Ozeki Co., Ltd./ Compressive Strength Test Results

Bayferrox Compressive Strength Test Results

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1. Bayferrox Compressive Strength Test Results Test Method

Compressive strength tests were performed on concrete in which various pigments supplied by Lanxess were mixed.

2. Sample

The sample is a pigment for concrete coloring. The common name, colors, trade name and amount are shown in Chart 1.

Table 1 Sample

Common Name	Pigment
Appearance	Powder
Color and Trade name	Red, Bayferrox 130G
	Brown, Bayferrox 686G
	Black, Bayferrox 330G
	Yellow, Bayferrox 920G
	Green, Chrome Oxide Green GN
Amount	1.5g each

3. Materials Used

Equal amounts of three brands of regular Portland cement (Asano, Onoda and Sumitomo) were mixed. The quality test results are shown in Table 2.

Table 2 Cement Quality Test Results

Relative Density		3.15
Specific Surface Area cm²/g		3300
Setting	Standard consistency water amount	27.2
	Start time -minutes	2-34
	End time-minutes	3-53
Stability (boiling method)		Good
Flow value		248
Compressive strength Kg/cm²(N/mm²)	3 days	169（16.6）
	7 days	268（26.3）
	28 days	429（42.1）
Chemical Composition	Total alkali amount Na2O eq%	0.60
Chemical Composition	Chloride ion %	0.004

(2) River sand from the Oigawa River and sand and stone from Ome were used as the aggregate. The aggregate test results are shown in Tables 3 and 4.

Table 3 Aggregate Quality Test Results

	Fine aggregate	Rough aggregate
Name	River sand	Crushed Stone 2005A
Source	Oikawa River	Nariki, Ome-shi, Tokyo
Specific gravity in surface dry condition	2.63	2.65
Specific gravity in absolute dry condition	2.60	2.64
Absorption coefficient (%)	1.32	0.52
Weight per unit volume kg/liter	1.76	1.62
Solid volume percentage for shape determination (%)	-	60.8
Clay lump content (%)	0.2	0.1
Loss due to washing test (%)	1.0	0.4
Organic impurities	Lighter than standard color (good)	-
Stability (%)	1.9	1.8
Chloride (NaCl) (%)	0.000	-
Alkaline Silica reactivity	Non-toxic	Non-toxic
Fineness modulus	2.66	6.75

Table 4 Aggregate particle size

Sieve Nominal Dimensions mm	Passage ratio per hundred (%)
Sieve Nominal Dimensions mm	Fine aggregate	Rough aggregate
25	-	100
20	-	93
15	-	67
10	-	30
5	100	2
2.5	91	-
1.2	68	-
0.6	44	-
0.3	23	-
0.15	8	-

(3) Commercially available AE agent is used as the mixing agent and ion-exchanged water was used for kneading.

4. Test Method

A total of 6 types of concrete, including 1 type of standard concrete in which no sample is mixed, and 5 types of test concretes in which sample is mixed, are used to prepare compressive strength test samples and the compressive strengths at prescribed material ages are compared.

4.1 Concrete Blending Conditions

The preparation conditions for standard concrete are assumed to be those for concrete normally shipped by ready-mixed concrete factories with a slump of 8±2.5 cm and air volume of 4.5±1.5%. The water to cement ratio is set such that the compressive strength at age of 28 days is about 300kgf/cm². Note that the fine aggregate ratio and the amount of the AE agent used are determined by test kneading.

The blending conditions for the test concrete use the basic blending conditions for standard concrete and then the slump and air amount are adjusted by changing the unit quantity of water and the amount of AE agent that is added. The concrete type, code and basic blend are shown in Table 5.

Table 5 Concrete Type, Code and Basic Blend

Concrete type	Standard Concrete	Test Concrete
Concrete code	P	R (Red)	Br (Brown)	Bl (Black)	Y (Yellow)	G (Green)
Water-cement ratio (%)	65	65	65	65	65	65
Fine aggregate ratio (%)	47	47	47	47	46	47
Unit quantity of water kg/m³	164	164	164	164	170	164
Unit quantity of cement kg/m³	252	252	252	252	262	252
1 Amount of AE agent (%)*	0.030	0.030	0.030	0.030	0.034	0.030
* Shows comparison for cement weight

4.2 Sample Mixing Method

The sample is mixed into the cement in a proportion of 5% with respect to the cement weight.

