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Mamatov X.A., PhD Fergana Polytechnic Institute
PHYSICAL AND MECHANICAL PROPERTIES CEMENT STONE WITH CHEMICAL ADDITIVE KDj-3
Annotation. The article presents the results of studies on the use of complex chemical additives KDj-3 to improve the properties of the building mixture. Development and research of concreting technology, reducing water consumption, increasing strength in the initial period (up to 3 days) and energy-saving concretes.
Key words- cement stone, chemical additive, strength, technology, physical and mechanical properties, properties, Portland cement, efficiency, results, indicators.
The introduction of complex chemical additives into the composition of cement stone significantly changes its main properties, in particular, it increases the mobility of cement stone, accelerates its hardening in the initial stages, improves the strength, water resistance, frost resistance and other properties of cement stone [1,2]
"Uzkimyosanoat" DAK in the "Construction materials" laboratory of FarPi and the Tashkent scientific-research institute of chemical technologies. shows the efficiency of using the synthesized KDj -3 additive, studies were conducted on the optimization of the composition of cement stone with complex chemical additives [3,4]
KDj-3 complex chemical additives are used to regulate the following properties of cement stone: plasticizing the mixture in order to reduce water consumption, accelerating the hardening and setting period of cement stone (up to 3 days), very useful for the development of energy-saving technology in concrete works will come. [5,6,7]
For experimental studies, we used Portland cement of the Kuvasoysement plant, brand PC400 D20, and standard single-fraction Volsky sand GOST (61392003) fr 0-5 mm, whose fine aggregate is used to determine cement strength. Modulus Mk = 2. 2;
Experimental studies of various compositions of cement stone with 8, 10 and 12% KDj-3 added (Table 1) showed that the highest efficiency indicators were observed in the additive content of 1% [8,9]
Physical and mechanical properties of cement stone with KDj-3 were studied by preparing 2 twin samples with dimensions of 4x4x16 cm, the first control sample without additives, the second - 0. 8;1;1. 2%. The test period is 1, 3, 7, 14 and 28 days after hardening. The test results are presented in Figures 1 and 2, Tables 2 and 3 [10].
Table 1 - composition of cement stone
№ Naming composition of cement stone. mass. g
g 0,8% 1% 1,2%
1. Cement 500 500 500 500
2. Sand fr. 0-5 mm 1500 1500 1500 1500
4. Water, ml 210 205 197 192
5. KDj-3 chemical additives in relation to cement mass 0,8% - 4 - -
1% - 5 -
1,2% - - - 6
Studies have shown that with the introduction of complex chemical additive KDj-3, the density of cement stone increases by 6-9%, and also increases the strength of cement stone when it hardens. Durability is observed after 1 day. 33%; 3 days 26%; 7 days for 27%; 14 days 31% and 28 days 28%. 33% more than the design capacity of cement stone (Figure 1) [11].
Table 2 - Results of compressive strength of cement stone with complex
chemical additive KDj-3 in days_
№ Naming relative to the additional cement mass % Water, ml. % compressive strength (M 3a) in days (%),
1 3 7 14 28
1 Control sample 0 210 6,7 100 13,1 100 28,3 100 36,1 100 41,8 100
2 Additional example 0,8 -12% 8,5 118 16,9 124 31,7 112 39,8 112 47,7 116
3 Additional example 1 -16% 9,9 139 20,2 149 35,6 126 44,5 125 52,7 128
4 Additional example 1,2 -18% 9,6 133 18,9 139 34,9 122 42,5 120 50,5 121
Table 3 - Results of bending strength of cement stone with complex chemical
additive KDj-3'
№ Nomlanishi relative to the additional cement mass % Water ml. % bending strengt h (MPa) in days
1 3 7 14 28
1 Control sample 0 210 2,4 100 5,5 100 8,3 100 8,7 100 10,5 100
2 Additional example 0,8 -12% 3,3 126 6,8 119 8,8 105 9,9 112 12,7 122
3 Additional example 1 -16% 3. 5 135 7,5 129 9,7 115 11,2 126 13,6 128
4 Additional example 1,2 -18% 3. 4 132 6. 9 122 9. 3 107 10,2 114 13,1 126
Figure 1. Compressive strength of cement stone with complex chemical additive
KDj-3.
JS 60
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S3 50
»
40
« cs
CP 30
ar ITi S
» 20
CP
B 10
©
U 0
nazorat KDj-3ChMB 8% KDj-3ChMB 10%2 KDj-3ChMB 12%
7
Days
14
28
1 - Strength of cement stone without additives; 2. - 0. 8; 1 and 1. 2% KDj-3 in relation to the mass of cement. Strength of cement stone; respectively dried under normal temperature conditions.
14
M
W) 12
S3
» 10
8
« « P
ae 5 6
« 4
CP
B 2
©
U 0
nazorat
KDj-3ChMB 8% KDj-3ChMB 10% KDj-3ChMB 12%
14
28
Days
Figure 2. Bending strength of cement stone with complex chemical additive
KDj-3
Summary.
1. The development and application of multi-functional complex additive KDj-3 in cement stone in the amount of 0. 8, 1 and 1. 2% of the cement mass helps to reduce the water requirement of cement stone by 11 and 16%, respectively, and helps to increase the strength of cement stone by 25 and 30 percent. compared to control samples. Studies have shown that the density of cement stone increases by 6-9% with the introduction of KDj-3 complex chemical additive.
2. Various compositions of cement stone with added KDz-3, containing 10% of the cement mass, were studied experimentally. After studying only 1
1
3
1
3
7
composition, the use of the additive helps to reduce the water requirement of the cement stone by 10-15% and increase the strength by 25% compared to the control samples. Studies have shown that the density of cement stone increases by 6-9 percent with the introduction of KDj-3 complex chemical additive.
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Properties Of Ceramzite Concrete Based On Chemical Complex" Eurasian Journal of Engineering and Technology Volume 25| December 2023 ISSN: 27957640
12. Mirzaev B. K., Otakulov B. A., Mamatov X. A.,Abdug'aniyev N. N., Solijonov X. S. "Study of the Main Types of Scientific Research" Eurasian Journal of Engineering and Technology Volume 25| December 2023 ISSN: 27957640
13. Mirzaev B. K., Otakulov B. A., Mamatov X. A.,Abdug'aniyev N. N., Solijonov X. S. "Research Of Dispersed Reinforced Concrete " Eurasian Journal of Engineering and Technology Volume 251 December 2023 ISSN: 2795-7640
14. Mirzaev B. K., Otakulov B. A., Mamatov X. A.,Abdug'aniyev N. N., Solijonov X. S., Majidova G. A "The Effect Of Complex Chemical Additives on Foam and Its Properties" Eurasian Journal of Engineering and Technology Volume 251 December 2023 ISSN: 2795-7640
15. Mirzaev B. K., Otakulov B. A., Mamatov X. A.,Abdug'aniyev N. N., Solijonov X. S., Majidova G. A "Electron Microscopic Analysis of Modified Foam Concrete" Eurasian Journal of Engineering and Technology Volume 251 December 2023 ISSN: 2795-7640
16. Mamatov X. A. "Influence of flash ash on properties of foam concrete" "Экономика и социум" №11(114) 2023
