WSP01505

• File Number: 8220.200.05.J
• Description: Hoover Dam/Lake Mead/Boulder Canyon Project
• Basin: Colorado Mainstem
• Date: 1/1/1949
• Author: USDOI/BOR
• Title: Boulder Canyon Project Final Reports: Part VII/ Bulletin 4 - Mass Concrete Investigations
• Water Supply Pro - Doc Type: Report/Study

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CONTENTS

PREP ARA TION OF SPECIMENS
Section Page
89 Casting specimens_ ____u__ __u____ ______ ____ _____u__________ 112
90 Compaction methodsn___ _______ _ ______ __________n__ _________ 112
91 Finishing and curing_u_uuuu_uu____uuuu__u__uu_u 113
92 Cleaning joint surfaces_.__ __________ __ __ ___ _ __ _ ___ __h_________ 113
93 Mortar in jointsu____________________________________________ 114
94 Other joint conditions__Uh_h_uhun__nn_n____n_____h_ 114

TESTS FOR JOINT EFFICIENCY

95 Flexure tests__ __________________ _____________________________ 114
96 Permeability tests_ hh_h_ hn ____h_ n_____nu_hh_ __ _h_ _ 115
97 Other tests_ n_uuu__uuuu_uuuuuu_uu_nu_nnn 115

TEST RESULTS

98 <leneral_____________________________________________________ 115
99 Effect of ioints____nu__uuu_n_unuuuuu___n__u_u_ 119
100 Effect of a mortar layer in the jointn_nn_h___n_u_u_u___n 119
101 Effect of method of joint cleaning~_____uunuunu_n_nnn 121
102 Effect of age at time of joint cleaning_n_u_u_nnn____u__n_ 122
103 Effect of time between liftsu___unu_____nnn_nunnuu_ 123
104 Effect of method of concrete compaction__n__u_nunuuu_u 123
105 Effect of mix proportions__n_unun___hnn_unuunuu_ 123
106 Effect of drying periodsu_nu___nu_______n__nnn_nnu_ 127
107 Other relationships_ _ _ _ n__ u ______________ __ __ __h__ _________ 127
108 Conclusions___________ ______ __n____h_n_____ __ ____ _________ 127
109 Methods used on Hoover Damnunu_____nun_unn__u_u 128

CHAPTER V-INVESTIGATIONS CONDUCTED TO
STANDARDIZE EQUIPMENT AND PROCEDURES

110 Generw_____________________________________________________ 131

PREUMINARY CEMENT tNVESTIGATION

111 Purpose of investigation__uun___n_un__uu_______uuuu 131
112 Cements_____________________________________________________ 131
113 1'ests_______________________________________________________ 131
114 1'est resultsun__u_nu__nnu__nnun__nn___nu__nu 132
115 Cheek tests of the chosen cement_uh_nn_h__hUUUU__U__ 136

METHODS OF COMPACTION

116 Requirementu______n____uu ______ ______u__._______________ 141
117 1'ests_______________________________________________________ 141
118 Vibrators_____________________________________~______________ 141
119 Materials and mixes___uunnun__u__nU__nh_h_U_h__ 142
120 Strength results_nun_nnnuuu___nnun_nu__u____n 147
121 Physicwproperties_uu_nnuu_n_n_n_nn_nun__nnu 150
122 Harshrnixes_________________________________________________ 151
123 1'heory______________________________________________________ 151
124 Conclusions_u_ __ u_ _ ___ u ___ _ __ __n _ u u_ u_ ___h_____n _ u_ 155
125 Adopted method_____________________________________________ 155