4.3 Concrete Sample Production Methods

The concrete sample production methods are outlined in Table 6.

Table 6 Concrete Sample Production Methods

Item	Content
Material Standard and Measurement	According to JISA 1138 (method for making concrete in a laboratory) Fine aggregate with a small amount of surface water and rough granite in a surface dried state are used as the base and then surface water content correction is done.
Kneading amount and number of kneading cycles	The kneading amount for standard concrete and test concrete are 25 liters and the number of kneading cycles is one each.
Kneading time	Kneading is done for 1.5 seconds in the mortar state (cement (+sample) + fine aggregate) and then rough aggregate is poured in and kneading done for another 3.0 minutes to give a total of 4.5 minutes.
Mixer	A 50 liter forced action mixer is used.
Sequence for adding materials	50% of the fine aggregate → cement (+sample) →50% of fine aggregate → (water + AE agent) → 1.5 minutes →rough aggregate → 3.0 minutes

4.4 Method for Producing Specimen

The specimen is produced in accordance with the specimen production method for compressive strength testing specified by JISA 1132 (specimen production method for concrete strength testing).

4.5 Strength Testing Method

(1) Fresh Concrete Testing
	The slump test is performed in accordance with JISA 1101 (concrete slump test method). The measurement of air quantity and weight per unit volume are performed in accordance with JISA 1116 (test method for weight per unit volume of unhardened concrete) and JISA 1128 (test method using pressure of air quantity in fresh concrete- air chamber pressure method).
(2) Compressive Strength Test
	The compressive strength test is performed based on JISA 1108 (concrete compressive strength test method). It is to be noted that the curing method for the specimen is standard curing with sample age of 3 days, 7 days and 28 days. In addition, number of specimens is 3 each for concrete type and material age.

5. Test Results

The concrete compressive strength test results are shown in Table 7.

Table 7 Concrete Compressive Strength Test Results

Concrete type	Concrete code	Number	Compressive Strength N/mm² {kgf/cm²}			Compressive Strength Ratio (%)*
Concrete type	Concrete code	Number	3 days	7 days	28 days	3 days	7 days	28 days
Standard concrete	P	1	13.9	23.2	32.5	-	-	-
		2	13.5	22.9	33.0	-	-	-
		3	13.7	22.9	33.2	-	-	-
		Average	13.7｛140｝	23.0｛235｝	32.9｛335｝	100	100	100
Test concrete	R (red)	1	14.8	25.1	34.9	-	-	-
		2	14.7	25.4	34.4	-	-	-
		3	14.5	25.5	34.4	-	-	-
		Average	14.7｛150｝	25.3｛258｝	34.6｛353｝	107	110	105
	Br (Brown)	1	14.8	24.3	33.0	-	-	-
		2	14.3	23.9	33.9	-	-	-
		3	14.5	24.0	34.2	-	-	-
		Average	14.5｛148｝	24.1｛246｝	33.7｛344｝	106	105	102
	Bl (Black)	1	13.5	22.8	31.2	-	-	-
		2	13.7	22.6	31.4	-	-	-
		3	13.7	22.8	32.0	-	-	-
		Average	13.6｛139｝	22.7｛231｝	31.5｛321｝	99	99	96
	Y (yellow)	1	14.8	24.7	34.3	-	-	-
		2	14.7	25.0	35.5	-	-	-
		3	14.5	25.3	34.6	-	-	-
		Average	14.7｛150｝	25.0｛255｝	34.8｛355｝	107	109	106
	G (green)	1	13.9	23.0	32.6	-	-	-
		2	13.9	23.8	32.7	-	-	-
		3	14.2	22.9	32.9		-	-
		Average	14.0｛143｝	23.2｛237｝	32.7｛333｝	102	101	99
10 This shows the compressive strength ratio given that the compressive strength of standard concrete is 100.

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