Materials

DUTIES OF A MATERIAL ENGINEER Ensures that all materials comply with the schedule of mi nimum testing requirement. Advises the project engineer on the acceptance/ rejection of construction materials. Recommends remedial measures to correct unsatisfactory condition of materials. Prepare design mixes for concrete and bituminous materials. Ensures the samples are properly cured by standard procedures. Fully acquainted with standard procedures of sampling, testing and quality control of materials. To see if the laboratory is adequately equipped. Keep record of daily his activities. Submit test reports & pertinent papers. To see to it that quality of completed projects are attained as per D PWH standard. y y y y y y y y y y

TERMINOLOGIES QUALITY CONTROL PROGRAM- prepared by Materials Quality Control Division of the Regional Office and MQC Section of the District Office to be complied by the contractor. FIELD DENSITY REPORT - if pavement is being constructed concreting works are done in accordance with CONCRETE POURING PERMIT/ POURING SLIP- to ensure that all concreting the approved plans and specifications (Dept Order NO. 211 ser 2000). th MONTHLY MATERIALS REPORT- every 25 of the month. POLICIES AND ADMINISTRATIVE ISSUANCES Consultants Materials Materials Engineers DO No. 206- re-guidelines on accreditation of Contractors & Consultants

DO No. 14- adoption of D PWH Standard Specification 1995 Edition Volume 2 in the implementation of all Infrastructure Projects. DO No. 184- guidelines on accreditation of Contractors & Consultants Materials Engineers DMC No. 03  Standard Spec for Chemical Admixtures Quality Control - checking for conformance to requirements to ensure the highest quality of work. Check and regulate the use of construction material to e conomize the cost of construction. Quality Assurance- acceptance inspection

STD SPEC FOR AGGREGATES AND SOIL AGGREGATES SUBBASE, BASE AND SURFACE COURSES COARSE AGGREGATE  retain on # 10 sieves. % wear < 50 - passing # 10. FINE AGGREGATE Passing # 200 sieve ( 0.075 mm) < 2/3 of passing at # 40 sieve (0.425) SURFACE COURSE MATERIAL- minimum 8 % passing # 200 sieve. Maximum liquid limit of 35. Plasticity Index range of 2 to 9. SOIL CLASSIFICATION (AASHTO 145) GRANULAR MATERIALS - 35 % or less 0.075 mm sieve SILT CLAY MATERIALS - more than 35 % passing BINDER - passing 0.425 (#40) sieve

STONE-angular particles of rock, passes 75 mm (3) sieve and retained on 2 mm (#10) sieve. GRAVEL-rounded particles of rock w/c passes75 mm (3) sieve, retained 25.0 mm (1) sieve. SAND- granular materials , passes 2 mm (#10) sieve retained on 0.075 (#200) sieve. SILT FRACTION-passes #200 but larger than 0.002 mm CLAY FRACTION-smaller than 0.002 mm COLLOID- smaller than 0.001 mm

GROUP INDEX --measure of the relative supporting power of the subgrade soil. Greater depth is required for higher GI value.Empirical value from 0 to 20, Zero (0) GI indicates good material and GI of 20 indicates a very poor material. GI= (F  35) 0.2 + 0.005(LL-40) + 0.01 0 .01 (F  15) (PI  10) F= percentage passing 0.075 sieve expressed in positive whole number. LL= numerical Liquid Limit, pos whole number PI= numerical Plasticity Index,pos whole number Granular material to control pumping under concrete pavement: -max size not more than 1/3 the thickness of the subbase. -passing # 200 -15% max P I=

6 max LL=25 max

LIME FOR ROAD STABILIZATON - causes finely divided clay particles to agglomerate into coarser particles to improve load bearing properties Hydrated

lime- retained on #30