Preparation of High Strength Waterproof Gypsum by Modified Polyvinyl Alcohol and Portland Cement

doi:10.19894/j.issn.1000-0518.230217

Chinese Journal of Applied Chemistry ›› 2024, Vol. 41 ›› Issue (8): 1131-1145.DOI: 10.19894/j.issn.1000-0518.230217

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Preparation of High Strength Waterproof Gypsum by Modified Polyvinyl Alcohol and Portland Cement

Hai-Xiang XU¹^,²^,³, Ju-Pei XIA²()

^1.School of Public Safety and Emergency Management，Kunming University of Science and Technology，Kunming 650500，China
^2.Faculty of Chemical Engineering，Kunming University of Science and Technology，Kunming 650500，China
^3.Hubei Jianghan Construction Machinery Co. ，??? Ltd. ，Jingzhou 434000，China

Received:2023-07-30 Accepted:2024-06-17 Published:2024-08-01 Online:2024-08-27
Contact: Ju-Pei XIA
About author:xjp6661@163.com

Abstract

Abstract:

Based on desulfurized gypsum， the waterproof agent developed by modifying polyvinyl alcohol （PVA） catalyzed by liquid alkali activated Polymethyl hydrogen siloxane （PMHS） cooperated with portland cement to develop high-strength waterproof gypsum. The effects of modified PVA waterproofing agent and portland cement on the surface water absorption， mechanical properties and softening coefficient of desulfurization gypsum standard test block were investigated. The connection form of strong waterproof gypsum developed by modified hydrophobic agent and portland cement independently and cooperatively was determined by infrared spectrum. The influence of different additives on the thermal stability of gypsum was analyzed by thermogravimetry. The research shows that the best ratio of modified PVA waterproof agent and portland cement to produce high-strength waterproof gypsum is： waterproof agent 120 g and portland cement 150 g. At this time， the surface water absorption rate is 9.35%， the absolute dry compressive strength is 22.54 MPa， and the softening coefficient is 67.57%. At the same time， the thermal stability of gypsum board is effectively improved.

Key words: Liquid alkali activated methyl hydrogen-containing silicone oil, Catalytic modification, Modified polyvinyl alcohol hydrophobic agent, Thermal stability, High strength waterproof plaster

CLC Number:

O647

Hai-Xiang XU, Ju-Pei XIA. Preparation of High Strength Waterproof Gypsum by Modified Polyvinyl Alcohol and Portland Cement[J]. Chinese Journal of Applied Chemistry, 2024, 41(8): 1131-1145.

Figures/Tables 20

References 24

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Entry	m（liquid alkali activated PMHS）∶m（PVA）	m（NBDL）/g
1	1∶2	2.4
2	1∶1.5	2.4
3	1∶1	2.4
4	1.5∶1	2.4
5	2∶1	2.4

Entry	m（liquid alkali activated PMHS）∶m（PVA）	m（NBDL）/g
1	1∶2	2.4
2	1∶1.5	2.4
3	1∶1	2.4
4	1.5∶1	2.4
5	2∶1	2.4

Entry	m（desulfurized gypsum）/g	m（waterproofing agent）/g	m（deionized water）/g
1	1 000	0	600
2	1 000	10	600
3	1 000	20	600
4	1 000	40	600
5	1 000	60	600
6	1 000	80	600
7	1 000	100	600
8	1 000	120	600
9	1 000	150	600

Entry	m（desulfurized gypsum）/g	m（waterproofing agent）/g	m（deionized water）/g
1	1 000	0	600
2	1 000	10	600
3	1 000	20	600
4	1 000	40	600
5	1 000	60	600
6	1 000	80	600
7	1 000	100	600
8	1 000	120	600
9	1 000	150	600

Entry	m（desulfurized gypsum）/g	m（deionized water）/g	m（modified waterproofing agent）/g	m（portland cement）/g
1	1 000	600	100	100
2	1 000	600	100	150
3	1 000	600	100	200
4	1 000	600	120	100
5	1 000	600	120	150
6	1 000	600	120	200
7	1 000	600	140	100
8	1 000	600	140	150
9	1 000	600	140	200

Preparation of High Strength Waterproof Gypsum by Modified Polyvinyl Alcohol and Portland Cement

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Entry	m（modified waterproofing agent）/g	m（portland cement）/g	Surface water absorption/%	Absolute dry compressive strength/MPa	Soak 2 h compressive strength/MPa	Softening coefficient/%
1	100	100	15.63	18.87	12.35	65.45
2	100	150	14.24	19.32	12.67	65.58
3	100	200	14.22	19.65	12.93	65.80
4	120	100	11.58	21.17	14.03	66.27
5	120	150	9.35	22.54	15.23	67.57
6	120	200	10.03	22.39	14.67	65.52
7	140	100	13.58	20.98	13.88	66.16
8	140	150	12.85	21.07	14.01	66.49
9	140	200	12.91	21.16	13.74	63.94

Entry	m（mixed waterproofing agent）/g	m（portland cement）/g	Surface water absorption/%	Absolute dry compressive strength/MPa	Soak 2 h compressive strength/MPa	Softening coefficient/%
	100	100	5.29	3.89	2.35	60.41
2	100	150	5.73	4.42	2.67	60.40
3	100	200	6.34	5.23	2.93	56.00
4	120	100	3.48	2.73	2.03	74.36
5	120	150	4.19	3.15	2.53	80.32
6	120	200	4.81	4.39	3.67	83.59
7	140	100	2.56	2.07	1.88	90.82
8	140	150	2.94	3.16	2.01	63.61
9	140	200	3.68	3.89	2.74	70.44

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