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28-2.02B Cementitious Material

28-2.02 MATERIALS

28-2.02A General

You may use a water-reducing chemical admixture. Water-reducing chemical admixture must comply with ASTM C494, Type A or Type F.

The air content in LCB must not exceed 4 percent. If the aggregate used for LCB is produced from processed reclaimed asphalt concrete or other material that may cause the air content to exceed 4 percent, reduce the air content with an admixture.

Portland cement content in LCB must not exceed 300 lb/cu yd.

LCB must comply with the requirements shown in the following table:

LCB Requirements
Quality characteristic	Test method	Requirement
Sand equivalent (min)	ASTM D2419	18
Aggregate gradation	ASTM C136	Note a
Air content (max, percent)^b	ASTM C231	4
Penetration (inches)	ASTM C360	0 to 1-1/2 nominal^c
Slump (inches)	ASTM C143	0–3 nominal^c
Compressive strength (min, psi at 7 days)	ASTM C39	530
Compressive strength (max, psi at 3 days)^d	ASTM C39	500
^aComply with the table titled "Aggregate Gradation" in section 28-2.02C. ^bIf no single test in the first 5 air content tests exceeds 1-1/2 percent, no further air content tests are required. ^cMaximum penetration must not exceed 2 inches and maximum slump must not exceed 4 inches ^dOnly applicable if you (1) submitted a notice stating intent to produce LCB qualifying for a transverse contraction joint waiver and (2) successfully field qualified the LCB for 3-day compressive strength.

28-2.02B Cementitious Material

SCM must comply with section 90-1.02B except the equations for SCM content under section 90-1.02B(3) do not apply.

For aggregate qualification testing, use Type II portland cement under section 90-1.02B(2) without SCM.

28-2.02C Aggregate

Use either 1-1/2 inch or 1 inch gradation. Do not change your selected aggregate gradation without authorization.

When tested under ASTM C136, the aggregate gradation must be within the percentage passing limits for the sieve sizes shown in the following table:

Aggregate Gradation
Sieve size	Percentage passing
	1-1/2" maximum		1" maximum
	Operating range	Contract compliance	Operating range	Contract compliance
2"	100	100	--	--
1-1/2"	90100	87100	100	100
1"	--	--	90100	87100
3/4"	5085	4590	50100	45100
3/8"	4075	3580	4075	3580
No. 4	2560	2065	3560	3065
No. 30	1030	634	1030	634
No. 200	012	015	012	015

Aggregate must comply with the quality requirements shown in the following table:

Aggregate Quality
Quality characteristic	Test method	Operating range	Contract compliance
Sand equivalent (min)	ASTM D2419	21	18
Compressive strength (min, psi at 7 days)	ASTM C192 ASTM C39	--	610 at 300 lb/cu yd cement content
NOTE: Cement must comply with the specifications for Type II portland cement in section 90-1.02B(2).

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