Shunan ZY Concrete Expansive Agent

concrete expansive agent is mixed with ordinary cement and hydrated,cement mortar or concrete,to minimize drying shrinkage

High Efficiency Concrete Expansion Agent with Low Alkali Content and Low Addition level ZY®

Expansive agent for concrete.Expancrete is a powder admixture used to manufacture shrinkage-compensated concrete and mortars.Expancrete is suitable for water tight castings and castings that require a contrast to concrete hygrometric shrinkage (water tanks, piping, floors, etc.).Add Expancrete to the mixer at the same time as the other ingredients (cement, aggregates,water).Expancrete is used only for reinforced concrete.one of the important achievements with patent right of China Building Material Academy (CBMA), which was awarded the second prize of National Awards of Science and Technology Progress and popularized as the key scientific payoffs and the recommended products used to construct the Xiaokang residential quarters by the Ministry of Construction. ZY is a kind of water-resisting admixture coupled with crack resisting. It has been used in thousands of water-resisting and crack-resisting engineering in countrywide and came to the top since it adopted the identification at ministry level in 1991.1) Chemical elements and alkali content Table 1. Chemical elements and alkali content:

Loss	SiO2	Al2O3	Fe2O3	CaO	MgO	SO3	K2O	Na2O
1.70	15.20	16.50	0.90	32.60	2.35	29.55	0.30	0.10

* the alkali content R2O = Na2O+0.658K2O =0.3%Table 2. The alkali content of various expansion agents:

Sorts	Alkali content(%)	Normal addition amount(%)	C=400kg/m3addition amount(kg/m3)	Alkali content from expansion agent(kg/m3)
UEA type	1.7-2.2	12	48	0.82-1.05
UEA-H	0.4-0.7	10	40	0.20-0.40
ZY	0.2-0.5	6	24	0.05-0.12

Table 3. Performance index of ZY concrete expansion agent

Item			JC476-2001 standard	Representative Value of ZY
MgO (%)			≤5.00	0.67
Water ratio (%)			≤3.00	1.54
Total alkali content (%)			≤0.75	0.32
Cl (%)			≤0.05	0.01
Fineness(Water-sieving) 0.08mmscreenresidue			≤12	7.32
Setting time	Initial (min)		≥45	2.15
	Final (h)		≤10	4.50
Limited expansion ratio (%)	In water	7d	≥0.025	0.032
		28d	≤0.10	0.045
	Air	21d	≥-0.020	-0.010
Creasing strength(MPa)	7d		≥25.0	32.4
	28d		≥45.0	52.6
Compressivestrength( MPa)	7d		≥4.5	6.8
	28d		≥6.5	8.4

Shunan ZY Concrete Expansive Agent