopolymer mortar.The effects of different alkali-activator modulus （1.0，1.2，1.4） and content （10%，15%，20%） on the mechanical properties of mortar at different ages （3 d，7 d，28 d） were studied.The results show that the modulus and content of alkali-activator have a significant effect on the mechanical properties of geopolymers.Too large or too small alkali-activator modulus and content are not conducive to the strength development of geopolymer mortar.When the ratio of fly ash to slag is 1∶1，the modulus of water glass is 1.2，the content of alkali is 15%，the flexural and compressive strength of geopolymer mortar reaches the best value.The 28 d flexural strength is 7.6 MPa，the 28 d compressive strength is 72.3 MPa.In order to further explore the mechanical properties of geopolymer concrete with different mix ratios，the orthogonal experiment with three factors and three levels was designed to study the effects of different water-binder ratio （0.45，0.50，0.55），fly ash content （30%，50%，70%） and sand ratio （30%，35%，40%） on the workability and mechanical properties of geopolymer concrete at different ages （7 d，28 d）.Taking the compressive strength as the evaluation index，the results show that fly ash content has the most significant effect on compressive strength，followed by water-binder ratio，and sand ratio has almost no effect on strength development.The results of variance analysis of 7 d and 28 d show that the content of fly ash has a highly significant effect on the compressive strength of geopolymer concrete，the water-binder ratio has a significant effect on the compressive strength of geopolymer concrete，but the sand ratio has no significant effect on the compressive strength of geopolymer concrete.Considering the workability and mechanical properties of geopolymer concrete，combined with the results of microstructure analysis，geopolymer concrete with water-binder ratio of 0.50 and fly ash content of 50% is a promising rapid repair material.

Key words: repair material, geopolymer concrete, alkali-activator modulus, alkali content, roadway support, mechanical properties

CLC Number:

TD353

Qin DING, Ming TAO, Xiang LI. Study on Proportion and Mechanical Properties of Geopolymer Concrete[J].Gold Science and Technology, 2022, 30(2): 243-253.

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成分	含量
成分	粉煤灰	矿粉
SiO₂	50.94	32.73
Al₂O₃	36.20	14.61
Fe₂O₃	3.93	0.27
CaO	3.63	36.50
TiO₂	1.36	0.68
SO₃	1.26	2.45
K₂O	1.11	0.43
MgO	0.52	7.87
Na₂O	0.41	0.28

试验编号	模数	碱掺量 /%	一锅胶砂材料用量/g
试验编号	模数	碱掺量 /%	粉煤灰	矿粉	碱激发剂	细骨料	水
1	1.0	10	225.0	225.0	90.6	1 350.0	179.4
2	1.0	15	225.0	225.0	136.0	1 350.0	156.5
3	1.0	20	225.0	225.0	181.3	1 350.0	133.7
4	1.2	10	225.0	225.0	95.7	1 350.0	174.3
5	1.2	15	225.0	225.0	143.5	1 350.0	149.0
6	1.2	20	225.0	225.0	191.3	1 350.0	123.7
7	1.4	10	225.0	225.0	100.0	1 350.0	170.0
8	1.4	15	225.0	225.0	149.9	1 350.0	142.6
9	1.4	20	225.0	225.0	199.9	1 350.0	115.1

试验编号	1 m³材料用量/kg
试验编号	粉煤灰	矿粉	粗骨料	细骨料	碱激发剂	水
1	120.0	280.0	1 232.0	528.0	127.6	112.4
2	200.0	200.0	1 131.0	609.0	127.6	132.4
3	280.0	120.0	1 032.0	688.0	127.6	152.4
4	200.0	200.0	1 056.0	704.0	127.6	112.4
5	280.0	120.0	1 218.0	522.0	127.6	132.4
6	120.0	280.0	1 118.0	602.0	127.6	152.4
7	280.0	120.0	1 144.0	616.0	127.6	112.4
8	120.0	280.0	1 044.0	696.0	127.6	132.4
9	200.0	200.0	1 204.0	516.0	127.6	152.4

试验编号	A（水胶比）	B（粉煤灰掺量）	C（砂率）	抗压强度/MPa
试验编号	A（水胶比）	B（粉煤灰掺量）	C（砂率）	7 d	28 d
1	1（0.45）	1（30%）	1（30%）	56.8	66.5
2	2（0.50）	2（50%）	2（35%）	46.1	54.7
3	3（0.55）	3（70%）	3（40%）	20.8	32.2
4	1（0.45）	2（50%）	3（40%）	47.3	63.5
5	2（0.50）	3（70%）	1（30%）	28.3	42.1
6	3（0.55）	1（30%）	2（35%）	43.5	53.4
7	1（0.45）	3（70%）	2（35%）	33.7	46.2
8	2（0.50）	1（30%）	3（40%）	52.8	65.4
9	3（0.55）	2（50%）	1（30%）	35.2	47.1

变异来源	平方和	自由度	均方	F值	F_a	显著水平
A	260.727	2	130.363	73.513	F_0.10（2，2）=9 F_0.05（2，2）=19 F_0.01（2，2）=99	*
B	848.887	2	424.443	239.348		**
C	1.680	2	0.840	0.474
误差e	3.547	2	1.773
总变异	1 114.840	8

Study on Proportion and Mechanical Properties of Geopolymer Concrete

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变异来源	平方和	自由度	均方	F值	F_a	显著水平
A	309.307	2	154.653	65.997	F_0.10（2，2）=9 F_0.05（2，2）=19 F_0.01（2，2）=99	*
B	744.687	2	372.343	158.895		**
C	0.060	2	0.0300	0.0130
误差e	4.687	2	2.3430
总变异	1 058.740	8

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